WO2010114253A2 - Novel organic electroluminescent compounds and organic electroluminescent device using the same - Google Patents

Novel organic electroluminescent compounds and organic electroluminescent device using the same Download PDF

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WO2010114253A2
WO2010114253A2 PCT/KR2010/001813 KR2010001813W WO2010114253A2 WO 2010114253 A2 WO2010114253 A2 WO 2010114253A2 KR 2010001813 W KR2010001813 W KR 2010001813W WO 2010114253 A2 WO2010114253 A2 WO 2010114253A2
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organic electroluminescent
alkyl
fused
aryl
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WO2010114253A3 (en
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Young Gil Kim
Hyo Jung Lee
Young Jun Cho
Hyuck Joo Kwon
Bong Ok Kim
Sung Min Kim
Seung Soo Yoon
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Dow Advanced Display Materials Ltd
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Priority to CN2010800250539A priority patent/CN102449110A/en
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Publication of WO2010114253A3 publication Critical patent/WO2010114253A3/en
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Definitions

  • the present invention relates to novel organic electroluminescent compounds and organic electroluminescent devices employing the same. Specifically, it relates to novel anthracene derivatives having electroluminescent properties, and organic electroluminescent devices employing the same as electroluminescent material.
  • electroluminescence (EL) devices being self-luminous type display devices, have advantages of wide visual angle, excellent contrast as well as rapid response rate.
  • Eastman Kodak firstly developed an organic EL device employing low molecular aromatic diamine and aluminum complex as a substance for forming an electroluminescent layer, in 1987 [Appl. Phys. Lett. 51, 913, 1987].
  • An organic EL device is a device wherein, when charge is applied to an organic film formed between an electron injection electrode (cathode) and a hole injection electrode (anode), an electron and a hole form a pair and then become extinct with emitting light.
  • a device can be formed on a transparent flexible substrate such as plastics. The device can be operated at a lower voltage (not more than 10 V) with relatively lower power consumption but excellent color purity, as compared to a plasma display panel or an inorganic EL display. Since the organic electroluminescent (EL) devices can develop three colors (green, blue and red), they have been focused for full colored display devices for next generation.
  • electroluminescent material The most important factor to determine luminous efficiency, lifetime or the like in an organic EL device is electroluminescent material.
  • electroluminescent materials include that the material should have high luminescent quantum yield in solid state and high mobility of electrons and holes, is not easily decomposed during vapor-deposition in vacuum, and forms uniform and stable thin film.
  • An organic EL device is composed of anode/HIL/HTL/EML/ETL/EIL/cathode.
  • the color of the light emitted (blue, green, red) from the organic electroluminescent device can be realized depending on how the electroluminescent layer (EML) is formed.
  • the electroluminescent materials are classified into host materials and dopant materials from the aspect of their functions. It is generally known that a device structure having the most excellent EL properties can be fabricated with an EL layer prepared by doping a dopant to a host. Recently, development of organic EL devices with high efficiency and long life comes to the fore as an urgent subject, and particularly urgent is development of a material with far better EL properties as compared to conventional EL materials as considering EL properties required for a medium to large sized OLED panel.
  • a green fluorescent material As a green fluorescent material, a system wherein a coumarine derivative (Compound d, C545T), a quinacridone derivative (Compound e), DPT (Compound f) or the like is doped to Alq (a host), as a dopant, in a concentration from several % to not more than 20 % has been developed and widely used.
  • the conventional electroluminescent materials suffer from significant problem in view of lifetime with noticeable reduction of initial efficiency, though they show good performance in view of initial luminous efficiency at the level of practical use.
  • the materials have limitations to be employed for a high performance panel of larger screen.
  • the object of the invention is to overcome the problems described above, and to provide organic electroluminescent compounds comprising an excellent backbone to obtain better luminous efficiency, device life and appropriate color coordinate, as compared to conventional host materials.
  • Another object of the invention is to provide organic electroluminescent devices of high efficiency and long life by employing those organic electroluminescent compounds as electroluminescent material.
  • novel organic electroluminescent compounds were prepared according to the invention.
  • Those compounds can be employed as electroluminescent material for an organic electroluminescent device, particularly as electroluminescent host, preferably green host.
  • the compounds according to the invention provides organic electroluminescent devices with enhanced efficiency, lowered operation voltage and improved stability.
  • the present invention provides organic electroluminescent compounds represented by Chemical Formula (1):
  • L 1 and L 2 independently represent a chemical bond, (C6-C30)arylene with or without substituent(s), (C3-C30)heteroarylene with or without substituent(s), 5- to 7-membered heterocycloalkylene with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkylene fused with one or more aromatic ring(s), (C3-C30)cycloalkylene with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkylene fused with one or more aromatic ring(s), adamantylene with or without substituent(s), (C7-C30)bicycloalkylene with or without substituent(s), (C2-C30)alkenylene with or without substituent(s), (C2-C30)alkynylene with or without substituent(s), (C6-C30)ar(C1-C30)alkylene with or without substituent(s
  • R 1 through R 4 and Ar 1 independently represent hydrogen, deuterium, halogen, (C1-C30)alkyl with or without substituent(s), (C6-C30) aryl with or without substituent(s), substituted or unsubstituted (C6-C30)aryl fused with one or more (C3-C30)cycloalkyl(s) with or without substituent(s), (C3-C30)heteroaryl with or without substituent(s), 5- to 7-membered heterocycloalkyl with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkyl fused with one or more aromatic ring(s), (C3-C30)cycloalkyl with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkyl fused with one or more aromatic ring(s), adamantyl with or without substituent(s), (C7-C30)bicy
  • n an integer 1 or 2.
  • alkyl and other substituents containing ‘alkyl’ moiety described herein include both linear and branched species.
  • aryl represents an organic radical derived from aromatic hydrocarbon by deleting one hydrogen atom therefrom.
  • An aryl group may be a monocyclic or a fused ring system, each ring of which suitably contains from 4 to 7, preferably from 5 or 6 cyclic atoms. Structures wherein two or more aryl groups are combined through single bond(s) are also included. Specific examples include phenyl, naphthyl, biphenyl, anthryl, indenyl, fluorenyl, phenanthryl, triphenylenyl, pyrenyl, perylenyl, chrysenyl, naphtacenyl, fluoranthenyl and the like, but are not restricted thereto.
  • the naphthyl may be 1-naphthyl or 2-naphthyl
  • the anthryl may be 1-anthryl, 2-anthryl or 9-anthryl
  • the fluorenyl may be any one of 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl and 9-fluorenyl.
  • the heteroaryl may be a 5- or 6-membered monocyclic heteroaryl or a polycyclic heteroaryl which is fused with one or more benzene ring(s), and may be partially saturated.
  • the structures having one or more heteroaryl group(s) bonded through a single bond are also included.
  • the heteroaryl groups may include divalent aryl groups of which the heteroatoms are oxidized or quarternized to form N-oxides, quaternary salts, or the like.
  • Specific examples include monocyclic heteroaryl groups such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl; polycyclic heteroaryl groups such as benzofuranyl, benzothiophenyl, isobenzofuranyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazo
  • the alkyl groups in ‘C1-C30)alkyl, tri(C1-C30)alkylsilyl, di(C1-C30)alkyl(C6-C30)arylsilyl, (C6-C30)ar(C1-C30)alkyl, (C1-C30)alkyloxy, (C1-C30)alkylthio, (C1-C30)alkyloxycarbonyl, (C1-C30)alkylcarbonyl, (C1-C30)alkyloxycarbonyloxy, (C1-C30)alkylcarbonyloxy’ described in the present specification may have restricted carbon number from 1 to 20, or from 1 to 10.
