Biscarbazole derivatives and organic electroluminescence

1. A biscarbazole derivative, which is represented by the following formula (1):

in the formula (1):

A 1 and A 2 each independently represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 2 to 30 ring carbon atoms;

Y 1 to Y 16 each independently represent C(R) or a nitrogen atom, and each R independently represents a hydrogen atom, a substituent, or a bond to a carbazole skeleton; and

L 1 and L 2 each independently represent a single bond, a substituted or unsubstituted, divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted, divalent aromatic heterocyclic group having 2 to 30 ring carbon atoms,

provided that:

at least one of A 1 and A 2 represents a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted benzonaphthofuranyl group, or a substituted or unsubstituted benzonaphthothiophenyl group;

when one of A 1 and A 2 represents a dibenzofuranyl group or a dibenzothiophenyl group, the other represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted benzonaphthofuranyl group, or a substituted or unsubstituted benzonaphthothiophenyl group; and

when Y 6 and Y 11 are bonded to each other, the following conditions (i) and (ii) are satisfied:

(i) when A 1 represents a dibenzofuranyl group or a dibenzothiophenyl group, L 1 represents an optionally substituted divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms; and

(ii) when A 2 represents a dibenzofuranyl group or a dibenzothiophenyl group, L 2 represents an optionally substituted divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms.

2. The biscarbazole derivative according to claim 1 , wherein the derivative is represented by the following formula (2):

in the formula (2), A 1 , A 2 , Y 1 to Y 16 , L 1 , and L 2 each have the same meaning as that in the formula (1).

3. The biscarbazole derivative according to claim 1 , wherein the derivative is represented by the following formula (3) or (4):

in the formula (3) or the formula (4), A 1 , A 2 , Y 1 to Y 16 , L 1 , and L 2 each have the same meaning as that in the formula (1).

4. The biscarbazole derivative according to claim 1 , wherein the -L 1 -A 1 and the -L 2 -A 2 are different from each other.

5. The biscarbazole derivative according to claim 1 , wherein the A 1 represents a substituted or unsubstituted benzofuranyl group, a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted benzothiophenyl group, a substituted or unsubstituted dibenzothiophenyl group, a substituted or unsubstituted benzonaphthofuranyl group, or a substituted or unsubstituted benzonaphthothiophenyl group.

6. The biscarbazole derivative according to claim 1 , wherein the L 1 represents a substituted or unsubstituted, divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted, divalent aromatic heterocyclic group having 2 to 30 ring carbon atoms, and the A 1 represents a 1-dibenzofuranyl group, a 3-dibenzofuranyl group, a 4-dibenzofuranyl group, or a dibenzothiophenyl group.

7. The biscarbazole derivative according to claim 1 , wherein at least one of the L 1 and the L 2 represents a divalent aromatic heterocyclic group represented by the following general formula (a):

in the formula (a):

Y 21 to Y 25 each independently represent C(R a ) or a nitrogen atom, and R a 's each independently represent a hydrogen atom, a substituent, or a bond to L 3 ; and

L 3 and L 4 each independently represent a single bond, a substituted or unsubstituted, divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted, divalent aromatic heterocyclic group having 2 to 30 ring carbon atoms,

provided that one or more of Y 21 to Y 25 each represent a nitrogen atom.

8. A material for an organic electroluminescence device, comprising the biscarbazole derivative according to claim 1 .

9. An organic electroluminescence device, comprising a plurality of organic thin-film layers including a light emitting layer between a cathode and an anode, wherein at least one of the plurality of organic thin-film layers comprises the biscarbazole derivative according to claim 1 .

10. The organic electroluminescence device according to claim 9 , wherein the light emitting layer comprises the biscarbazole derivative as a host material.

11. The organic electroluminescence device according to claim 10 , wherein the light emitting layer comprises a phosphorescent material.

