Organic electroluminescence device

• US 20070205411A1
• Filed: 03/02/2007
• Published: 09/06/2007
• Est. Priority Date: 03/06/2006
• Status: Active Grant

• Current Assignee: UDC Ireland Limited
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Itai, Yuichiro
• Granted Patent: US 8,017,254 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescence device of multi-photon emission mode which includes plural light emission layers and at least one charge generation layer between a pair of electrodes, arranged in a film thickness direction thereof, wherein the charge generation layer includes at least one p-doped layer and at least one n-doped layer, and further includes an alkali metal layer and a layer containing a hole transport material between the p-doped layer and the n-doped layer. An organic electroluminescence device of multi-photon emission mode exhibiting little unevenness in luminance even in a large-area format electroluminescence device is provided.

Claims

1. An organic electroluminescence device of multi-photon emission mode which comprises plural light emission layers and at least one charge generation layer between a pair of electrodes, arranged in a film thickness direction thereof, wherein the charge generation layer includes at least one p-doped layer and at least one n-doped layer, and further includes an alkali metal layer and a layer containing a hole transport material between the p-doped layer and the n-doped layer.

2. An organic electroluminescence device according to claim 1, wherein the charge generation layer includes the p-doped layer, the alkali metal layer, the layer containing the hole transport material and the n-doped layer arranged in this order.

3. An organic electroluminescence device according to claim 1, wherein the alkali metal layer contains Li, Na, K, Rb or Cs.

4. An organic electroluminescence device according to claim 3, wherein the alkali metal layer contains Li.

5. An organic electroluminescence device according to claim 1, wherein the layer containing the hole transport material contains an aromatic tertiary amine compound.

6. An organic electroluminescence device according to claim 5, wherein the layer containing the hole transport material contains 4,4′

,4″

-tri-(2-naphthylphenylamino)-triphenylamine.

7. An organic electroluminescence device according to claim 6, wherein the alkali metal layer contains Li.

8. An organic electroluminescence device according to claim 1, wherein the p-doped layer contains an arylamine compound represented by the following formula (I):

wherein Ar1, Ar2 and Ar3 each independently represent an aromatic hydrocarbon group that may have a substituent.

9. An organic electroluminescence device according to claim 8, wherein the arylamine compound represented by the formula (I) has a glass transition point of 90°

C. or higher.

10. An organic electroluminescence device according to claim 1, wherein the n-doped layer contains a metal oxide or an organic compound containing a fluorine atom or a cyano group as a substituent.