  • the aryl groups in ‘(C6-C30)aryl, di(C1-C30)alkyl(C6-C30)arylsilyl, tri(C6-C30)arylsilyl, (C6-C30)ar(C1-C30)alkyl, (C6-C30)aryloxy, (C6-C30)arylthio, (C6-C30)arylcarbonyl, (C6-C30)aryloxycarbonyl, (C6-C30)arylcarbonyloxy or (C6-C30)aryloxycarbonyloxy’ may have restricted carbon number from 6 to 20, or from 6 to 12.
  • the heteroaryl groups in ‘(C3-C30)heteroaryl’ may have restricted carbon number from 4 to 20, or from 4 to 12.
  • the cycloalkyl groups in ‘(C3-C30)cycloalkyl’ may have restricted carbon number from 3 to 20, or from 3 to 7.
  • the alkenyl or alkynyl of ‘(C2-C30)alkenyl or alkynyl’ may have restricted carbon number from 2 to 20, or from 2 to 10.
  • L 1 and L 2 are independently selected from a chemical bond; arylene groups such as phenylene, naphthylene, anthracenylene, biphenylene, fluorenylene, triphenylenylene, fluoranthenylene, chrysenylene, terphenylene, phenanthrylene, pyrenylene and perylenylene; and heteroarylene groups such as pyridinylene, pyrazinylene, furylene, thienylene, selenophenylene, quinolinylene, quinoxalinylene, phenanthrolinylene, but they are not restricted thereto. Those groups may be further substituted as described for Chemical Formula (1).
  • R 51 through R 58 independently represent substituted or unsubstituted (C1-C30)alkyl, substituted or unsubstituted (C6-C30)aryl, or substituted or unsubstituted (C3-C30)heteroaryl, or each of them may be linked to an adjacent substituent via (C3-C30)alkylene or (C3-C30)alkenylene with or without a fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring.
  • organic electroluminescent compounds according to the present invention can be more specifically exemplified by the following compounds, but they are not restricted thereto.
  • R 1 through R 4 , L 1 , L 2 and Ar 1 are defined as for Chemical Formula (1).
  • the present invention also provides an organic electroluminescent device which is comprised of a first electrode; a second electrode; and at least one organic layer(s) interposed between the first electrode and the second electrode; wherein the organic layer comprises one or more organic electroluminescent compound(s) represented by Chemical Formula (1).
  • the organic electroluminescent compound is employed as host material of the electroluminescent layer.
  • the organic electroluminescent device according to the present invention is characterized in that the organic layer comprises an electroluminescent layer containing one or more organic electroluminescent compound(s) represented by Chemical Formula (1), as well as one or more dopant(s).
  • the dopant to be applied to an organic electroluminescent device according to the invention is not particularly restricted, but preferably selected from the compounds represented by Chemical Formula (2) or (3):
  • L represents (C6-C30)arylene with or without substituent(s), (C3-C30)heteroarylene with or without substituent(s);
  • the electroluminescent layer means the layer where electroluminescence occurs, and it may be a single layer or a multi-layer consisting of two or more layers laminated.
  • a mixture of host-dopant is used according to the constitution of the present invention, noticeable improvement in luminous efficiency due to the inventive electroluminescent host could be confirmed. This can be achieved by the doping concentration of 0.5 to 10% by weight.
  • the host according to the present invention exhibits higher hole and electron conductivity, and excellent stability of material as compared to other conventional host materials, and provides improved device life as well as luminous efficiency.
  • the dopant compounds represented by Chemical Formula (3) can be exemplified by those described in Korean Patent Application No. 10-2009-0023442. More preferably they are selected from the following structures, but not restricted thereto.
  • the organic electroluminescent device according to the present invention may further comprise one or more compound(s) selected from a group consisting of arylamine compounds and styrylarylamine compounds, in addition to the organic electroluminescent compound represented by Chemical Formula (1).
  • the arylamine or styrylarylamine compounds are exemplified in Korean Patent Application Nos. 10-2008-0123276, 10-2008-0107606 and 10-2008-0118428, but not being restricted thereto.
  • the organic layer may further comprise one or more metal(s) selected from a group consisting of organometals of Group 1, Group 2, 4 th period and 5 th period transition metals, lanthanide metals and d-transition elements in the Periodic Table of Elements, or complex(es) thereof, as well as the electroluminescent compound represented by Chemical Formula (1).
  • the organic layer may comprise an electroluminescent layer and a charge generating layer at the same time.
  • the organic electroluminescent device may also comprise one or more organic electroluminescent layer(s) emitting blue, green or red light, in addition to the organic electroluminescent compound(s) represented by Chemical Formula (1), to form an organic electroluminescent device emitting white light.
  • the compounds emitting blue, green or red light are exemplified by Korean Patent Application Nos. 10-2008-0123276, 10-2008-0107606 and 10-2008-0118428, but not being restricted thereto.
  • an organic electroluminescent device it is preferable to arrange one or more layer(s) (here-in-below, referred to as the ‘surface layer’) selected from chalcogenide layers, metal halide layers and metal oxide layers, on the inner surface of at least one side of the pair of electrodes.
  • the surface layer selected from chalcogenide layers, metal halide layers and metal oxide layers.
  • a chalcogenide layer of silicon and aluminum metal (including oxides) on the anode surface of the EL medium layer, and a metal halide layer or a metal oxide layer on the cathode surface of the EL medium layer.
  • Examples of metal halides preferably include LiF, MgF 2 , CaF 2 , fluorides of rare earth metal or the like.
  • Examples of metal oxides preferably include Cs 2 O, Li 2 O, MgO, SrO, BaO, CaO, or the like.
  • an organic electroluminescent device it is also preferable to arrange, on at least one surface of the pair of electrodes thus manufactured, a mixed region of electron transport compound and a reductive dopant, or a mixed region of a hole transport compound with an oxidative dopant. Accordingly, the electron transport compound is reduced to an anion, so that injection and transportation of electrons from the mixed region to an EL medium are facilitated. In addition, since the hole transport compound is oxidized to form a cation, injection and transportation of holes from the mixed region to an EL medium are facilitated.
  • Preferable oxidative dopants include various Lewis acids and acceptor compounds.
  • Preferable reductive dopants include alkali metals, alkali metal compounds, alkaline earth metals, rare-earth metals, and mixtures thereof.
  • a white electroluminescent device having two or more electroluminescent layers can be manufactured by employing a reductive dopant layer as a charge generating layer.
  • the organic electroluminescent compounds according to the present invention exhibit high luminous efficiency and excellent life property of the material, so that OLED’s having very good operation life can be manufactured therefrom.
  • OLED devices were manufactured by using the electroluminescent material according to the invention.
  • a transparent electrode ITO thin film (15 ⁇ / ⁇ ) prepared from glass for OLED (produced by Samsung-Corning) was subjected to ultrasonic washing with trichloroethylene, acetone, ethanol and distilled water, sequentially, and stored in isopropanol before use.
  • an ITO substrate was equipped in a substrate folder of a vacuum vapor-deposit device, and 4,4′4′′-tris(N,N-(2-naphthyl)-phenylamino)triphenylamine (2-TNATA)(of which the chemical structure is shown below) was placed in a cell of the vacuum vapor-deposit device, which was then ventilated up to 10 -6 torr of vacuum in the chamber. Electric current was applied to the cell to evaporate 2-TNATA, thereby providing vapor-deposit of a hole injection layer having 60 nm of thickness on the ITO substrate.
  • 2-TNATA 4,4′4′′-tris(N,N-(2-naphthyl)-phenylamino)triphenylamine
  • NPB N,N′-bis( ⁇ -naphthyl)-N,N′-diphenyl-4,4′-diamine
  • an electroluminescent layer was vapor-deposited thereon as follows. To one cell of a vacuum vapor-deposit device, charged was Compound (1) according to the present invention as host, and Compound (A) was charged to another cell as dopant. Two substances were evaporated at different rates to provide doping at a concentration of 2 to 5% by weight on the basis of the host. Thus, an electroluminescent layer having the thickness of 30 nm was vapor-deposited on the hole transport layer.
