Organic EL device having a hole injecting electrode including a transparent electrode and a metal electrode

• US 6,320,311 B2
• Filed: 07/08/1998
• Issued: 11/20/2001
• Est. Priority Date: 07/09/1997
• Status: Expired due to Term

• Current Assignee: Futaba Corporation
• Original Assignee: TDK Corporation
• Inventors: Nakaya, Kenji, Codama, Mitsufumi
• Primary Examiner(s): Patel, Ashok
• Assistant Examiner(s): Santiago, Mariceli
• Application Number:
  US09/111,178
• Publication Number:
  US 20010026126A1
• Time in Patent Office: 1,231 Days
• Field of Search: 313/498, 313/500, 313/504, 313/503, 313/506, 313/507, 313/311, 313/505, 313/509, 313/510, 428/690, 428/917, 315/169.3
• US Class Current: 313/506
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H05B 33/28 of translucent electrodes
• CPC Class Codes: H10K 50/814 combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
• CPC Class Codes: H10K 59/10 OLED displays
• CPC Class Codes: H10K 59/1795 comprising structures specially adapted for lowering the resistance

Abstract

An organic EL device comprises a hole injecting electrode, an electron injecting electrode, and at least one organic layer located between both the electrodes. The hole injecting electrode comprises a transparent electrode at a light emitting area, and a metal electrode located at a portion other than the light emitting area and having a sheet resistance of 1 Ω/□ or lower.

Claims

1. An organic electroluminescent device comprising a hole injecting electrode, an electron injecting electrode, and at least one organic layer interleaved between both said electrodes, wherein:

said hole injecting electrode comprises a transparent electrode at a light emitting area, and a metal electrode located at a portion other than said light emitting area and connected to said transparent electrode, and having a sheet resistance of 1 Ω

/□

or lower, wherein said metal electrode is connected to all the peripheral area of the transparent electrode, and wherein an insulating layer is provided on the metal electrode for insulation of the portion other than the light emitting area.

2. The organic electroluminescent device of claim 1, wherein said transparent electrode has a thickness of 100 nm or less.

3. The organic electroluminescent device of claim 1, wherein said transparent electrode is an ITO transparent electrode.

4. The organic electroluminescent device of claim 1, wherein said transparent electrode is an IZO transparent electrode.

5. The organic electroluminescent device of claim 1, which further includes a barrier layer between said transparent electrode and said metal electrode.

6. The organic electroluminescent device of claim 1, wherein said metal electrode overlaps the transparent electrode at the periphery thereof.

7. A segment type display comprising the organic electroluminescent device of claim 6.

8. A simple matrix type display comprising the organic electroluminescent device of claim 6.