| abstract |
(57) [Summary] [Objective] To provide a charge generating material having excellent charge generating efficiency. [Structure] A bisazo derivative represented by the following formula (I) is used as a charge generating material. [Chemical 1] (In the formula, R 1 and R 2 each independently represent an oxygen atom or a sulfur atom, R 3 and R 4 each independently represent a hydrogen atom, an alkyl group or an aryl group, and m and n are Each independently represents an integer of 0 to 2, Cp 1 and Cp 2 each independently represent a coupler residue. ) |