  • Each material employed for manufacturing an OLED was used as the electroluminescent material after purifying via vacuum sublimation at 10 -6 torr.
  • an electron transport layer and an electron injecting layer were vapor-deposited according to the same procedures as in Example 1, and Al cathode was vapor-deposited by using another vacuum vapor-deposit device with a thickness of 150 nm, to manufacture an OLED.
  • an electron transport layer and an electron injecting layer were vapor-deposited according to the same procedures as in Example 1, and Al cathode was vapor-deposited by using another vacuum vapor-deposit device with a thickness of 150 nm, to manufacture an OLED.

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Abstract

Disclosed are novel organic electroluminescent compounds and organic electroluminescent devices comprising the same. With good luminous efficiency and excellent color purity and life property, the organic electroluminescent compounds according to the invention can be used to manufacture OLED devices having very good operation life.

Description

NOVEL ORGANIC ELECTROLUMINESCENT COMPOUNDS AND ORGANIC ELECTROLUMINESCENT DEVICE USING THE SAME
The present invention relates to novel organic electroluminescent compounds and organic electroluminescent devices employing the same. Specifically, it relates to novel anthracene derivatives having electroluminescent properties, and organic electroluminescent devices employing the same as electroluminescent material.
Among display devices, electroluminescence (EL) devices, being self-luminous type display devices, have advantages of wide visual angle, excellent contrast as well as rapid response rate. Eastman Kodak firstly developed an organic EL device employing low molecular aromatic diamine and aluminum complex as a substance for forming an electroluminescent layer, in 1987 [Appl. Phys. Lett. 51, 913, 1987].
An organic EL device is a device wherein, when charge is applied to an organic film formed between an electron injection electrode (cathode) and a hole injection electrode (anode), an electron and a hole form a pair and then become extinct with emitting light. A device can be formed on a transparent flexible substrate such as plastics. The device can be operated at a lower voltage (not more than 10 V) with relatively lower power consumption but excellent color purity, as compared to a plasma display panel or an inorganic EL display. Since the organic electroluminescent (EL) devices can develop three colors (green, blue and red), they have been focused for full colored display devices for next generation.
The most important factor to determine luminous efficiency, lifetime or the like in an organic EL device is electroluminescent material. Several properties required for such electroluminescent materials include that the material should have high luminescent quantum yield in solid state and high mobility of electrons and holes, is not easily decomposed during vapor-deposition in vacuum, and forms uniform and stable thin film.
An organic EL device is composed of anode/HIL/HTL/EML/ETL/EIL/cathode. The color of the light emitted (blue, green, red) from the organic electroluminescent device can be realized depending on how the electroluminescent layer (EML) is formed.
The electroluminescent materials are classified into host materials and dopant materials from the aspect of their functions. It is generally known that a device structure having the most excellent EL properties can be fabricated with an EL layer prepared by doping a dopant to a host. Recently, development of organic EL devices with high efficiency and long life comes to the fore as an urgent subject, and particularly urgent is development of a material with far better EL properties as compared to conventional EL materials as considering EL properties required for a medium to large sized OLED panel.
In the meanwhile, as a green fluorescent material, a system wherein a coumarine derivative (Compound d, C545T), a quinacridone derivative (Compound e), DPT (Compound f) or the like is doped to Alq (a host), as a dopant, in a concentration from several % to not more than 20 % has been developed and widely used. However, the conventional electroluminescent materials suffer from significant problem in view of lifetime with noticeable reduction of initial efficiency, though they show good performance in view of initial luminous efficiency at the level of practical use. Thus, the materials have limitations to be employed for a high performance panel of larger screen.
Figure PCTKR2010001813-appb-I000001
Further, since the OLED devices manufactured therefrom cannot give satisfactory level of device life by any means, required is development of host material having far improved stability and performances.
The object of the invention is to overcome the problems described above, and to provide organic electroluminescent compounds comprising an excellent backbone to obtain better luminous efficiency, device life and appropriate color coordinate, as compared to conventional host materials.
Another object of the invention is to provide organic electroluminescent devices of high efficiency and long life by employing those organic electroluminescent compounds as electroluminescent material.
In order to achieve the above-mentioned objects, novel organic electroluminescent compounds were prepared according to the invention. Those compounds can be employed as electroluminescent material for an organic electroluminescent device, particularly as electroluminescent host, preferably green host. The compounds according to the invention provides organic electroluminescent devices with enhanced efficiency, lowered operation voltage and improved stability.
The present invention provides organic electroluminescent compounds represented by Chemical Formula (1):
[Chemical Formula 1]
Figure PCTKR2010001813-appb-I000002
wherein,
L1 and L2 independently represent a chemical bond, (C6-C30)arylene with or without substituent(s), (C3-C30)heteroarylene with or without substituent(s), 5- to 7-membered heterocycloalkylene with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkylene fused with one or more aromatic ring(s), (C3-C30)cycloalkylene with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkylene fused with one or more aromatic ring(s), adamantylene with or without substituent(s), (C7-C30)bicycloalkylene with or without substituent(s), (C2-C30)alkenylene with or without substituent(s), (C2-C30)alkynylene with or without substituent(s), (C6-C30)ar(C1-C30)alkylene with or without substituent(s), (C1-C30)alkylenethio with or without substituent(s), (C1-C30)alkylenoxy with or without substituent(s), (C6-C30)arylenoxy with or without substituent(s), (C6-C30)arylenethio with or without substituent(s), -O- or -S-;
R1 through R4 and Ar1 independently represent hydrogen, deuterium, halogen, (C1-C30)alkyl with or without substituent(s), (C6-C30) aryl with or without substituent(s), substituted or unsubstituted (C6-C30)aryl fused with one or more (C3-C30)cycloalkyl(s) with or without substituent(s), (C3-C30)heteroaryl with or without substituent(s), 5- to 7-membered heterocycloalkyl with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkyl fused with one or more aromatic ring(s), (C3-C30)cycloalkyl with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkyl fused with one or more aromatic ring(s), adamantyl with or without substituent(s), (C7-C30)bicycloalkyl with or without substituent(s), cyano, NR11R12, BR13R14, PR15R16, P(=O)R17R18 [wherein R11 through R18 independently represent (C1-C30)alkyl with or without substituent(s), (C6-C30)aryl with or without substituent(s) or (C3-C30)heteroaryl with or without substituent(s)], tri(C1-C30)alkylsilyl with or without substituent(s), di(C1-C30)alkyl(C6-C30)arylsilyl with or without substituent(s), tri(C6-C30)arylsilyl with or without substituent(s), (C6-C30)ar(C1-C30)alkyl with or without substituent(s), (C1-C30)alkyloxy with or without substituent(s), (C1-C30)alkylthio with or without substituent(s), (C6-C30)aryloxy with or without substituent(s), (C6-C30)arylthio with or without substituent(s), (C1-C30)alkoxycarbonyl with or without substituent(s), (C1-C30)alkylcarbonyl with or without substituent(s), (C6-C30)arylcarbonyl with or without substituent(s), (C2-C30)alkenyl with or without substituent(s), (C2-C30)alkynyl with or without substituent(s), (C6-C30)aryloxycarbonyl with or without substituent(s), (C1-C30)alkoxycarbonyloxy with or without substituent(s), (C1-C30)alkylcarbonyloxy with or without substituent(s), (C6-C30)arylcarbonyloxy with or without substituent(s), (C6-C30)aryloxycarbonyloxy with or without substituent(s), carboxyl, nitro,
Figure PCTKR2010001813-appb-I000003
,
Figure PCTKR2010001813-appb-I000004
or hydroxyl, or each of them may be linked to an adjacent substituent via (C3-C30)alkylene or (C3-C30)alkenylene with or without a fused ring to form an alicyclic ring or a mono- or polycyclic aromatic ring;
W represents -(CR51R52)m-, -(R51)C=C(R52)-, -N(R53)-, -S-, -O-, -Si(R54)(R55)-, -P(R56)-, -P(=O)(R57)-, -C(=O)- or -B(R58)-, and R51 through R58 and R61 through R63 are defined as above for R1 through R4;
each one of the heterocycloalkyl and heteroaryl contains one or more heteroatom(s) selected from B, N, O, S, P(=O), Si and P; and
m represents an integer 1 or 2.
