Organic electroluminescence device

• US 8,017,254 B2
• Filed: 03/02/2007
• Issued: 09/13/2011
• Est. Priority Date: 03/06/2006
• Status: Active Grant

• Current Assignee: UDC Ireland Limited (Universal Display Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Itai, Yuichiro
• Primary Examiner(s): Shosho; Callie E
• Assistant Examiner(s): Wilson; Michael H
• Application Number:
  US11/713,027
• Publication Number:
  US 20070205411A1
• Time in Patent Office: 1,656 Days
• Field of Search: 257/90, 257/E51.019
• US Class Current: 428/690
• 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 consisting of an alkali metal and a layer containing a hole transport material between the p-doped layer and the n-doped layer;

wherein the layer containing a hole transport material is not doped with a p-dopant, the p-doped layer is located next to the layer containing a hole transport material, and the layer containing a hole transport material directly contacts the alkali metal layer.

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

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

4. An organic electroluminescence device according to claim 3, wherein the alkali metal layer is 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 is 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):

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 p-doped layer contains V₂O₅, Re₂O₇, F4-TCNQ, or MoO₃.

11. 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 consisting of an alkali metal and a layer consisting of a hole transport material between the p-doped layer and the n-doped layer;

wherein the p-doped layer is located next to the layer consisting of a hole transport material, and the layer consisting of a hole transport material directly contacts the alkali metal layer.