Organic electroluminescent device

• US 6,555,254 B1
• Filed: 12/06/1999
• Issued: 04/29/2003
• Est. Priority Date: 12/09/1998
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Tamura, Shinichiro, Ishibashi, Tadashi, Ichimura, Mari
• Primary Examiner(s): Jones, Deborah
• Assistant Examiner(s): XU, LING X
• Application Number:
  US09/455,322
• Time in Patent Office: 1,240 Days
• Field of Search: 428/690, 428/917, 428/704, 313/504, 313/506
• US Class Current: 428/690
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescent device comprises an organic layer 5, 5a or 5b having a luminescent region and provided between an anode 2 and a cathode 3. The organic layer contains at least one distyryl compound represented by the following general formula (1).

General formula (1):

wherein R¹ and R2 are, respectively, groups which may be the same or different and independently represent an aryl group of the following general formula (2).

General formula (2):

in which R⁴ to R⁸ may be the same or different and, respectively, represent a hydrogen atom, or at least one of them is a specified group such as a methoxy group, R³ represents a hydrogen atom or a specified group, and X represents a substituted or unsubstituted aryl group or hydrocarbon ring group.

Claims

1. An organic electroluminescent device which comprises an organic layer having luminescent region and provided between an anode and a cathode, wherein said organic layer comprises, as an organic luminescent material, at least one distyryl compound of the following general formula (1)

General Formula (1):

wherein R¹ and R² are, respectively, groups which may be the same or different and independently represent an aryl group of the following general formula (2)

General Formula (2);

in which R⁴, R⁵, R⁶, R⁷ and R⁸ may be the same or different and, respectively, represent a hydrogen atom, or at least one of them is a saturated or unsaturated alkoxyl group, an alkyl group, an amino group, an alkylamino group or an aryl group, R³ represents a hydrogen atom, a saturated or unsaturated alkoxyl group, an alkyl group, an amino group, an alkylamino group or an aryl group and X represents a group of the following general formula (3)

General Formula (3);

wherein R⁹, R¹⁰, R¹¹, and R¹² may be the same or different and independently represent a hydrogen atom, a cyano group, a nitro group or a halogen atom, and at least one of them represents a cyano group, a nitro group or a halogen atom.

2. An organic electroluminescent device according to claim 1, wherein said organic layer has an organic built-up structure wherein a hole transport layer and an electron transport layer are built up, and said distyryl compound is used as a material for forming said hole transport layer.

3. An organic electroluminescent device according to claim 1, wherein said organic layer has an organic built-up structure wherein a hole transport layer and an electron transport layer are successively built up, and said distyryl compound is used as a material for forming said electron transport layer.

4. An organic electroluminescent device according to claim 1, wherein said organic layer has an organic built-up structure wherein a hole transport layer, a luminescent layer, and an electron transport layer are built up, and said distyryl compound is used as a material for forming said luminescent layer.