The ‘alkyl’, ‘alkoxy’ and other substituents containing ‘alkyl’ moiety described herein include both linear and branched species.
The term ‘aryl’ described herein represents an organic radical derived from aromatic hydrocarbon by deleting one hydrogen atom therefrom. An aryl group may be a monocyclic or a fused ring system, each ring of which suitably contains from 4 to 7, preferably from 5 or 6 cyclic atoms. Structures wherein two or more aryl groups are combined through single bond(s) are also included. Specific examples include phenyl, naphthyl, biphenyl, anthryl, indenyl, fluorenyl, phenanthryl, triphenylenyl, pyrenyl, perylenyl, chrysenyl, naphtacenyl, fluoranthenyl and the like, but are not restricted thereto. The naphthyl may be 1-naphthyl or 2-naphthyl, the anthryl may be 1-anthryl, 2-anthryl or 9-anthryl, and the fluorenyl may be any one of 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl and 9-fluorenyl.
The term ‘heteroaryl’ described herein means an aryl group containing from 1 to 4 heteroatom(s) selected from B, N, O, S, P(=O), Si and P for the aromatic cyclic backbone atoms, and carbon atom(s) for remaining aromatic cyclic backbone atoms. The heteroaryl may be a 5- or 6-membered monocyclic heteroaryl or a polycyclic heteroaryl which is fused with one or more benzene ring(s), and may be partially saturated. The structures having one or more heteroaryl group(s) bonded through a single bond are also included. The heteroaryl groups may include divalent aryl groups of which the heteroatoms are oxidized or quarternized to form N-oxides, quaternary salts, or the like. Specific examples include monocyclic heteroaryl groups such as furyl, thiophenyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, triazolyl, tetrazolyl, furazanyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl; polycyclic heteroaryl groups such as benzofuranyl, benzothiophenyl, isobenzofuranyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazolyl, benzoxazolyl, isoindolyl, indolyl, indazolyl, benzothiadiazolyl, quinolyl, isoquinolyl, cinnolinyl, quinazolinyl, quinoxalinyl, carbazolyl, phenanthridinyl and benzodioxolyl; and corresponding N-oxides (for example, pyridyl N-oxide, quinolyl N-oxide) and quaternary salts thereof; but they are not restricted thereto.
The alkyl groups in ‘C1-C30)alkyl, tri(C1-C30)alkylsilyl, di(C1-C30)alkyl(C6-C30)arylsilyl, (C6-C30)ar(C1-C30)alkyl, (C1-C30)alkyloxy, (C1-C30)alkylthio, (C1-C30)alkyloxycarbonyl, (C1-C30)alkylcarbonyl, (C1-C30)alkyloxycarbonyloxy, (C1-C30)alkylcarbonyloxy’ described in the present specification may have restricted carbon number from 1 to 20, or from 1 to 10. The aryl groups in ‘(C6-C30)aryl, di(C1-C30)alkyl(C6-C30)arylsilyl, tri(C6-C30)arylsilyl, (C6-C30)ar(C1-C30)alkyl, (C6-C30)aryloxy, (C6-C30)arylthio, (C6-C30)arylcarbonyl, (C6-C30)aryloxycarbonyl, (C6-C30)arylcarbonyloxy or (C6-C30)aryloxycarbonyloxy’ may have restricted carbon number from 6 to 20, or from 6 to 12. The heteroaryl groups in ‘(C3-C30)heteroaryl’ may have restricted carbon number from 4 to 20, or from 4 to 12. The cycloalkyl groups in ‘(C3-C30)cycloalkyl’ may have restricted carbon number from 3 to 20, or from 3 to 7. The alkenyl or alkynyl of ‘(C2-C30)alkenyl or alkynyl’ may have restricted carbon number from 2 to 20, or from 2 to 10.
The term ‘substituted or unsubstituted(or with or without) substituent(s)’ described herein means having one or more substituent(s) independently selected from deuterium, halogen, (C1-C30)alkyl with or without halogen substituent(s), (C6-C30)aryl, (C3-C30)heteroaryl with or without (C6-C30)aryl substituent(s), a 5- to 7-membered heterocycloalkyl containing one or more heteroatom(s) selected from B, N, O, S, P(=O), Si and P, a 5- to 7-membered heterocycloalkyl fused with one or more aromatic ring(s), (C3-C30)cycloalkyl, (C6-C30)cycloalkyl fused with one or more aromatic ring(s), tri(C1-C30)alkylsilyl, di(C1-C30)alkyl(C6-C30)arylsilyl, tri(C6-C30)arylsilyl, adamantyl, (C7-C30)bicycloalkyl, (C2-C30)alkenyl, (C2-C30)alkynyl, cyano, carbazolyl, NR21R22, BR23R24, PR25R26, P(=O)R27R28[wherein R21 through R28 independently represent (C1-C30)alkyl, (C6-C30)aryl or (C3-C30)heteroaryl], (C6-C30)ar(C1-C30)alkyl, (C1-C30)alkyl(C6-C30)aryl, (C1-C30)alkyloxy, (C1-C30)alkylthio, (C6-C30)aryloxy, (C6-C30)arylthio, (C1-C30)alkoxycarbonyl, (C1-C30)alkylcarbonyl, (C6-C30)arylcarbonyl, (C6-C30)aryloxycarbonyl, (C1-C30)alkoxycarbonyloxy, (C1-C30)alkylcarbonyloxy, (C6-C30)arylcarbonyloxy, (C6-C30)aryloxycarbonyloxy, carboxyl, nitro and hydroxyl; or that the adjacent substituent(s) are linked together to form a ring.
In Chemical Formula (1), L1 and L2 are independently selected from a chemical bond; arylene groups such as phenylene, naphthylene, anthracenylene, biphenylene, fluorenylene, triphenylenylene, fluoranthenylene, chrysenylene, terphenylene, phenanthrylene, pyrenylene and perylenylene; and heteroarylene groups such as pyridinylene, pyrazinylene, furylene, thienylene, selenophenylene, quinolinylene, quinoxalinylene, phenanthrolinylene, but they are not restricted thereto. Those groups may be further substituted as described for Chemical Formula (1).
Each group of R1 through R4 and Ar1 is independently selected from aryl groups such as phenyl, naphthyl, anthryl, biphenyl, fluorenyl, phenanthryl, pyrenyl and perylenyl; heteroaryl groups such as pyridinyl, pyrazinyl, furyl, thienyl, selenophenyl, quinolinyl, quinoxalinyl, phenanthrolinyl, carbazolyl and benzopiperidinyl; aryl groups fused with cycloalkyl, such as tetrahydronaphthyl; heterocycloalkyl groups fused with one or more aromatic ring, such as benzopiperidino, dibenzomorpholino and dibenzoazepino; NR71R72, BR73R74, PR75R76, and P(=O)R77R78 [wherein, R71 through R78 independently represent substituted or unsubstituted (C1-C30)alkyl, substituted or unsubstituted (C6-C30)aryl or substituted or unsubstituted (C3-C30)heteroaryl], but not being restricted thereto, and each group may be further substituted by a substituent, as described for Chemical Formula (1).
