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WO2004075603A2 - Organic electroluminescent device - Google Patents

Organic electroluminescent device Download PDF

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Publication number
WO2004075603A2
WO2004075603A2 PCT/KR2004/000342 KR2004000342W WO2004075603A2 WO 2004075603 A2 WO2004075603 A2 WO 2004075603A2 KR 2004000342 W KR2004000342 W KR 2004000342W WO 2004075603 A2 WO2004075603 A2 WO 2004075603A2
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WO
WIPO (PCT)
Prior art keywords
organic electroluminescent
electroluminescent device
electrode
hole
group
Prior art date
Application number
PCT/KR2004/000342
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French (fr)
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WO2004075603A3 (en
Inventor
Jeong Dae Seo
Hee Jung Kim
Kyung Hoon Lee
Hyoung Yun Oh
Myung Seop Kim
Chun Gun Park
Original Assignee
Lg Electronics Inc.
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Publication date
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to EP04712772.5A priority Critical patent/EP1595292B1/en
Priority to JP2006500648A priority patent/JP4351698B2/en
Publication of WO2004075603A2 publication Critical patent/WO2004075603A2/en
Publication of WO2004075603A3 publication Critical patent/WO2004075603A3/en

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
    • H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B1/00—Dyes with anthracene nucleus not condensed with any other ring
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
    • C09B23/14—Styryl dyes
    • C09B23/145—Styryl dyes the ethylene chain carrying an heterocyclic residue, e.g. heterocycle-CH=CH-C6H5
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B57/00—Other synthetic dyes of known constitution
    • C09B57/008—Triarylamine dyes containing no other chromophores
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/10—Transparent electrodes, e.g. using graphene
    • H10K2102/101—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
    • H10K2102/103—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising indium oxides, e.g. ITO
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/18—Carrier blocking layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/311—Phthalocyanine
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
    • H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
    • H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/917—Electroluminescent

Definitions

  • the present invention relates to an organic luminescent device, and more particularly, to a hole-blocking layer.
  • the flat display is an organic electroluminescent device also called as an organic light emitting diode
  • the organic electroluminescent device emits light in a manner that electric charges are injected in an organic layer formed between an anode and a cathode so as to form a pair of electron and hole to generate an exciton and an excited state of the exciton falls to a ground state so as to emit light.
  • the organic electroluminescent device is not only formed on a flexible transparent substrate such as a plastic but also operated at a lower voltage (less than 10V) compared to a plasma display panel or an inorganic electroluminescent display.
  • the organic electroluminescent device has advantages in that power consumption is reduced and various colors are available.
  • the organic electroluminescent device enables to express three colors including green, blue, and red. Therefore, many concerns are focused on the organic electroluminescent device as the next generation full color display.
  • the organic electroluminescent device generates an exciton by coupling a hole from a hole transferring layer with an electron form the hole transferring layer, the exciton corresponding to a luminescent area.
  • the exciton can be generated by the fast transferring speed of the hole in 'another area. except the luminescent area..
  • the exciton generated in another area except the luminescent area illuminates in that area only, thus, there is a problem lowering color purity and brightness.
  • a material blocking a movement of the hole needs to be formed around the luminescent layer.
  • the present invention is directed to an organic electroluminescent device that substantially obviates one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide an organic electroluminescent device with enhanced brightness and color purity is obtained by forming a hole-blocking layer formed between the light-emitting layer and a cathode.
  • an organic electroluminescent device includes a substrate, a first and second electrodes, and a light-emitting layer formed between the first electrode and the second electrode, and a hole-blocking layer using a material of a following chemical formula 1.
  • At least one of Al and A2 is selected from a substituted or non- substituted aromatic group, a heterocyclic group, an aliphatic group, halogen, and hydrogen.
  • Al and A2 Structures of Al and A2 the same or different. At least one of Al and A2 substituted or non-substituted is selected from phenyl, biphenyl, pyridyl, naphthyl, qumolyl, isoquinolyl, fluorenyl, terphenyl, methyl, ethyl, propyl, isopropyl, and halogen groups.
  • a substitute of the Al and A2 is at least one selected from aryl, alkyl, aryloxy, alkoxy, arylamino, alkylamino, hydroxyl, ammo, halogen and cyano group.
