Organic light emitting element and method of producing the same

• US 6,909,232 B2
• Filed: 09/03/2004
• Issued: 06/21/2005
• Est. Priority Date: 12/04/1996
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Shimada, Akira, Kobayashi, Shinya, Nakayama, Takahiro
• Primary Examiner(s): WILLIAMS, JOSEPH L
• Application Number:
  US10/933,254
• Publication Number:
  US 20050035706A1
• Time in Patent Office: 291 Days
• Field of Search: 313/504, 313/506, 313/512, 313/505, 313/501, 313/503
• US Class Current: 313/504
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/872 Containers
• CPC Class Codes: H10K 59/875 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/878 comprising reflective means
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine

Abstract

An organic light emitting element comprising a substrate and a translucent reflection film, a transparent electrode, a hole transport layer, a light emitting layer and a metal electrode layered on the substrate in that order. At least the hole transport layer, the light emitting layer and the metal electrode are covered with an insulating film and a metal reflection film.

Claims

1. An organic light emitting element comprising a substrate and a translucent reflection film, a transparent electrode, a hole transport layer, a light emitting layer and a metal electrode layered on the substrate in that order, wherein at least the hole transport layer, the light emitting layer and the metal electrode are covered with an insulating film and a metal reflection film.

2. An organic light emitting element according to claim 1, wherein the transparent electrode includes a stepped portion having an upper surface with the hole transparent layer being layered thereon, the hole transparent layer having an upper surface with the light emitting layer being layered thereon, and the light emitting layer having an upper surface with the metal electrode being layered thereon, wherein the insulating film covers at least side surfaces of the stepped portion of the transparent electrode, the hole transparent layer, the light emitting layer and the metal electrode layer and an upper surface of the metal electrode layer, the metal reflection film being formed on the insulating film.

3. An organic light emitting element comprising a substrate and a translucent reflection film, a transparent electrode, a hole transport layer, a light emitting layer and a metal electrode layered on the substrate in that order, the organic light emitting element further comprising an insulating film formed on the transparent electrode, the hole transparent layer, the light emitting layer and the metal electrode, and a metal reflection film formed on the insulating film.

4. An organic light emitting element according to claim 3, wherein the transparent electrode includes a stepped portion having an upper surface with the hole transparent layer being layered thereon, the hole transparent layer having an upper surface with the light emitting layer being layered thereon, and the light emitting layer having an upper surface with the metal electrode being layered thereon, wherein the insulating film covers at least side surfaces of the stepped portion of the transparent electrode, the hole transparent layer, the light emitting layer and the metal electrode layer and an upper surface of the metal electrode layer, the metal reflection film being formed on the insulating film.