Each group
Figure PCTKR2010001813-appb-I000005
or
Figure PCTKR2010001813-appb-I000006
can be exemplified by the following structures.
Figure PCTKR2010001813-appb-I000007
Figure PCTKR2010001813-appb-I000008
Figure PCTKR2010001813-appb-I000009
Figure PCTKR2010001813-appb-I000010
wherein, R51 through R58 independently represent substituted or unsubstituted (C1-C30)alkyl, substituted or unsubstituted (C6-C30)aryl, or substituted or unsubstituted (C3-C30)heteroaryl, or each of them may be linked to an adjacent substituent via (C3-C30)alkylene or (C3-C30)alkenylene with or without a fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring.
The organic electroluminescent compounds according to the present invention can be more specifically exemplified by the following compounds, but they are not restricted thereto.
Figure PCTKR2010001813-appb-I000011
Figure PCTKR2010001813-appb-I000012
Figure PCTKR2010001813-appb-I000013
Figure PCTKR2010001813-appb-I000014
Figure PCTKR2010001813-appb-I000015
Figure PCTKR2010001813-appb-I000016
Figure PCTKR2010001813-appb-I000017
Figure PCTKR2010001813-appb-I000018
Figure PCTKR2010001813-appb-I000019
Figure PCTKR2010001813-appb-I000020
Figure PCTKR2010001813-appb-I000021
Figure PCTKR2010001813-appb-I000022
Figure PCTKR2010001813-appb-I000023
Figure PCTKR2010001813-appb-I000024
Figure PCTKR2010001813-appb-I000025
Figure PCTKR2010001813-appb-I000026
Figure PCTKR2010001813-appb-I000027
Figure PCTKR2010001813-appb-I000028
Figure PCTKR2010001813-appb-I000029
Figure PCTKR2010001813-appb-I000030
Figure PCTKR2010001813-appb-I000031
Figure PCTKR2010001813-appb-I000032
Figure PCTKR2010001813-appb-I000033
Figure PCTKR2010001813-appb-I000034
Figure PCTKR2010001813-appb-I000035
Figure PCTKR2010001813-appb-I000036
Figure PCTKR2010001813-appb-I000037
The process for preparing the organic electroluminescent compounds according to the present invention is exemplified by Reaction Schemes (1) or (2), but not being restricted thereto.
[Reaction Scheme 1]
Figure PCTKR2010001813-appb-I000038
[Reaction Scheme 2]
Figure PCTKR2010001813-appb-I000039
In the Reaction Schemes, R1 through R4, L1, L2 and Ar1 are defined as for Chemical Formula (1).
The present invention also provides an organic electroluminescent device which is comprised of a first electrode; a second electrode; and at least one organic layer(s) interposed between the first electrode and the second electrode; wherein the organic layer comprises one or more organic electroluminescent compound(s) represented by Chemical Formula (1). The organic electroluminescent compound is employed as host material of the electroluminescent layer.
The organic electroluminescent device according to the present invention is characterized in that the organic layer comprises an electroluminescent layer containing one or more organic electroluminescent compound(s) represented by Chemical Formula (1), as well as one or more dopant(s). The dopant to be applied to an organic electroluminescent device according to the invention is not particularly restricted, but preferably selected from the compounds represented by Chemical Formula (2) or (3):
[Chemical Formula 2]
Figure PCTKR2010001813-appb-I000040
[Chemical Formula 3]
Figure PCTKR2010001813-appb-I000041
wherein,
L represents (C6-C30)arylene with or without substituent(s), (C3-C30)heteroarylene with or without substituent(s);
R151 through R154 independently represent hydrogen, deuterium, halogen, (C1-C30)alkyl with or without substituent(s), (C6-C30) aryl with or without substituent(s), (C3-C30)heteroaryl with or without substituent(s), 5- to 7-membered heterocycloalkyl with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkyl fused with one or more aromatic ring(s), (C3-C30)cycloalkyl with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkyl fused with one or more aromatic ring(s), adamantyl with or without substituent(s), (C7-C30)bicycloalkyl with or without substituent(s), cyano, NR41R42, BR43R44, PR45R46, P(=O)R47R48 [wherein R41 through R48 independently represent (C1-C30)alkyl with or without substituent(s), (C6-C30)aryl with or without substituent(s) or (C3-C30)heteroaryl with or without substituent(s)], tri(C1-C30)alkylsilyl with or without substituent(s), di(C1-C30)alkyl(C6-C30)arylsilyl with or without substituent(s), tri(C6-C30)arylsilyl with or without substituent(s), (C6-C30)ar(C1-C30)alkyl with or without substituent(s), (C1-C30)alkyloxy with or without substituent(s), (C1-C30)alkylthio with or without substituent(s), (C6-C30)aryloxy with or without substituent(s), (C6-C30)arylthio with or without substituent(s), (C1-C30)alkoxycarbonyl with or without substituent(s), (C1-C30)alkylcarbonyl with or without substituent(s), (C6-C30)arylcarbonyl with or without substituent(s), (C2-C30)alkenyl with or without substituent(s), (C2-C30)alkynyl with or without substituent(s), (C6-C30)aryloxycarbonyl with or without substituent(s), (C1-C30)alkoxycarbonyloxy with or without substituent(s), (C1-C30)alkylcarbonyloxy with or without substituent(s), (C6-C30)arylcarbonyloxy with or without substituent(s), (C6-C30)aryloxycarbonyloxy with or without substituent(s), carboxyl, nitro or hydroxyl, or each of them may be linked to an adjacent carbon via (C3-C30)alkylene or (C3-C30)alkenylene with or without a fused ring to form a fused ring; and
each one of the heterocycloalkyl and heteroaryl contains one or more heteroatom(s) selected from B, N, O, S, P(=O), Si and P.
The electroluminescent layer means the layer where electroluminescence occurs, and it may be a single layer or a multi-layer consisting of two or more layers laminated. When a mixture of host-dopant is used according to the constitution of the present invention, noticeable improvement in luminous efficiency due to the inventive electroluminescent host could be confirmed. This can be achieved by the doping concentration of 0.5 to 10% by weight. The host according to the present invention exhibits higher hole and electron conductivity, and excellent stability of material as compared to other conventional host materials, and provides improved device life as well as luminous efficiency.
The dopant compounds represented by Chemical Formula (3) can be exemplified by those described in Korean Patent Application No. 10-2009-0023442. More preferably they are selected from the following structures, but not restricted thereto.
Figure PCTKR2010001813-appb-I000042
Figure PCTKR2010001813-appb-I000043
Figure PCTKR2010001813-appb-I000044
Figure PCTKR2010001813-appb-I000045
Figure PCTKR2010001813-appb-I000046
The organic electroluminescent device according to the present invention may further comprise one or more compound(s) selected from a group consisting of arylamine compounds and styrylarylamine compounds, in addition to the organic electroluminescent compound represented by Chemical Formula (1). The arylamine or styrylarylamine compounds are exemplified in Korean Patent Application Nos. 10-2008-0123276, 10-2008-0107606 and 10-2008-0118428, but not being restricted thereto.
In an organic electroluminescent device according to the present invention, the organic layer may further comprise one or more metal(s) selected from a group consisting of organometals of Group 1, Group 2, 4th period and 5th period transition metals, lanthanide metals and d-transition elements in the Periodic Table of Elements, or complex(es) thereof, as well as the electroluminescent compound represented by Chemical Formula (1). The organic layer may comprise an electroluminescent layer and a charge generating layer at the same time.