  • a substitute of the Al and A2 is at least one selected from phenyl, biphenyl, triphenyl, phenylethenyl, diphenylethenyl, phenylethynyl, phenoxy, tolyoxy, vinyl, methyl, ethyl, propyl, isopropyl, t-butyl, cyclohexyl, diphenylamino, carbazolyl, morpholinyl, methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino, fluorine and chlorine group.
  • a first electrode and a second electrode are formed on a in a vertical direction and a light-emitting layer is formed between the first electrode and the second electrode.
  • At least one of Al and A2 is selected from a substituted or non- substituted aromatic group, a heterocyclic group, an aliphatic group, a halogen, 15 and hydrogen.
  • Al and A2 can be the same or different. Also, at least one of Al and A2 is selected from a substituted or non-substituted phenyl, biphenyl, pyridyl, naphthyl, quinolyl, isoquinolyl, fluorenyl, terphenyl, methyl, ethyl, propyl, isopropyl, and halogen groups. 20 Each substitute of the Al and A2 is at least one selected from aryl, alkyl, aryloxy, alkoxy, arylamino, alkylamino, hydroxyl, amino, halogen and cyano group.
  • Each substitute of the Al and A2 is at least one selected from phenyl, biphenyl, triphenyl, phenylethenyl, diphenylethenyl, phenylethynyl, phenoxy, tolyoxy, vinyl, methyl, ethyl, propyl, isopropyl, t-butyl, cyclohexyl, diphenylamino, carbazolyl, morpholinyl, methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino, fluorine and chlorine group.
  • At least one of the Al and A2 may be one of the following chemical formulas 2.
  • the material of the hole-blocking layer may be at least one of the following chemical formulas. [Chemical fomiula 3]
  • trimethylborate(0.92ml, 0008 lmol) is slowly added into the bath at -78 ° C and stirred for 12 hours at a room temperature.
  • Diphenyl-vinyl)-phenyl boronic acid (0.26g, 0.0009mol), tetrakis(triphenyl- phosphine)palladium(0 ⁇ 0.035g, 0.05eq), Potassium carbonate(0.25g, 0.002mol) melted into Toluene(30mL), THF(30mL), H 2 O(30mL) are admitted into a two- neck-r.b.f. The solution is heated in a hot oil bath at about 100°C and stirred for
  • the solvent is distilled under reduced pressure and filtered by using methanol, whereby a yell solid matter of 9-[4-(2,2-Diphenyl-vinyl)-phenyl]-10-(4- trityl-phenyl)-anthracene (0.42g, 91%) is obtained.
  • An ITO glass is patterned so as to have a size of 2mm x 2mm. The patterned ITO glass is then cleaned.
  • a substrate is loaded on a vacuum chamber of which basic pressure is set up as lxlO "6 torr and CuPC(200A), NPD(400 A), CBP+(btp) 2 lr(acac)(8%)(200 A), the hole-blocking layer (100 A), Alq 3 (300A), LiF(5 A), A1(1000A) are deposited on the ITO in order.
  • the ITO glass is patterned so as to have a size of 3mm x 3mm.
  • the patterned ITO glass is then cleaned.
  • a substrate is loaded on a vacuum chamber of which basic pressure is set up as 1x10 " torr and CuPC(20 ⁇ A), NPD(40 ⁇ A) 3
  • LiF(5 A), Al(1000 A) are deposited on the ITO in order.
  • 1018cd/m 2 (9.97V)1135cd/m 2 (9.30V) is shown at about 1mA
  • brightness shows about 1018cd/m 2 (9.97V)
  • CIE ⁇ x 0.659
  • y 0.329
  • Lifetime half of first brightness shows 2000cd/m at about 1mA.
  • the present invention is the organic elecroluminescent device including the hole-blocking layer between the anode and cathode.
  • the organic elecroluminescent device with enhanced brightness and color purity is obtained through the hole-blocking layer.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Disclosed is an organic electroluminescent device including a substrate, a first and second electrodes, and a light-emitting layer formed between the first electrode and the second electrode, and a hole-blocking layer formed between the light-emitting layer and the second electrode. The hole-blocking layer contains 9, 10-disubstituted anthracene. At least one of the substituents is selected from a substitued or non-substituted aromatic group, a heterocyclic group, an aliphtic group, halogen, and hydrogen.

