TANDEM OLED DEVICE WITH INTERMEDIATE CONNECTOR

• US 20090195146A1
• Filed: 01/31/2008
• Published: 08/06/2009
• Est. Priority Date: 01/31/2008
• 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 7,821,201 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 85/322 comprising boron
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

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 of at least two layers disposed between adjacent electroluminescent units, wherein the intermediate connector includes an organic alkali metal complex layer and an organic electron-accepting layer, the organic electron-accepting layer being disposed closer to the cathode than the organic alkali metal complex layer, and there is present metallic aluminum in the organic alkali metal complex layer.

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 of at least two layers disposed between adjacent electroluminescent units, wherein the intermediate connector includes an organic alkali metal complex layer and an organic electron-accepting layer, the organic electron-accepting layer being disposed closer to the cathode than the organic alkali metal complex layer, and there is present metallic aluminum in the range of from 0.2 to 5% in the organic alkali metal complex layer.

2. The tandem OLED device of claim 1 wherein the metallic aluminum is present in the range of from 0.5 to 2%.

3. The tandem OLED device of claim 1 wherein the organic alkali metal complex layer includes an organic alkali metal complex and an aromatic hydrocarbon compound.

4. The tandem OLED device of claim 3 wherein the organic alkali metal complex is a salt of hydroxyquinoline.

5. The tandem OLED device of claim 3 wherein the hydrocarbon compound is a rubrene derivative.

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

7. 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 of at least two layers disposed between adjacent electroluminescent units, wherein the intermediate connector includes an organic alkali metal complex layer and an organic electron-accepting layer, the organic electron-accepting layer being disposed closer to the cathode than the organic alkali metal complex layer, and there is present metallic aluminum in a layer of from 0.1 to 2 nm thickness between the organic alkali metal complex layer and the organic electron-accepting layer.

8. The tandem OLED device of claim 7 wherein the metallic aluminum forms a layer of from 0.2 to 2 nm thickness.

9. The tandem OLED device of claim 7 wherein the organic alkali metal complex layer includes an organic alkali metal complex and an aromatic hydrocarbon compound.

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

11. The tandem OLED device of claim 9 wherein the hydrocarbon compound is a rubrene derivative.

12. The tandem OLED of claim 7 wherein the organic electron-accepting layer includes a hexaazatriphenylene derivative.

13. The tandem OLED of claim 7 wherein there is further present metallic aluminum in the range of from 0.2 to 5% in the organic alkali metal complex layer.