Stabilized OLED device

• US 20050058852A1
• Filed: 09/12/2003
• Published: 03/17/2005
• Est. Priority Date: 09/12/2003
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Tyan, Yuan-Sheng, Shore, Joel D., Hatwar, Tukaram K., Farruggia, Giuseppe
• Granted Patent: US 6,905,788 B2
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

A stabilized OLED device for emitting light of a specific color includes a metallic anode and a metallic cathode spaced from the metallic anode. The device also includes a light-emitting layer including a host and a dopant, the dopant selected to produce light having a spectrum including light of the specific color, and a stabilizer provided in one of the device layers which improves the useful lifetime of the OLED device, wherein the stabilizer has an emission spectrum different from that of the light-emitting layer. One of the electrode layers is semitransparent and the other one is substantially opaque and reflective such that the stabilized OLED device forms a microcavity that emits a narrow band light with the specific color.

Claims

1. A stabilized OLED device for emitting light of a specific color, comprising:

a) a metallic anode and a metallic cathode spaced from the metallic anode;

b) a light-emitting layer including a host and a dopant disposed between the anode and the cathode, the dopant selected to produce light having a spectrum containing light of the specific color;

c) a stabilizer provided in one of the device layers which improves the useful lifetime of the OLED device, wherein the stabilizer has an emission spectrum different from that of the light-emitting layer, and

d) wherein one of the electrode layers is semitransparent and the other one is substantially opaque and reflective such that the stabilized OLED device forms a microcavity that emits a narrow blue_band light.

2. The OLED device of claim 1 wherein material for the semitransparent electrode layer includes Ag or Au, or alloys thereof.

3. The OLED device of claim 1 wherein the material for the reflective electrode layer includes Ag, Au, Al, Mg, or Ca, or alloys thereof.

4. The OLED device of claim 1 further including a hole-transporting layer disposed between the anode and the cathode.

5. The OLED device of claim 1 wherein the OLED device includes a hole-transporting layer and the stabilizer is provided in the light-emitting layer or the hole-transporting layer or both.

6. The OLED device according to claim 1 further including an electron-transporting layer and a hole-transporting layer and wherein the stabilizer is provided in such electron-transporting layer or in the light-emitting layer or in the hole-transporting layer.

7. The OLED device according to claim 1 wherein the dopant produces blue light.

8. A color-conversion OLED device comprising:

a) a metallic anode and a metallic cathode spaced from the metallic anode;

b) a light-emitting layer including a host and a dopant disposed between the anode and the cathode, the dopant selected to produce blue light;

c) a stabilizer provided in one of the device layers which improves the useful lifetime of the OLED device, wherein the stabilizer has an emission spectrum different from that of the light-emitting layer;

d) wherein one of the electrode layers is semitransparent and the other one is substantially opaque and reflective such that the stabilized OLED device forms a microcavity that emits a narrow blue band light; and

e) a color conversion layer including fluorescent material responsive to the blue light to re-emit a different colored light.

9. A color-conversion OLED device of claim 8 wherein material for the semitransparent electrode layer includes Ag or Au, or alloys thereof.

10. The color-conversion OLED device of claim 8 wherein the material for the reflective electrode layer includes Ag, Au, Al, Mg, or Ca, or alloys thereof.