The organic electroluminescent device may also comprise one or more organic electroluminescent layer(s) emitting blue, green or red light, in addition to the organic electroluminescent compound(s) represented by Chemical Formula (1), to form an organic electroluminescent device emitting white light. The compounds emitting blue, green or red light are exemplified by Korean Patent Application Nos. 10-2008-0123276, 10-2008-0107606 and 10-2008-0118428, but not being restricted thereto.
In an organic electroluminescent device according to the present invention, it is preferable to arrange one or more layer(s) (here-in-below, referred to as the ‘surface layer’) selected from chalcogenide layers, metal halide layers and metal oxide layers, on the inner surface of at least one side of the pair of electrodes. Specifically, it is preferable to arrange a chalcogenide layer of silicon and aluminum metal (including oxides) on the anode surface of the EL medium layer, and a metal halide layer or a metal oxide layer on the cathode surface of the EL medium layer. As the result, stability in operation can be obtained.
Examples of chalcogenides preferably include SiOx (1=X=2), AlOx (1=X=1.5), SiON, SiAlON, or the like. Examples of metal halides preferably include LiF, MgF2, CaF2, fluorides of rare earth metal or the like. Examples of metal oxides preferably include Cs2O, Li2O, MgO, SrO, BaO, CaO, or the like.
In an organic electroluminescent device according to the present invention, it is also preferable to arrange, on at least one surface of the pair of electrodes thus manufactured, a mixed region of electron transport compound and a reductive dopant, or a mixed region of a hole transport compound with an oxidative dopant. Accordingly, the electron transport compound is reduced to an anion, so that injection and transportation of electrons from the mixed region to an EL medium are facilitated. In addition, since the hole transport compound is oxidized to form a cation, injection and transportation of holes from the mixed region to an EL medium are facilitated. Preferable oxidative dopants include various Lewis acids and acceptor compounds. Preferable reductive dopants include alkali metals, alkali metal compounds, alkaline earth metals, rare-earth metals, and mixtures thereof.
A white electroluminescent device having two or more electroluminescent layers can be manufactured by employing a reductive dopant layer as a charge generating layer.
The organic electroluminescent compounds according to the present invention exhibit high luminous efficiency and excellent life property of the material, so that OLED’s having very good operation life can be manufactured therefrom.
The present invention is further described by referring to representative compounds with regard to the organic electroluminescent compounds according to the invention, preparation thereof and luminescent properties of the devices manufactured therefrom, but those examples are provided for illustration of the embodiments only, not being intended to limit the scope of the invention by any means.
[Preparation Example 1] Preparation of Compound (1)
Figure PCTKR2010001813-appb-I000047
Figure PCTKR2010001813-appb-I000048
Preparation of Compound (A)
A two-necked flask was charged with methyl 2-bromobenzoate (40 g, 152.6 mmol), naphthalen-1-ylboronic acid (31.5 g, 183.2 mmol) and tetrakis(triphenylphosphine)palladium [Pd(PPh3)4] (8.8 g, 7.62 mmol). While stirring the mixture, toluene (1 L) was added, and then 2 M potassium carbonate solution (228 mL, 458 mmol) and ethanol (228 mL). The mixture was heated under reflux at 100℃ for 5 hours. When the reaction was completed, the reaction mixture was cooled to room temperature, and extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (A) (35 g, 87%).
Preparation of Compound (B)
A one-necked flask containing Compound (A) (24 g, 91.49 mmol) was vacuated and filled with argon. After adding tetrahydrofuran (1 L), the mixture was stirred at -75℃ for 10 minutes. Methyl lithium (1.6 M MeLi in hexane) (257 mL, 0.41 mol) was added thereto, and the resultant mixture was stirred at -75℃ for 10 minutes, and then at ambient temperature for 3 hours. When the reaction was completed, the reaction mixture was extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (B) (20 g, 83%).
Preparation of Compound (C)
To a one-necked flask containing Compound (B) (20 g, 76.23 mmol), added was AcOH (300 mL), and the mixture was stirred at 0℃ for 10 minutes. After adding H3PO4 (400 mL), the resultant mixture was stirred at ambient temperature for 1 hour. When the reaction was completed, the reaction mixture was neutralized by adding NaOH, and extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (C) (13.5 g, 72%).
Preparation of Compound (D)
A one-necked flask containing Compound (C) (13.5 g, 55.25 mmol) was vacuated and filled with argon. After adding tetrahydrofuran (500 mL), the mixture was stirred at 0℃ for 10 minutes. NBS (19.6 g, 0.11 mol) was added thereto, and the resultant mixture was stirred at ambient temperature for one day. When the reaction was completed, the reaction mixture was extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (D) (13 g, 73%).
Preparation of Compound (E)
A one-necked flask containing Compound (D) (13 g, 42.21 mmol) was vacuated and filled with argon. After adding tetrahydrofuran (500 mL), the mixture was stirred at -78℃ for 10 minutes. To the mixture added was n-BuLi (2.5 M in hexane) (24.1 mL, 60.32 mmol), and the resultant mixture was stirred at the same temperature for 1.5 hours. Trimethyl borate (6.85 mL, 60.32 mmol) was then added at -78℃. The reaction mixture was stirred at -78℃ for 30 minutes and then at room temperature for 4 hours. When the reaction was completed, the reaction mixture was extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (E) (8 g, 69%).
Preparation of Compound (F)
A two-necked flask was charged with 2-chloroanthracene-9,10(4aH,9aH)-dione (50 g, 0.2 mol), phenylboronic acid (37.6 g, 0.3 mol) and tetrakis(triphenylphosphine)palladium (9.5 g, 8.24 mmol). While stirring the mixture, toluene was added, and then 2 M potassium carbonate solution (500 mL, 1.0 mol) and ethanol (500 mL). The mixture was heated under reflux at 120℃ for 5 hours. When the reaction was completed, the reaction mixture was cooled to room temperature, and extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (F) (56 g, 95%).
Preparation of Compound (G)
To a one-necked flask containing Compound (F) (50 g, 0.17 mol), added was AcOH (1 L), and the mixture was stirred for 10 minutes. After adding H3PO2 (380 g, 5.76 mol) and HI (781 g, 6.11 mol), the resultant mixture was stirred at 150℃ for one day. When the reaction was completed, the reaction mixture was neutralized by adding NaOH solution and HCl, and the solid produced was filtered. The solid was added to ethyl acetate, and recrystallized under reflux at 100℃ to isolate Compound (G) (40 g, 90%).
Preparation of Compound (H)
A one-necked flask containing Compound (G) (40 g, 0.15 mol) was vacuated and filled with argon. After adding dichloromethane (500 mL), the mixture was stirred at 0℃ for 10 minutes. NBS (28 g, 0.15 mol) was added thereto, and the resultant mixture was stirred at ambient temperature for one day. When the reaction was completed, the reaction mixture was extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (H) (48 g, 92%).
Preparation of Compound (I)
A two-necked flask was charged with Compound (H) (48 g, 0.14 mol), Compound (E) (43 g, 0.15 mol) and tetrakis(triphenylphosphine)palladium (8.3 g, 7.2 mmol). While stirring the mixture, toluene was added, and then 2 M potassium carbonate solution (720 mL, 1.4 mol) and ethanol (720 mL). The mixture was heated under reflux at 120℃ for 5 hours. When the reaction was completed, the reaction mixture was cooled to room temperature, and extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (I) (60 g, 84%).
Preparation of Compound (J)
A one-necked flask containing Compound (I) (60 g, 0.12 mol) was vacuated and filled with argon. After adding dichloromethane (600 mL), the mixture was stirred at 0℃ for 10 minutes. NBS (38.7 g, 0.21 mol) was added thereto, and the resultant mixture was stirred at ambient temperature for one day. When the reaction was completed, the reaction mixture was extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (J) (60 g, 86%).
