TANDEM OLED DEVICE WITH INTERMEDIATE CONNECTOR

• US 20090191428A1
• Filed: 01/30/2008
• Published: 07/30/2009
• Est. Priority Date: 01/30/2008
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Spindler, Jeffrey P., Hatwar, Tukaram K., Begley, William J.
• Granted Patent: US 7,955,719 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 50/171 Electron injection layers
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 71/30 Doping active layers, e.g. electron transporting layers
• CPC Class Codes: H10K 85/30 Coordination compounds
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

A tandem OLED device including an anode; a cathode; at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer; and an intermediate connector disposed between adjacent electroluminescent units, wherein the intermediate connector includes an n-doped organic layer and an electron-accepting layer, the electron-accepting layer being disposed closer to the cathode than the n-doped organic layer, and wherein the n-doped organic layer includes an alkali metal and an organic alkali metal complex.

Claims

1. A tandem OLED device comprising:

(a) an anode;

(b) a cathode;

(c) at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer; and

(d) an intermediate connector disposed between adjacent electroluminescent units, wherein the intermediate connector includes an n-doped organic layer and an electron-accepting layer, the electron-accepting layer being disposed closer to the cathode than the n-doped organic layer, and wherein the n-doped organic layer includes an alkali metal and an organic alkali metal complex.

2. The tandem OLED device of claim 1 wherein the organic alkali metal complex includes a phenanthroline derivative.

3. The tandem OLED device of claim 2 wherein the alkali metal is lithium.

4. The tandem OLED device of claim 3 wherein the organic alkali metal complex includes lithium.

5. The tandem OLED device of claim 4 wherein the n-doped organic layer further includes an uncharged phenanthroline derivative.

6. The tandem OLED device of claim 1 wherein the organic alkali metal complex includes a chemical compound according to the following formula:

7. The tandem OLED device of claim 1 wherein intermediate connector further includes an undoped layer in contact with the n-doped layer and closer to the anode than the cathode.

8. The tandem OLED device of claim 7 wherein the undoped layer includes an anthracene derivative.

9. The tandem OLED device of claim 8 wherein the undoped layer further includes an organic alkali metal complex.

10. The tandem OLED device of claim 9 wherein the organic alkali metal complex in the undoped layer is a salt of hydroxyquinoline.

11. The tandem OLED of claim 1 wherein the electron-accepting layer includes a hexaazatriphenylene derivative.