Electroluminescent device

• US 5,122,711 A
• Filed: 09/05/1989
• Issued: 06/16/1992
• Est. Priority Date: 02/17/1989
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Wakimoto, Takeo, Nakada, Hitoshi, Shinkai, Masanao
• Primary Examiner(s): DEMEO, PALMER
• Application Number:
  US07/402,579
• Time in Patent Office: 1,015 Days
• Field of Search: 313/504
• US Class Current: 313/504
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: 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

Abstract

An electroluminescent device comprising a fluophor luminescent layer and a hole transport layer respectively composed of organic compounds and laminated to each other disposed between a cathode and an anode, said fluophor luminescent layer comprising a pair of fluophor thin films laminated in each other, the material of the cathode-side film having a larger electron transport capacity than the material of the anode-side film.

Claims

1. An electroluminescent device comprising a fluophor luminescent layer and a hole transport layer respectively composed of organic compounds and laminated to each other disposed between a cathode and an anode, said fluophor luminescent layer comprising a pair of fluophor thin films laminated on each other, the material of the cathode-side fluophor luminescent thin film having a larger electron transport capacity than the material of the anode-side fluophor luminescent thin film.

2. An electroluminescent device according to claim 1, wherein the cathode-side fluophor luminescent thin film comprises a film of a metal complex of 8-hydroxyquinoline.

3. An electroluminescent device according to claim 2, wherein the anode-side fluophor luminescent thin film comprises a film of a member selected from the group consisting of coumarin 540, coumarin 515, coumarin 535, LUMOGEN F ORANGE 240, and 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran.

4. An electroluminescent device according to claim 1, wherein the cathode-side fluophor luminescent thin film comprises a film of LUMOGEN F YELLOW 083.

5. An electroluminescent device according to claim 4, wherein the anode-side fluophor luminescent thin film comprises a film of a metal complex of 8-hydroxyquinoline.