Preparation of Compound (1)
A two-necked flask was charged with Compound (J) (10 g, 17.37 mmol), phenylboronic acid (3.1 g, 26.06 mmol) and tetrakis(triphenylphosphine)palladium (1.0 g, 0.86 mmol). While stirring the mixture, toluene was added, and then 2 M potassium carbonate solution (86 mL, 0.17 mol) and ethanol (86 mL). The mixture was heated under reflux at 120℃ for 5 hours. When the reaction was completed, the reaction mixture was cooled to room temperature, and extracted with distilled water and ethyl acetate. The organic layer was dried over MgSO4, and evaporated by using a rotary evaporator to remove solvent. Purification via column chromatography (hexane and ethyl acetate as eluent) gave Compound (1) (8.5 g, 85%).
According to the same procedure as described in Preparation Example 1, prepared were organic electroluminescent compounds (Compounds 1 to 120), of which 1H NMR and MS/FAB data are listed in Table 1.
[Table 1]
Figure PCTKR2010001813-appb-I000049
Figure PCTKR2010001813-appb-I000050
[Example 1] Manufacture of OLED’s by using organic electroluminescent compounds according to the present invention
OLED devices were manufactured by using the electroluminescent material according to the invention.
First, a transparent electrode ITO thin film (15 Ω/□) prepared from glass for OLED (produced by Samsung-Corning) was subjected to ultrasonic washing with trichloroethylene, acetone, ethanol and distilled water, sequentially, and stored in isopropanol before use.
Then, an ITO substrate was equipped in a substrate folder of a vacuum vapor-deposit device, and 4,4′4″-tris(N,N-(2-naphthyl)-phenylamino)triphenylamine (2-TNATA)(of which the chemical structure is shown below) was placed in a cell of the vacuum vapor-deposit device, which was then ventilated up to 10-6 torr of vacuum in the chamber. Electric current was applied to the cell to evaporate 2-TNATA, thereby providing vapor-deposit of a hole injection layer having 60 nm of thickness on the ITO substrate.
Then, to another cell of the vacuum vapor-deposit device, charged was N,N′-bis(α-naphthyl)-N,N′-diphenyl-4,4′-diamine (NPB) (of which the structure is shown below), and electric current was applied to the cell to evaporate NPB, thereby providing vapor-deposit of a hole transport layer of 20 nm of thickness on the hole injection layer.
Figure PCTKR2010001813-appb-I000051
After forming the hole injecting layer and the hole transport layer, an electroluminescent layer was vapor-deposited thereon as follows. To one cell of a vacuum vapor-deposit device, charged was Compound (1) according to the present invention as host, and Compound (A) was charged to another cell as dopant. Two substances were evaporated at different rates to provide doping at a concentration of 2 to 5% by weight on the basis of the host. Thus, an electroluminescent layer having the thickness of 30 nm was vapor-deposited on the hole transport layer.
Figure PCTKR2010001813-appb-I000052
Then, tris(8-hydroxyquinoline)aluminum (III) (Alq) (of which the structure is shown below) was vapor-deposited as an electron transport layer with a thickness of 20 nm, and lithium quinolate (Liq) (of which the structure is shown below) was vapor-deposited as an electron injecting layer with a thickness of 1 to 2 nm. Thereafter, an Al cathode was vapor-deposited with a thickness of 150 nm by using another vacuum vapor-deposit device to manufacture an OLED.
Figure PCTKR2010001813-appb-I000053
Each material employed for manufacturing an OLED was used as the electroluminescent material after purifying via vacuum sublimation at 10-6 torr.
[Comparative Example 1] Manufacture of an OLED by using conventional electroluminescent material
After forming a hole injecting layer and a hole transport layer according to the same procedure as described in Example 1, tris(8-hydroxyquinoline)aluminum (III) (Alq) was charged to another cell of said vacuum vapor-deposit device as electroluminescent host material, while Coumarin 545T (C545T) (of which the structure is shown below) was charged to still another cell. Two substances were evaporated at different rates to provide doping. Thus, an electroluminescent layer having the thickness of 30 nm was vapor-deposited on the hole transport layer. The doping concentration is preferably from 1 to 3% by weight on the basis of Alq.
Figure PCTKR2010001813-appb-I000054
Then, an electron transport layer and an electron injecting layer were vapor-deposited according to the same procedures as in Example 1, and Al cathode was vapor-deposited by using another vacuum vapor-deposit device with a thickness of 150 nm, to manufacture an OLED.
[Comparative Example 2] Manufacture of an OLED by using conventional electroluminescent material
After forming a hole injecting layer and a hole transport layer according to the same procedure as described in Example 1, dinaphthylanthracene (DNA) was charged to another cell of said vacuum vapor-deposit device as electroluminescent host material, while Compound (A) was charged to still another cell. Two substances were evaporated at different rates to provide doping at a concentration of 2 to 5% by weight on the basis of the host. Thus, an electroluminescent layer having the thickness of 30 nm was vapor-deposited on the hole transport layer.
Figure PCTKR2010001813-appb-I000055
Then, an electron transport layer and an electron injecting layer were vapor-deposited according to the same procedures as in Example 1, and Al cathode was vapor-deposited by using another vacuum vapor-deposit device with a thickness of 150 nm, to manufacture an OLED.
The luminous efficiencies of the OLED’s comprising the organic electroluminescent compounds according to the present invention (Example 1) and conventional electroluminescent compounds (Comparative Examples 1 and 2) were measured at 5,000 cd/m2, respectively, and the results are shown in Table 2.
[Table 2]
Figure PCTKR2010001813-appb-I000056
As can be seen from Table 2, when the organic electroluminescent compounds according to the present invention are applied to green electroluminescent devices, obtained were devices having higher luminous efficiencies with lower operation voltage while maintaining comparable or higher color purity, as compared to that of Comparative Examples 1 and 2.