Description

ORGANIC ELECTROLUMINESCENT DEVICE
Technical Field
The present invention relates to an organic luminescent device, and more particularly, to a hole-blocking layer.
Background Art
Recently, with the trend of a large sized display, a request of a flat display that occupies a small area has been increased. One example of the flat display is an organic electroluminescent device also called as an organic light emitting diode
(OLED). And, technology for the organic electroluminescent display is developed rapidly, whereby various prototypes have been in market already.
The organic electroluminescent device emits light in a manner that electric charges are injected in an organic layer formed between an anode and a cathode so as to form a pair of electron and hole to generate an exciton and an excited state of the exciton falls to a ground state so as to emit light.
The organic electroluminescent device is not only formed on a flexible transparent substrate such as a plastic but also operated at a lower voltage (less than 10V) compared to a plasma display panel or an inorganic electroluminescent display.
Also, the organic electroluminescent device has advantages in that power consumption is reduced and various colors are available.
Moreover, the organic electroluminescent device enables to express three colors including green, blue, and red. Therefore, many concerns are focused on the organic electroluminescent device as the next generation full color display.
The organic electroluminescent device generates an exciton by coupling a hole from a hole transferring layer with an electron form the hole transferring layer, the exciton corresponding to a luminescent area.
However, the exciton can be generated by the fast transferring speed of the hole in 'another area. except the luminescent area..
The exciton generated in another area except the luminescent area illuminates in that area only, thus, there is a problem lowering color purity and brightness.
Therefore, for increasing the performance and the brightness of the device, a material blocking a movement of the hole needs to be formed around the luminescent layer.
Disclosure of Invention
Accordingly, the present invention is directed to an organic electroluminescent device that substantially obviates one or more problems due to limitations and disadvantages of the related art. An object of the present invention is to provide an organic electroluminescent device with enhanced brightness and color purity is obtained by forming a hole-blocking layer formed between the light-emitting layer and a cathode.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to
- those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, an organic electroluminescent device includes a substrate, a first and second electrodes, and a light-emitting layer formed between the first electrode and the second electrode, and a hole-blocking layer using a material of a following chemical formula 1. [Chemical formula 1]
Figure imgf000004_0001
In this case, at least one of Al and A2 is selected from a substituted or non- substituted aromatic group, a heterocyclic group, an aliphatic group, halogen, and hydrogen.
Structures of Al and A2 the same or different. At least one of Al and A2 substituted or non-substituted is selected from phenyl, biphenyl, pyridyl, naphthyl, qumolyl, isoquinolyl, fluorenyl, terphenyl, methyl, ethyl, propyl, isopropyl, and halogen groups.
A substitute of the Al and A2 is at least one selected from aryl, alkyl, aryloxy, alkoxy, arylamino, alkylamino, hydroxyl, ammo, halogen and cyano group. A substitute of the Al and A2 is at least one selected from phenyl, biphenyl, triphenyl, phenylethenyl, diphenylethenyl, phenylethynyl, phenoxy, tolyoxy, vinyl, methyl, ethyl, propyl, isopropyl, t-butyl, cyclohexyl, diphenylamino, carbazolyl, morpholinyl, methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino, fluorine and chlorine group. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Best mode for Carrying Out the Invention
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the 5 drawings to refer to the same or like parts.
In the present invention, a first electrode and a second electrode are formed on a in a vertical direction and a light-emitting layer is formed between the first electrode and the second electrode.
A hole-blocking layer formed between the light- emitting layer and the l o second electrode and using a material of a chemical formula 1. [Chemical formula 1]
Figure imgf000005_0001
In this case, at least one of Al and A2 is selected from a substituted or non- substituted aromatic group, a heterocyclic group, an aliphatic group, a halogen, 15 and hydrogen.
Structures of Al and A2 can be the same or different. Also, at least one of Al and A2 is selected from a substituted or non-substituted phenyl, biphenyl, pyridyl, naphthyl, quinolyl, isoquinolyl, fluorenyl, terphenyl, methyl, ethyl, propyl, isopropyl, and halogen groups. 20 Each substitute of the Al and A2 is at least one selected from aryl, alkyl, aryloxy, alkoxy, arylamino, alkylamino, hydroxyl, amino, halogen and cyano group.
