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1. A biscarbazole derivative represented by a formula (1) below,where: A1 and A2 represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 1 to 30 ring carbon atoms, with the proviso that at least one of A1 and A2 represents a substituted or unsubstituted aromatic heterocyclic group having 1 to 30 ring carbon atoms;
Y1 to Y4 each are a nitrogen atom or a carbon atom to be bonded to the following R, with the proviso that, when adjacent two of Y1 to Y4 are carbon atoms, a ring including the adjacent carbon atoms is optionally formed without the adjacent carbon atoms being bonded to R; Y5 to Y7 are a nitrogen atom or a carbon atom to be bonded to the following R, with the proviso that, when adjacent two of Y5 to Y7 are carbon atoms, a ring including the adjacent carbon atoms is optionally formed without the adjacent carbon atoms being bonded to R; one of Y8 to Y11 is a carbon atom bonded to L3, and except for the one of Y8 to Y11 that is bonded to L3, Y8 to Y11 are a nitrogen atom or a carbon atom to be bonded to the following R, with the proviso that, when adjacent two of Y8 to Y11 are carbon atoms, a ring including the adjacent carbon atoms is optionally formed without the adjacent carbon atoms being bonded to R; Y12 to Y15 are a nitrogen atom or a carbon atom to be bonded to the following R, with the proviso that, when adjacent two of Y12 to Y15 are carbon atoms, a ring including the adjacent carbon atoms is optionally formed without the adjacent carbon atoms being bonded to R; R each independently represents a hydrogen atom, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 1 to 30 ring carbon atoms, a substituted or unsubstituted linear, branched or cyclic alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted haloalkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted haloalkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted trialkylsilyl group having 3 to 30 carbon atoms, a substituted or unsubstituted dialkylarylsilyl group having 8 to 40 carbon atoms, a substituted or unsubstituted alkyldiarylsilyl group having 13 to 50 carbon atoms, a substituted or unsubstituted triarylsilyl group having 18 to 60 carbon atoms, a halogen atom, a cyano group, a hydroxyl group, a nitro group, or a carboxy group; and L1 to L3 represent a single bond or a divalent linking group, with the proviso that, when L3 is a single bond and is bonded to Y11, L1 and L2 are divalent linking groups. |
