Organic electroluminescent element, display device and illuminating device

1. An organic electroluminescent element comprising a substrate having thereon an electrode and at least one organic layer,

wherein at least one of the organic layers is a light-emitting layer containing a phosphorescent compound and a host compound, and

the phosphorescent compound has a HOMO of from −5.15 to −3.50 eV and a LUMO of from −1.25 to +1.00 eV, and

the phosphorescent compound is represented by Formula (A),

wherein R 1 represents a substituent; Z represents a group of non-metal elements necessary to form a five- to seven-membered ring; n1 is an integer of 0 to 5; B 2 represents a carbon atom, B 1 and B 3 -B 5 each represent a carbon atom, a nitrogen atom, an oxygen atom or a sulfur atom and at least one of them represents a nitrogen atom; M 1 is a metal of 8-10 group in the periodic table; X 1 and X 2 each represent a carbon atom, a nitrogen atom, or an oxygen atom; L 1 is a group of elements forming ligands having coordination number 2 with X 1 and X 2 ; m1 is an integer of 1 to 3; m2 is an integer of 0 to 2; and m1+m2 is 2 or 3; and

the host compound has a glass transition temperature of 130° C. or more, the host compound has a 0-0 band of 460 nm or less in phosphorescence spectrum, and the host compound is represented by Formula (1),

wherein R 1a represents a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R 1 and R 2 each represent a hydrogen atom or a substituent; at least one of R 1 represents a dibenzofuryl group; n1 is an integer of 1-4; and n2 is an integer of 0-4.

2. The organic electroluminescent element of claim 1 , wherein the phosphorescent compound has the HOMO of from −4.80 to −3.50 eV and the LUMO of from −0.80 to +1.00 eV.

3. The organic electroluminescent element of claim 1 , wherein m2 is 0 in the phosphorescent compound represented by Formula (A).

4. The organic electroluminescent element of claim 1 , wherein a nitrogen containing heterocyclic ring formed by B 1 to B 5 is an imidazole ring in the phosphorescent compound represented by Formula (A).

5. The organic electroluminescent element of claim 1 , wherein the host compound is represented by Formula (2),

wherein R 1 and R 2 each represent a hydrogen atom or a substituent; at least one of R 1 represents a dibenzofuryl group; R 3 represents a substituent; n1 is an integer of 1-4; and n2 is an integer of 0-4; L 1 represents a divalent linking group; and m1 is an integer of 0-5.

6. The organic electroluminescent element of claim 1 , wherein the host compound is represented by Formula (3),

wherein R 1 , R 2 , and R 4 each represent a hydrogen atom or a substituent; at least one of R 1 represents a dibenzofuryl group; L 1 represents a divalent linking group; Ar 1 represents an aromatic group or a heterocyclic group; n1 is an integer of 1-4; n2 to n3 each is an integer of 0-4; and m 1 is an integer of 0 or 1.

7. The organic electroluminescent element of claim 6 , wherein Ar 1 in Formula (3) is a carbazolyl group.

8. The organic electroluminescent element of claim 1 , wherein a glass transition point of the host compound is 160° C. or more.

9. The organic electroluminescent element of claim 1 , further comprising an electron inhibition layer.

10. The organic electroluminescent element of claim 1 , emitting white light.

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

12. An illuminating device comprising the organic electroluminescent element of claim 1 .