Claims (8)

  1. An organic electroluminescent compound represented by Chemical Formula (1):
    [Chemical Formula 1]
    Figure PCTKR2010001813-appb-I000057
    wherein,
    L1 and L2 independently represent a chemical bond, (C6-C30)arylene with or without substituent(s), (C3-C30)heteroarylene with or without substituent(s), 5- to 7-membered heterocycloalkylene with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkylene fused with one or more aromatic ring(s), (C3-C30)cycloalkylene with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkylene fused with one or more aromatic ring(s), adamantylene with or without substituent(s), (C7-C30)bicycloalkylene with or without substituent(s), (C2-C30)alkenylene with or without substituent(s), (C2-C30)alkynylene with or without substituent(s), (C6-C30)ar(C1-C30)alkylene with or without substituent(s), (C1-C30)alkylenethio with or without substituent(s), (C1-C30)alkylenoxy with or without substituent(s), (C6-C30)arylenoxy with or without substituent(s), (C6-C30)arylenethio with or without substituent(s), -O- or -S-;
    R1 through R4 and Ar1 independently represent hydrogen, deuterium, halogen, (C1-C30)alkyl with or without substituent(s), (C6-C30) aryl with or without substituent(s), substituted or unsubstituted (C6-C30)aryl fused with one or more (C3-C30)cycloalkyl(s) with or without substituent(s), (C3-C30)heteroaryl with or without substituent(s), 5- to 7-membered heterocycloalkyl with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkyl fused with one or more aromatic ring(s), (C3-C30)cycloalkyl with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkyl fused with one or more aromatic ring(s), adamantyl with or without substituent(s), (C7-C30)bicycloalkyl with or without substituent(s), cyano, NR11R12, BR13R14, PR15R16, P(=O)R17R18 [wherein R11 through R18 independently represent (C1-C30)alkyl with or without substituent(s), (C6-C30)aryl with or without substituent(s) or (C3-C30)heteroaryl with or without substituent(s)], tri(C1-C30)alkylsilyl with or without substituent(s), di(C1-C30)alkyl(C6-C30)arylsilyl with or without substituent(s), tri(C6-C30)arylsilyl with or without substituent(s), (C6-C30)ar(C1-C30)alkyl with or without substituent(s), (C1-C30)alkyloxy with or without substituent(s), (C1-C30)alkylthio with or without substituent(s), (C6-C30)aryloxy with or without substituent(s), (C6-C30)arylthio with or without substituent(s), (C1-C30)alkoxycarbonyl with or without substituent(s), (C1-C30)alkylcarbonyl with or without substituent(s), (C6-C30)arylcarbonyl with or without substituent(s), (C2-C30)alkenyl with or without substituent(s), (C2-C30)alkynyl with or without substituent(s), (C6-C30)aryloxycarbonyl with or without substituent(s), (C1-C30)alkoxycarbonyloxy with or without substituent(s), (C1-C30)alkylcarbonyloxy with or without substituent(s), (C6-C30)arylcarbonyloxy with or without substituent(s), (C6-C30)aryloxycarbonyloxy with or without substituent(s), carboxyl, nitro,
    Figure PCTKR2010001813-appb-I000058
    ,
    Figure PCTKR2010001813-appb-I000059
    or hydroxyl, or each of them may be linked to an adjacent substituent via (C3-C30)alkylene or (C3-C30)alkenylene with or without a fused ring to form an alicyclic ring or a mono- or polycyclic aromatic ring;
    W represents -(CR51R52)m-, -(R51)C=C(R52)-, -N(R53)-, -S-, -O-, -Si(R54)(R55)-, -P(R56)-, -P(=O)(R57)-, -C(=O)- or -B(R58)-, and R51 through R58 and R61 through R63 are defined as above for R1 through R4;
    each one of the heterocycloalkyl and heteroaryl contains one or more heteroatom(s) selected from B, N, O, S, P(=O), Si and P; and
    m represents an integer 1 or 2.
  2. The organic electroluminescent compound according to claim 1, wherein each substituent of L1 and L2, R1 through R4, R11 through R18, R51 through R58, R61 through R63 and Ar1 is independently substituted by one or more substituent(s) selected from a group consisting of hydrogen, deuterium, halogen, (C1-C30)alkyl with or without halogen substituent(s), (C6-C30)aryl, (C3-C30)heteroaryl with or without (C6-C30)aryl substituent(s), 5- to 7-membered heterocycloalkyl, 5- to 7-membered heterocycloalkyl fused with one or more aromatic ring(s), (C3-C30)cycloalkyl, (C3-C30)cycloalkyl fused with one or more aromatic ring(s), tri(C1-C30)alkylsilyl, di(C1-C30)alkyl(C6-C30)arylsilyl, tri(C6-C30)arylsilyl, adamantyl, (C7-C30)bicycloalkyl, (C2-C30)alkenyl, (C2-C30)alkynyl, cyano, carbazolyl, NR21R22, BR23R24, PR25R26, P(=O)R27R28 [wherein R21 through R28 independently represent (C1-C30)alkyl with or without substituent(s), (C6-C30)aryl with or without substituent(s) or (C3-C30)heteroaryl with or without substituent(s)], (C6-C30)ar(C1-C30)alkyl, (C1-C30)alkyl(C6-C30)aryl, (C1-C30)alkyloxy, (C1-C30)alkylthio, (C6-C30)aryloxy, (C6-C30)arylthio, (C1-C30)alkoxycarbonyl, (C1-C30)alkylcarbonyl, (C6-C30)arylcarbonyl, (C6-C30)aryloxycarbonyl, (C1-C30)alkoxycarbonyloxy, (C1-C30)alkylcarbonyloxy, (C6-C30)arylcarbonyloxy, (C6-C30)aryloxycarbonyloxy, carboxyl, nitro and hydroxyl, or the adjacent substituents are linked each other to form a ring.
  3. An organic electroluminescent device comprising the organic electroluminescent compound according to claim 1 or 2.
  4. The organic electroluminescent device according to claim 3, which is comprised of a first electrode; a second electrode; and one or more organic layer(s) interposed between the first electrode and the second electrode, wherein the organic layer comprises one or more organic electroluminescent compound(s) according to claim 1, and one or more dopant(s) represented by Chemical Formula (2) or (3):
    [Chemical Formula 2]
    Figure PCTKR2010001813-appb-I000060
    [Chemical Formula 3]
    Figure PCTKR2010001813-appb-I000061
    wherein,
    L represents (C6-C30)arylene with or without substituent(s), (C3-C30)heteroarylene with or without substituent(s);
    R151 through R154 independently represent hydrogen, deuterium, halogen, (C1-C30)alkyl with or without substituent(s), (C6-C30) aryl with or without substituent(s), (C3-C30)heteroaryl with or without substituent(s), 5- to 7-membered heterocycloalkyl with or without substituent(s), substituted or unsubstituted 5- to 7-membered heterocycloalkyl fused with one or more aromatic ring(s), (C3-C30)cycloalkyl with or without substituent(s), substituted or unsubstituted (C3-C30)cycloalkyl fused with one or more aromatic ring(s), adamantyl with or without substituent(s), (C7-C30)bicycloalkyl with or without substituent(s), cyano, NR41R42, BR43R44, PR45R46, P(=O)R47R48 [wherein R41 through R48 independently represent (C1-C30)alkyl with or without substituent(s), (C6-C30)aryl with or without substituent(s) or (C3-C30)heteroaryl with or without substituent(s)], tri(C1-C30)alkylsilyl with or without substituent(s), di(C1-C30)alkyl(C6-C30)arylsilyl with or without substituent(s), tri(C6-C30)arylsilyl with or without substituent(s), (C6-C30)ar(C1-C30)alkyl with or without substituent(s), (C1-C30)alkyloxy with or without substituent(s), (C1-C30)alkylthio with or without substituent(s), (C6-C30)aryloxy with or without substituent(s), (C6-C30)arylthio with or without substituent(s), (C1-C30)alkoxycarbonyl with or without substituent(s), (C1-C30)alkylcarbonyl with or without substituent(s), (C6-C30)arylcarbonyl with or without substituent(s), (C2-C30)alkenyl with or without substituent(s), (C2-C30)alkynyl with or without substituent(s), (C6-C30)aryloxycarbonyl with or without substituent(s), (C1-C30)alkoxycarbonyloxy with or without substituent(s), (C1-C30)alkylcarbonyloxy with or without substituent(s), (C6-C30)arylcarbonyloxy with or without substituent(s), (C6-C30)aryloxycarbonyloxy with or without substituent(s), carboxyl, nitro or hydroxyl, or each of them may be linked to an adjacent carbon via (C3-C30)alkylene or (C3-C30)alkenylene with or without a fused ring to form a fused ring; and
    each one of the heterocycloalkyl and heteroaryl contains one or more heteroatom(s) selected from B, N, O, S, P(=O), Si and P.
  5. The organic electroluminescent device according to claim 4, wherein the organic layer comprises one or more compound(s) selected from a group consisting of arylamine compounds and styrylarylamine compounds.
  6. The organic electroluminescent device according to claim 4, wherein the organic layer further comprises one or more metal(s) selected from a group consisting of organic metals of Group 1, Group 2, 4th period and 5th period transition metals, lanthanide metals and d-transition elements in the Periodic Table of Elements, or complex(es) thereof.
  7. The organic electroluminescent device according to claim 4, wherein the organic layer comprises an electroluminescent layer and a charge generating layer.
  8. The organic electroluminescent device according to claim 4, which is a white light-emitting organic electroluminescent device wherein the organic layer simultaneously comprises one or more organic electroluminescent layer(s) emitting blue, red or green light.
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