Tandem white OLED with efficient electron transfer

• US 8,283,054 B2
• Filed: 04/03/2009
• Issued: 10/09/2012
• Est. Priority Date: 04/03/2009
• 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.
• Primary Examiner(s): Garrett, Dawn L.
• Application Number:
  US12/417,883
• Publication Number:
  US 20100253209A1
• Time in Patent Office: 1,285 Days
• Field of Search: 428/690, 428/917, 313/504, 313/506
• US Class Current: 428/690
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 85/30 Coordination compounds
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• 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 white-light-emitting tandem OLED device having spaced anode and cathode including: first and second light-emitting units disposed between the anode and cathode; an intermediate connector including an n-type layer and a p-type layer disposed between the first and second light-emitting units; and a fluoranthene-containing electron-transporting layer adjacent to the n-type layer of the intermediate connector and including at least 25% of a 7,10-diaryl-substituted fluoranthene compound having no aromatic rings annulated to the fluoranthene nucleus.

Claims

1. A white-light-emitting tandem OLED device having spaced anode and cathode comprising:

a. first and second light-emitting units disposed between the cathode and anode;

b. an intermediate connector comprising an n-type layer and a p-type layer disposed between the first and second light-emitting units; and

c. a fluoranthene-containing electron-transporting layer adjacent to the n-type layer of the intermediate connector and comprising at least 25% of a 7,10-diaryl-substituted fluoranthene compound having no aromatic rings annulated to the fluoranthene nucleus.

2. The tandem OLED device of claim 1 wherein the n-type layer is a lithium-doped layer.

3. The tandem OLED device of claim 1 further including a second electron-transporting layer adjacent to the cathode and a second fluoranthene-containing electron-transporting layer adjacent to the second electron-transporting layer.

4. The tandem OLED device of claim 3 wherein the n-type layer, or the electron-transporting layer, or both are lithium-doped.

5. The tandem OLED of claim 1 wherein the fluoranthene compound is according to Formula (I):

6. The tandem OLED device of claim 5 wherein the fluoranthene compound is according to Formula (II):

7. The tandem OLED device of claim 6 wherein the fluoranthene compound is according to Formula (III-a) or (III-b):

8. The tandem OLED device of claim 1 wherein one of the light-emitting units emits light in the blue region of the visible spectrum and the other light-emitting unit emits light in the red to green region of the visible spectrum.

9. The tandem OLED device of claim 1 further including a second electron-transporting layer adjacent to the cathode.

10. The tandem OLED device of claim 1 wherein each of the light-emitting units comprises a hole transporting layer.

11. The tandem OLED device of claim 1 further comprising a hole injection layer adjacent to the anode.

12. The tandem OLED device of claim 6 wherein at least one of the light-emitting units include an anthracene derivative having hydrocarbon or substituted hydrocarbon substituents at the 9 and 10 positions.

13. The tandem OLED device of claim 6 wherein the anthracene derivative is according to Formula B:

14. The tandem OLED device of claim 6 wherein the fluoranthene compound is according to any of Formulas ETM1-ETM21: