# US 7,745,988 B2 · 3, 6-diphenylcarbazole compound and organic electroluminescent device

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- Number: US 7,745,988 B2
- Document ID: US7745988B2
- Status: Granted
- Kind: B2
- Application number: 10/933,230
- Filed: 2004-09-03
- Published: 2005-04-21
- Granted: 2010-06-29
- Earliest claimed: 2003-09-05
- Assignees: Ricoh Company, Ltd.
- Inventors: Masaomi Sasaki; Masafumi Torii; Toshiya Sagisaka; Takashi Okada; Shinichi Kawamura; Chihaya Adachi; Yuuichiroh Kawamura; Kenji Muneuchi
- Web page: https://patentgrep.com/patent/US7745988B2

## CPC

- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- C07D 209/86: with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the ring system
- C09K 11/06: containing organic luminescent materials
- H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source}
- C09K 2211/1029: containing one nitrogen atom as the heteroatom
- H10K 85/324: {comprising aluminium, e.g. Alq3}
- H10K 85/342: {comprising iridium}
- H10K 2102/103: {comprising indium oxides, e.g. ITO}
- Y10S 428/917: Electroluminescent
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A 3,6-diphenylcarbazole compound, which has a specific formula and realizes an organic electroluminescent device having high durability and high luminous efficiency. An electroluminescent device which includes an anode; a cathode which faces the anode; and at least one layer including a luminescent layer, optionally a hole transporting layer and an electron transporting layer, which is located between the anode and the cathode, wherein the at least one layer includes the 3,6-diphenylcarbazole compound.

## Claims

### Claim 1

An organic electroluminescent device comprising:
an anode;
a cathode which faces the anode; and
at least one layer including a luminescent layer that comprises a phosphorescent dopant and is located between the anode and the cathode,
wherein the at least one layer includes a 3,6-diphenylcarbazole compound represented by the following formula (II) that can serve as a host material for a guest material:
wherein R1 and R2 are 4-phenyl groups, R5 represents a phenyl group or a biphenyl group substituted only with one or more groups selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxy group and a combination thereof, and R3 and R4 independently represent a hydrogen atom or an unsubstituted aryl group,
wherein the at least one layer includes a hole transporting layer, the luminescent layer, and an electron transporting layer, which are overlaid in this order.

### Claim 2 (depends on 1)

The organic electroluminescent device according to claim 1, wherein the phosphorescent dopant is an iridium complex.

### Claim 3 (depends on 2)

The organic electroluminescent device according to claim 2, wherein the iridium complex is tris(2-phenylpyridine)iridium.

### Claim 4 (depends on 1)

The organic electroluminescent device according to claim 1, wherein R5 is a phenyl group substituted only with one or more groups selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxy group and a combination thereof.

### Claim 5 (depends on 1)

The organic electroluminescent device according to claim 1, wherein R5 is a biphenyl group substituted only with one or more groups selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxy group and a combination thereof.

### Claim 6 (depends on 1)

The organic electroluminescent device according to claim 1, wherein R5 is a phenyl group.

### Claim 7 (depends on 1)

The organic electroluminescent device according to claim 1, wherein R5 is a biphenyl group.

### Claim 8 (depends on 1)

The organic electroluminescent device according to claim 1, wherein R5 is a 4-methoxyphenyl or a 3-methoxyphenyl group.

### Claim 9 (depends on 1)

The organic electroluminescent device according to claim 1, wherein R3 and R4 are hydrogen atoms; and R5 is at least one selected from the group consisting of a methylphenyl group, a biphenyl group, a methoxyphenyl group, and a phenyl group.

### Claim 10 (depends on 1)

The organic electroluminescent device according to claim 1, wherein R1 and R2 are 4-phenyl groups and R5 is a phenyl group.