Organic electroluminescent device having an azatriphenylene derivative

• US 7,914,908 B2
• Filed: 11/02/2007
• Issued: 03/29/2011
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Zheng, Shiying, Liao, Liang-Sheng
• Primary Examiner(s): GARRETT, DAWN L
• Application Number:
  US11/934,258
• Publication Number:
  US 20090115316A1
• Time in Patent Office: 1,243 Days
• Field of Search: None
• US Class Current: 428/690
• CPC Class Codes: C07D 471/14 Ortho-condensed systems
• CPC Class Codes: C08G 73/0688 with only one nitrogen atom in the ring, e.g. polyquinolines
• CPC Class Codes: C08L 79/04 Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: C09D 179/04 Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

Azatriphenylene derivatives and their use in the electron-transporting layer of an electroluminescent device that comprises an anode, a spaced-apart cathode, and at least one electron-transporting layer disposed between the spaced-apart anode and cathode. Such EL devices provide lower drive voltage, improved power efficiency, and longer operational lifetime.

Claims

1. An organic compound represented by one of the following formulae:

2. An organic polymer comprising an azatriphenylene structure represented by the formula:

3. An electroluminescent device comprises an anode, a spaced-apart cathode, and at least one electron-transporting layer disposed between the spaced-apart anode and cathode, the electron-transporting layer including a polymer having a structure in accordance with Formula I as a part of a repeating unit:

4. The electroluminescent device of claim 3 wherein X1 and X17 are nitrogen atoms or X1 and X14 are nitrogen atoms.

5. The electroluminescent device of claim 4 wherein X8 or X11 are nitrogen.

7. The electroluminescent device of claim 3 wherein the electron-transporting layer is doped with at least one dopant having a work function less than 4.0 eV.

8. The electroluminescent device of claim 7 wherein the at least one dopant in the electron-transporting layer includes alkali metals, alkali metal compounds, alkaline earth metals, or alkaline earth metal compounds.

9. The electroluminescent device of claim 7 wherein the at least one dopant in the electron-transporting layer includes Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, La, Ce, Nd, Sm, Eu, Tb, Dy, or Yb.

6. An electroluminescent device comprises an anode, a spaced-apart cathode, and at least one electron-transporting layer disposed between the spaced-apart anode and cathode, the electron-transporting layer including a compound represented by one of the following formulae:

10. A method of making an electroluminescent device, comprising:

a) providing an anode and a spaced-apart cathode; and

b) depositing between the anode and spaced-apart cathode at least one electron-transporting layer, which includes a polymer having a structure in accordance with Formula I as a part of a repeating unit;

11. An organic material for use in an electronic device wherein the material is a polymer having a structure in accordance with Formula I as a part of a repeating unit: