Organic electroluminescent element, display device and lighting device
View Patent ↗Disclosed is an organic electroluminescent device having long life, while exhibiting high luminous efficiency. Also disclosed are an illuminating device and a display, each using such an organic electroluminescent device. In the organic electroluminescent device, a compound represented by the general formula (A) which is suitable as a host material for a phosphorescent metal complex is used at least in one sublayer of a light-emitting layer.
1. An organic electroluminescent element comprising a substrate having thereon at least an anode and a cathode, and a light emitting layer between the aforesaid anode and the aforesaid cathode, wherein at least one light emitting layer incorporates a compound represented by Formula (A):
wherein A1 and A2 each represents a hydrogen atom or a substituent, provided that at least one of A1 and A2 represents a nitrogen atom containing substituent; X and Y each represents O, S, Se, Te, or N—R (where R represents a hydrogen atom or a substituent), providing that X is different from Y; L1, L2, and L3 each represents a divalent linking group; provided that L3 is bonded at a 2 or 3 position of a phenyl ring, n represents an integer of 1 or 2; n1 and n2 each represents an integer of 1 or 2; and n3 and n4 each represents 0 or 1.
2. The organic electroluminescent element of claim 1 , wherein the aforesaid L3 represents an arylene group, a heteroarylene group, a divalent heterocyclic group or an alkylene group.
3. The organic electroluminescent element of claim 1 , wherein the aforesaid L3 represents an arylene group.
4. The organic electroluminescent element of claim 1 , wherein the aforesaid L3 represents a m-phenylene group.
5. The organic electroluminescent element of claim 1 , wherein the aforesaid nitrogen atom-containing substituent is a carbazolyl group.
6. The organic electroluminescent element of claim 1 , wherein the aforesaid nitrogen atom-containing substituent represents a carbolynyl group and the aforesaid carbolynyl group is the substituent which is derived from the carboline derivative represented by Formula (a):
wherein X 1 -X 8 each represents a nitrogen atom or —C(Ra)═; at least one of the aforesaid X 1 -X 8 represents a nitrogen atom; and Ra and Rb each represents a hydrogen atom or a substituent.
7. The organic electroluminescent element of claim 1 , wherein the aforesaid nitrogen atom-containing substituent is a diarylamino group.
8. The organic electroluminescent element of claim 1 , wherein the aforesaid X is an oxygen atom.
9. The organic electroluminescent element of claim 1 , emitting white light.
10. A display device provided with the organic electroluminescent element of claim 1 .
11. An illuminating device provided with the organic electroluminescent element of claim 1 .
12. The organic electroluminescent element of claim 1 , wherein the aforesaid light emitting layer incorporates a phosphorescence emitting metal complex.
13. The organic electroluminescent element of claim 12 , wherein the aforesaid phosphorescence emitting metal complex is an Ir complex.
14. The organic electroluminescent element of claim 12 , wherein the aforesaid phosphorescence emitting metal complex is represented by Formula (B):
wherein R 1 represents a substituent; Z represents a group of non-metal atoms necessary for forming a 5-7 membered ring; n 1 represents an integer of 0-5; B 1 -B 5 each represents a carbon atom, a nitrogen atom, an oxygen atom, or a sulfur atom and at least one represents a nitrogen atom; M 1 represents a metal of Groups 8-10 in the element periodic table; X 1 and X 2 each represents a carbon atom, a nitrogen atom, or an oxygen atom; L 1 represents a group of atoms which form a bidentate ligand with X 1 and X 2 ; m1 represents 1, 2, or 3; and m2 represents 0, 1, or 2, provided that a sum of m1 and m2 is 2 or 3.
15. The organic electroluminescent element of claim 14 , wherein m2 of the phosphorescence emitting metal complex represented by the aforesaid Formula (B) is 0.
16. The organic electroluminescent element of claim 14 , wherein a nitrogen-containing heterocyclic ring formed by phosphorescence emitting metal complexes B1-B5 in the aforesaid Formula (B) is an imidazole ring.