Patent ID: 8110685

Claim:
An azafluorene derivative represented by the following general formula (III): wherein m represents an integer of 2 to 4, a represents an integer of 0 to 4, and b represents an integer of 0 to 2; wherein X 1 and X 2 each independently represent a substituent selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted heterocyclic group, and a substituted amino group; wherein Ar represents an m-valent aromatic hydrocarbon group which may be substituted; and wherein R 1 and R 2 each independently represent an alkyl group which is unsubstituted or may be substituted by a fluorine atom.