12. The organic electroluminescence device according to claim 11 , wherein the phosphorescent material comprises an ortho-metalated complex of a metal atom selected from iridium (Ir), Osmium (Os), and platinum (Pt).

13. The organic electroluminescence device according to claim 12 , wherein an electron injecting layer is positioned between the cathode and the light emitting layer, and the electron injecting layer comprises a nitrogen-containing ring derivative.

14. The organic electroluminescence device according to claim 13 , wherein an electron transporting layer is positioned between the cathode and the light emitting layer, and the electron transporting layer comprises the biscarbazole derivative.

15. The organic electroluminescence device according to claim 14 , wherein a hole transporting layer is positioned between the anode and the light emitting layer, and the hole transporting layer comprises the biscarbazole derivative.

16. The organic electroluminescence device according to claim 15 , further comprising a electron-donating dopant at an interface between the cathode and the plurality of organic thin-film layers.

17. The organic electroluminescence device according to claim 9 , wherein the device emits a fluorescent emission.

18. The organic electroluminescence device according to claim 17 , wherein a hole injecting layer is positioned between the anode and a hole transporting layer.

19. The organic electroluminescence device according to claim 18 , wherein at least one of the hole transporting layer and the hole injecting layer comprises an acceptor material.

20. The organic electroluminescence device according to claim 17 , wherein the light emitting layer comprises at least one of an anthracene derivative, a fluoranthene derivative, a styrylamine derivative, and an arylamine derivative.

21. A lighting apparatus, comprising the organic electroluminescence device according to claim 9 .

22. A display apparatus, comprising the organic electroluminescence device according to claim 9 .

23. The organic electroluminescence device according to claim 9 , wherein a hole transporting layer is positioned between the anode and the light emitting layer, and the hole transporting layer comprises the biscarbazole derivative.

24. The organic electroluminescence device according to claim 9 , wherein an electron transporting layer is positioned between the cathode and the light emitting layer, and the electron transporting layer comprises the biscarbazole derivative.

25. The biscarbazole derivative according to claim 1 , wherein in the formula (1), when Y 6 and Y 11 are bonded to each other, the following conditions (i-1) and (ii-1) are satisfied:

(i-1) when A 1 represents a dibenzofuranyl group or a dibenzothiophenyl group, L 1 represents an optionally substituted phenylene group; and

(ii-1) when A 2 represents a dibenzofuranyl group or a dibenzothiophenyl group, L 2 represents an optionally substituted phenylene group.

26. The biscarbazole derivative according to claim 1 , wherein in the formula (1), when Y 6 and Y 11 are bonded to each other, the following conditions (i-2) and (ii-2) are satisfied:

(i-2) when A 1 represents a dibenzofuranyl group or a dibenzothiophenyl group, L 1 represents an unsubstituted divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms; and

(ii-2) when A 2 represents a dibenzofuranyl group or a dibenzothiophenyl group, L 2 represents an unsubstituted divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms.

27. The biscarbazole derivative according to claim 1 , wherein A 1 represents a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group.

28. The biscarbazole derivative according to claim 1 , wherein A 1 represents a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group; and L 1 represents an optionally substituted divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms.

29. The biscarbazole derivative according to claim 1 , wherein A 1 represents a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group; and L 1 represents an unsubstituted divalent aromatic hydrocarbon group having 6 to 30 ring carbon atoms.

30. The biscarbazole derivative according to claim 1 , wherein A 2 represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms; and L 2 represents a single bond.

31. The biscarbazole derivative according to claim 1 , wherein Y 1 to Y 16 represent C(R).

32. The biscarbazole derivative according to claim 31 , wherein R is a hydrogen atom.

33. The biscarbazole derivative according to claim 1 , wherein at least one of A 1 and A 2 represents a substituted or unsubstituted 2-dibenzofuranyl group, a substituted or unsubstituted 4-dibenzofuranyl group, a substituted or unsubstituted 2-dibenzothiophenyl group, or a substituted or unsubstituted 4-dibenzothiophenyl group.