Organic electroluminescent element

• US 20070090756A1
• Filed: 10/10/2006
• Published: 04/26/2007
• Est. Priority Date: 10/11/2005
• Status: Abandoned Application

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Nishita, Nobuhiro, Okada, Hisashi
• Application Number:
  US11/544,669
• Publication Number:
  US 20070090756A1
• Time in Patent Office: Days
• US Class Current: 313/506
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2101/90 Multiple hosts in the emissive layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/165 comprising dopants

Abstract

The invention provides an organic electroluminescent element comprising an organic layer containing at least one luminescent layer and at least one charge transporting layer being interposed between a pair of electrodes, wherein the organic electroluminescent element comprises: (1) two or more kinds of host materials and at least one luminescent material contained in the luminescent layer; (2) at least one layer adjacent to the luminescent layer, the layer containing a host material and substantially no luminescent material; and (3) at least one charge transporting layer being doped with at least one of an electron-accepting compound and an electron-donating compound.

Claims

1. An organic electroluminescent element including, interposed between a pair of electrodes, an organic layer including at least one luminescent layer and at least one charge transporting layer, wherein the organic electroluminescent element comprises:

(1) two or more kinds of host materials and at least one luminescent material included in the luminescent layer;

(2) at least one layer that is adjacent to the luminescent layer and includes a host material and substantially no luminescent material; and

(3) at least one charge transporting layer being doped with at least one of an electron-accepting compound or an electron-donating compound.

2. The organic electroluminescent element of claim 1, wherein at least one of the charge transporting layers is a hole transport layer disposed between the luminescent layer and an anode, and the hole transport layer is doped with a p-dopant of an electron-accepting compound.

3. The organic electroluminescent element of claim 1, wherein at least one of the charge transporting layers is an electron transport layer disposed between the luminescent layer and a cathode, and the electron transport layer is doped with an n-dopant of an electron-donating compound.

4. The organic electroluminescent element of claim 1, wherein the layer including the host material and substantially no luminescent material is a hole transporting intermediate layer including a hole transporting host material and disposed on a surface of the luminescent layer that faces an anode.

5. The organic electroluminescent element of claim 1, wherein the layer including the host material and substantially no luminescent material is an electron transporting intermediate layer including an electron transporting host material and disposed on a surface of the luminescent layer that faces a cathode.

6. The organic electroluminescent element of claim 1, wherein the luminescent material is a phosphorescent material.

7. The organic electroluminescent element of claim 2, wherein the layer including the host material and substantially no luminescent material is a hole transporting intermediate layer containing a hole transporting host material and disposed on a surface of the luminescent layer facing an anode.

8. The organic electroluminescent element of claim 2, wherein the layer including the host material and substantially no luminescent material is an electron transporting intermediate layer including an electron transporting host material and disposed on a surface of the luminescent layer facing a cathode.

9. The organic electroluminescent element of claim 2, wherein the luminescent material is a phosphorescent material.

10. The organic electroluminescent element of claim 3, wherein the at least one of the charge transporting layers is a hole transport layer disposed between the luminescent layer and an anode, and the hole transport layer is doped with a p-dopant of an electron-accepting compound.

11. The organic electroluminescent element of claim 3, wherein the layer including the host material and substantially no luminescent material is a hole transporting intermediate layer containing a hole transporting host material and disposed on a surface of the luminescent layer facing an anode.

12. The organic electroluminescent element of claim 3, wherein the layer including the host material and substantially no luminescent material is an electron transporting intermediate layer containing an electron transporting host material and disposed on a surface of the luminescent layer facing an cathode.

13. The organic electroluminescent element of claim 3, wherein the luminescent material is a phosphorescent material.

14. The organic electroluminescent element of claim 4, wherein the layer including the host material and substantially no luminescent material is an electron transporting intermediate layer containing an electron transporting host material and disposed on a surface of the luminescent layer facing a cathode.

15. The organic electroluminescent element of claim 4, wherein the luminescent material is a phosphorescent material.

16. The organic electroluminescent element of claim 5, wherein the luminescent material is a phosphorescent material.

17. The organic electroluminescent element of claim 7, wherein the layer including the host material and substantially no luminescent material is a hole transporting intermediate layer containing a hole transporting host material and disposed on a surface of the luminescent layer facing an anode.

18. The organic electroluminescent element of claim 10, wherein the layer including the host material and substantially no luminescent material is a hole transporting intermediate layer containing a hole transporting host material and disposed on a surface of the luminescent layer facing an anode.

19. The organic electroluminescent element of claim 10, wherein the layer including the host material and substantially no luminescent material is an electron transporting intermediate layer containing an electron transporting host material and disposed on a surface of the luminescent layer facing a cathode.

20. The organic electroluminescent element according to claim 10, wherein the luminescent material is a phosphorescent material.