Each substitute of the Al and A2 is at least one selected from phenyl, biphenyl, triphenyl, phenylethenyl, diphenylethenyl, phenylethynyl, phenoxy, tolyoxy, vinyl, methyl, ethyl, propyl, isopropyl, t-butyl, cyclohexyl, diphenylamino, carbazolyl, morpholinyl, methoxy, ethoxy, propoxy, butoxy, dimethylamino, diphenylamino, fluorine and chlorine group.
In this case, at least one of the Al and A2 may be one of the following chemical formulas 2.
[Chemical formula 2]
Figure imgf000006_0001
Figure imgf000006_0002
The material of the hole-blocking layer may be at least one of the following chemical formulas. [Chemical fomiula 3]
Figure imgf000007_0001
Figure imgf000007_0002
Figure imgf000007_0003
Figure imgf000008_0001
Figure imgf000009_0001
Figure imgf000010_0001
Figure imgf000011_0001
According to the organic luminescent device of the present invention, (9- [4-(2,2-diphenyl-vinyl)-phenyl]-10-(4-trityl-phenyl)-anthracene), that is the B-60 used as the hole-blocking layer is compounded as follows. (1) Synthesis of tetraphenylmethyl boronic acid
Figure imgf000012_0001
First of all, 4-Bromotetra phenylmethane (1.62g, 0.005mol) is dissolved in THF (120ml) in a dry 3-necks-r.b.f.. 1.6M of n-BuLi(3.9nιL, 0.006mol) melted in hexane is slowly added to the bath at -78°C for ten minutes and the solution is stirred for 30 minutes at a room temperature.
And, after providing a bath at -78°C, trimethylborate(0.92ml, 0008 lmol) is slowly added into the bath at -78°C and stirred for 12 hours at a room temperature.
Then, about 10% of HC1 is slowly added into the bath at 0°C for making pH 2 or 3, and a resuted solution is extracted by using diethylether and distilled under a reduced pressure.
And, when a deposit is formed by petroleum ether, the solvent is filtered whereby a white solid matter (1.25g, 84%) of tetraphenylmethyl boronic acid is obtained. (2) Synthesis of 9-Bromo-10-(4-trityl-phenyl)-antnracene
Figure imgf000012_0002
First, tetraphenylmethyl boronic acid(1.19g, 0.003mol), 9,10-
DibromoAnthracene(2,74g, 0.008mol), tetrakis(triphenylphosphine) palladium(0)(0.19g, 0.05eq), Potassium carbonate(1.81g, 0.013mol) melted into Toluene(50mL), THF(50mL), and H2O(50mL) are admitted into a two-neck-r.b.f. The solution is heated in a hot oil bath at about 100°C and stirred for 24 hours. When the reaction is finished, THF and toluene are removed.
And, after extracting a resulted solution by using Dichloromethane and water, the resulted solution is distilled under reduced pressure whereby silica gel column is obtained. The solution is re-crystallized by using Dichloromethane and methanol and filtered whereby a yellow solid matter, namely, 9-Bromo-10-(4- trityl-phenyl)-anthracene (0.98g, 53%) is obtained.
(3) Synthesis of (9-[4-(2,2-Diphenyl-vinyl)-phenyl]-10-(4-trityl-phenyl)- anthracene)
Figure imgf000013_0001
9-Bromo-10-(4-trityl-phenyl)-anthracene(0.35g, 0.0006mol), 4-(2,2-
Diphenyl-vinyl)-phenyl boronic acid(0.26g, 0.0009mol), tetrakis(triphenyl- phosphine)palladium(0χ0.035g, 0.05eq), Potassium carbonate(0.25g, 0.002mol) melted into Toluene(30mL), THF(30mL), H2O(30mL) are admitted into a two- neck-r.b.f. The solution is heated in a hot oil bath at about 100°C and stirred for
24 hours. When the reaction is finished, THF and toluene are removed.
Silica gel column is obtained from the resulted solution by using a ratio of Dichloromethane : Hexane = 1 : 50.
The solvent is distilled under reduced pressure whereby a yellow solid matter of 9-Bromo- 10-(4-trityl-phenyl)-anthracene (0.98g, 53%) is obtained.
