ORGANIC ELECTROLUMINESCENCE ELEMENT

• US 20090066228A1
• Filed: 05/08/2006
• Published: 03/12/2009
• Est. Priority Date: 05/11/2005
• Status: Abandoned Application

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Kuma, Hitoshi, Inoue, Kazuyoshi, Tomai, Shigekazu
• Application Number:
  US11/913,272
• Publication Number:
  US 20090066228A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

An organic electroluminescent device (1) including: a transparent electrode (12); a counter electrode (14) opposite to the transparent electrode (12); and one or more multilayered structures between the transparent electrode (12) and the counter electrode (14), the structure including two organic emitting layers (20) and (22) and an intermediate conductive layer (30) between the organic emitting layers (20) and (22), the refractive index n_a of the intermediate conductive layer (30) being different from the refractive index n_b of at least one of the organic emitting layers by 0.25 or less, the intermediate conductive layer (30) containing an oxide containing one or more types of rare earth elements.

Claims

1. An organic electroluminescent device comprising:

a transparent electrode;

a counter electrode opposite to the transparent electrode; and

at least one multilayered structure between the transparent electrode and the counter electrode, the structure comprising two organic emitting layers and an intermediate conductive layer between the organic emitting layers, a refractive index n_a of the intermediate conductive layer being different from a refractive index n_b of at least one of the organic emitting layers by 0.25 or less, the intermediate conductive layer containing an oxide containing one or more types of rare earth elements.

2. The organic electroluminescent device of claim 1 wherein the intermediate conductive layer is a multilayered body of a layer having a refractive index larger than the refractive index n_b and a layer having a refractive index smaller than the refractive index n_b.

3. The organic electroluminescent device of claim 1 wherein the intermediate conductive layer is formed from a mixture of a material having a refractive index larger than the refractive index n_b and a material having a refractive index smaller than the refractive index n_b.

7. The organic electroluminescent device of claim 2 wherein the intermediate conductive layer is a multilayered body of a transparent conductive material and a metal halide.

8. The organic electroluminescent device of claim 7 wherein the transparent conductive material comprises an oxide containing at least one element selected from Ce, Nd, Sm and Gd and at least one element selected from In, Zn and Sn.

9. The organic electroluminescent device of claim 3 wherein the intermediate conductive layer is a mixture film of a transparent conductive material and a metal halide.

10. The organic electroluminescent device of claim 9 wherein the transparent conductive material comprises an oxide containing at least one element selected from Ce, Nd, Sm and Gd and at least one element selected from In, Zn and Sn.

11. The organic electroluminescent device of claim 1 wherein the intermediate conductive layer has an absorption coefficient of 2.5 [1/μ

m] or less.

12. The organic electroluminescent device of claim 2 wherein the intermediate conductive layer has an absorption coefficient of 2.5 [1/μ

m] or less.

13. The organic electroluminescent device of claim 3 wherein the intermediate conductive layer has an absorption coefficient of 2.5 [1/μ

m] or less.

4-6. -6. (canceled)