Organic electroluminescent element, display device and lighting device

1. An organic electroluminescent element comprising organic layers sandwiched between an anode and a cathode, wherein the organic layers incorporates an emission layer A containing a host compound A and at least two types of emission dopants, and an emission layer B containing a host compound B and at least two types of emission dopants, provided that at least one of the emission dopants contained in the emission layer A is a phosphorescence-emitting material.

2. The organic electroluminescent element of claim 1 , wherein the emission layer B contains one type of emission dopant.

3. The organic electroluminescent element of claim 1 ,

wherein the emission layer A contains a blue light-emitting dopant.

4. The organic electroluminescent element of claim 1 ,

wherein the emission layer B is located in a position nearer to the anode than the emission layer A; and the emission layer A is located in a position nearer to the cathode than the emission layer B.

5. The organic electroluminescent element of claim 1 ,

wherein the emission layer A and the emission layer B each contain an identical emission dopant.

6. The organic electroluminescent element of claim 1 ,

wherein the organic layers contain at least three types of emission dopants: a blue light-emitting dopant; a green light-emitting dopant; and a red light-emitting dopant, provided that, of the three types of the emission dopants, at least two types are contained in the emission layer A and at least one type is contained in the emission layer B.

7. The organic electroluminescent element of claim 1 ,

wherein the emission layer B contains a red light-emitting dopant A, and the emission layer A contains a red light-emitting dopant B and a blue light-emitting dopant A.

8. The organic electroluminescent element of claim 1 ,

wherein the emission layer A contains a red light-emitting dopant and a blue light-emitting dopant; and the emission layer B contains a green light-emitting dopant.

9. The organic electroluminescent element of claim 1 ,

wherein the emission layer A and the emission layer B each contain an identical host compound.

10. The organic electroluminescent element of claim 1 ,

wherein a non-emitting intermediate layer is arranged between the emission layer A and the emission layer B.

11. The organic electroluminescent element of claim 10 , wherein the emission layer A, the emission layer B, and the non-emitting intermediate layer each contain an identical host compound.

12. The organic electroluminescent element of claims 10 ,

wherein the layer thickness of the non-emitting intermediate layer is in the range of 1 nm-15 nm.

13. The organic electroluminescent element of claim 1 ,

wherein a positive hole transport layer containing at least a positive hole transport material and an acceptor is incorporated as a constituent layer.

14. The organic electroluminescent element of claim 1 ,

wherein an electron transport layer containing at least an electron transport material and a donor is incorporated as a constituent layer.

15. The organic electroluminescent element of claim 1 ,

wherein the blue light-emitting dopant has an ionization potential (Ip) of 5.5 eV or less.

16. The organic electroluminescent element of claim 1 ,

wherein the blue light-emitting dopant is a compound having a partial structure represented by Formula (1):

wherein X 1 , X 2 , and X 3 each represent a carbon atom or a nitrogen atom; Z1 represents a group of atoms forming a 5-membered aromatic heterocycle; Z2 represents a group of atoms forming a 5-membered or 6-membered aromatic heterocycle or a 6-membered aromatic hydrocarbon ring; and M represents Ir or Pt.

17. The organic electroluminescent element of claim 1 ,

wherein the organic electroluminescent element emits a white light.

18. A display device comprising the organic electroluminescent element of claim 1 .

19. A lighting device comprising the organic electro luminescent element of claim 1 .