The solvent is distilled under reduced pressure and filtered by using methanol, whereby a yell solid matter of 9-[4-(2,2-Diphenyl-vinyl)-phenyl]-10-(4- trityl-phenyl)-anthracene (0.42g, 91%) is obtained.
Hereinafter, a preferred embodiment of the organic electroluminescent device will be described according to the present invention.
[Embodiment] An ITO glass is patterned so as to have a size of 2mm x 2mm. The patterned ITO glass is then cleaned.
A substrate is loaded on a vacuum chamber of which basic pressure is set up as lxlO"6 torr and CuPC(200A), NPD(400 A), CBP+(btp)2lr(acac)(8%)(200 A), the hole-blocking layer (100 A), Alq3(300A), LiF(5 A), A1(1000A) are deposited on the ITO in order.
When B-60 is used as the hole-blocking layer, 1135cd/m (9.30V) is shown at about 1mA, brightness shows about 3.2cd/A, whereby CIE is x=0.661, y=0.328.
[Comparative embodiment]
The ITO glass is patterned so as to have a size of 3mm x 3mm. The patterned ITO glass is then cleaned. A substrate is loaded on a vacuum chamber of which basic pressure is set up as 1x10" torr and CuPC(20θA), NPD(40θA)3
CBP+(btp)2lr(acac)(8%)(200A), a light-emitting layer (lOOA), Alq3(30θA),
LiF(5 A), Al(1000 A) are deposited on the ITO in order.
When Balq is used as the hole-blocking layer, 1018cd/m2(9.97V)1135cd/m2(9.30V) is shown at about 1mA, brightness shows about 1018cd/m2(9.97V), whereby CIE ■ x=0.659, y=0.329. Lifetime (half of first brightness) shows 2000cd/m at about 1mA.
Industrial applicability Accordingly, the present invention is the organic elecroluminescent device including the hole-blocking layer between the anode and cathode. The organic elecroluminescent device with enhanced brightness and color purity is obtained through the hole-blocking layer.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

What is claimed is:
1. An organic electi'oluminescent device, comprising: a substrate; a first and second electrodes formed on the substrate; a light-emitting layer formed between the first electrode and the second electrode; and a hole-blocking layer formed between the light- emitting layer and the second electrode and using a material of a chemical formula 1.
[Chemical fomiula]
Figure imgf000016_0001
Wherein, at least one of Al and A2 is selected from a substituted or non- substituted aromatic group, a heterocyclic group, an aliphatic group, halogen, and hydrogen.
2. The organic electroluminescent device of claim 1, wherein structures of Al and A2 are the same or different each other.
3. The organic electroluminescent device of claim 1, wherein at least one of Al and A2 is selected from phenyl, biphenyl, pyridyl, naphthyl, quinolyl, isoquinolyl, fluorenyl, terphenyl, methyl, ethyl, propyl, isopropyl, and halogen groups.
4. The organic electroluminescent device of claim 3, wherein a substitute of the Al and A2 is at least one selected from aryl, alkyl, aryloxy, alkoxy, arylamino, alkylamino, hydroxyl, amino, halogen and cyano group.
5. The organic electroluminescent device of claim 4, wherein a substitute of the Al and A2 is at least one selected from phenyl, biphenyl, triphenyl, phenylethenyl, diphenylethenyl, phenylethynyl, phenoxy, tolyoxy, vinyl, methyl, ethyl, propyl, isopropyl, t-butyl, cyclohexyl, diphenylamino, carbazolyl, morpholinyl, methoxy, ethoxy, propoxy, butoxy, dimethylammo, diphenylamino, fluorine and chlorine group.
6. The organic electroluminescent device of claim 1 , wherein at least one of the Al and A2 is one of the following chemical formulas 2.
Figure imgf000018_0001
Figure imgf000018_0002
Figure imgf000018_0003
Figure imgf000018_0004
Figure imgf000018_0005
7. The organic electroluminescent device of claim 1, wherein a material of the hole-blocking layer is one of the following chemical formulas 3.
Figure imgf000019_0001
Figure imgf000019_0002
Figure imgf000019_0003
Figure imgf000019_0004
Figure imgf000020_0001
Figure imgf000021_0001
Figure imgf000022_0001
Figure imgf000023_0001
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