Organic electroluminescence device with light and dark blue emitting layers

• US 7,064,481 B2
• Filed: 02/13/2004
• Issued: 06/20/2006
• Est. Priority Date: 10/29/2003
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Ko, Chung-Wen
• Primary Examiner(s): Williams, Joseph
• Assistant Examiner(s): QUARTERMAN, KEVIN J
• Application Number:
  US10/708,176
• Publication Number:
  US 20050093433A1
• Time in Patent Office: 858 Days
• Field of Search: 313/498, 313/502, 313/503, 313/504, 313/506, 313/512
• US Class Current: 313/504
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light

Abstract

An organic electroluminescent device is provided. The device includes a substrate, an anode, an emitting layer and a cathode. The anode is disposed on the substrate, the emitting layer is disposed on the anode, and the cathode is disposed on the emitting layer. The emitting layer is constructed by a dark-blue emitting layer/light-blue emitting layer/reddish orange emitting layer or a light-blue emitting layer/dark-blue emitting layer/reddish orange emitting layer. Since the dark-blue emitting layer has an excellent bright blue light color and high brightness, and the light-blue emitting layer has a long service life, and therefore, organic electroluminescent device of the present invention has an excellent blue light color, high brightness and long service life.

Claims

1. An organic electroluminescent device, comprising:

an anode, disposed on a substrate;

an emitting layer, disposed on the anode, wherein the emitting layer comprises a blue emitting layer and a reddish orange emitting layer, and wherein the blue emitting layer comprises a dark-blue emitting layer and a light-blue emitting layer; and

a cathode, disposed on the emitting layer.

2. The organic electroluminescent device of claim 1, wherein the blue emitting layer is disposed on the anode, and the reddish orange emitting layer is disposed between the blue emitting layer and the cathode.

3. The organic electroluminescent device of claim 2, wherein the dark-blue emitting layer is disposed on the anode, and the light-blue emitting layer is disposed between the dark-blue emitting layer and the reddish orange emitting layer.

4. The organic electroluminescent device of claim 2, wherein the light-blue emitting layer is disposed on the anode, and the dark-blue emitting layer is disposed between the light-blue emitting layer and the reddish orange emitting layer.

5. The organic electroluminescent device of claim 1, wherein the reddish orange emitting layer is disposed on the anode, and the blue emitting layer is disposed between the reddish orange emitting layer and the cathode.

6. The organic electroluminescent device of claim 5, wherein the dark-blue emitting layer is disposed on the reddish orange emitting layer, and the light-blue emitting layer is disposed between the dark-blue emitting layer and the cathode.

7. The organic electroluminescent device of claim 5, wherein the light-blue emitting layer is disposed on the reddish orange emitting layer, and the dark-blue emitting layer is disposed between the light-blue emitting layer and the cathode.