Organic electroluminescent devices

• US 6,423,429 B2
• Filed: 02/25/1999
• Issued: 07/23/2002
• Est. Priority Date: 03/02/1998
• Status: Expired due to Term

• Current Assignee: Junji Kido, ROHM Co., Ltd.
• Original Assignee: International Manufacturing And Engineering Services Company Limited, Junji Kido
• Inventors: Kido, Junji, Mizukami, Tokio, Endoh, Jun
• Primary Examiner(s): Kelly, Cynthia H.
• Assistant Examiner(s): GARRETT, DAWN L
• Application Number:
  US09/257,778
• Publication Number:
  US 20010046611A1
• Time in Patent Office: 1,244 Days
• Field of Search: 428/690, 428/917, 313/502, 313/503, 313/504, 313/506
• US Class Current: 428/690
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/17 Carrier injection layers
• 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 electroluminescent device includes at least one light emission layer from an organic compound, the light emission layer being positioned between an anode electrode and a cathode electrode opposed to the anode electrode, in which an organic layer positioned adjacent to the anode electrode is from an organic compound which includes, as an electron-accepting dopant, an electron-accepting compound having a property of oxidizing the organic compound of said organic layer, said electron-accepting compound being doped to said organic layer in vacuum with a simultaneous evaporation method.

Claims

1. An organic electroluminescent device comprising at least one light emission layer made from at least one organic compound, the light emission layer being positioned between an anode electrode and a cathode electrode opposed to the anode electrode, and a hole injection layer positioned adjacent to the anode electrode, said hole injection layer being made from at least one organic compound doped with a dopant, said dopant having a property of oxidizing the at least one organic compond of said hole injection layer through Lewis acid chemistry, by vacuum co-deposition of said dopant and said at least one organic compound of said hole injection layer.

2. The organic electroluminescent device according to claim 1, in which said dopant comprises an inorganic compound.

3. The organic electroluminescent device according to claim 1, in which said dopant comprises at least one Lewis acid compound selected from the group consisting of ferric chloride, aluminum chloride, gallium chloride, indium chloride and antimony pentachloride.

4. The organic electroluminescent device according to claim 1, in which said dopant comprises an organic compound.

5. The organic electroluminescent device according to claim 1, in which a molar ratio of the dopant to the at least one organic compound of said hole injection layer is in the range of 0.1 to 10.

6. The organic electroluminescent device according to claim 1, in which a total thickness of said hole injection layer is more than 2000 Å

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