An electrophotographic organic photosensitive layer is formed by using a diphenoquinone derivative A and a diphenoquinone derivative B having a larger absolute value for reduction potential as electron transport materials. The diphenoquinone derivative A is, for example, 3,5-dimethyl-3',5'-di-t-butyl-4,4'-diphenoquinone. The diphenoquinone derivative B is, for example, 3,3',5,5'-tetra-t-butyl-4,4'-diphenoquinone. The diphenoquinone derivative B is included in the proportion of 3 to 50 wt% on the basis of the total weight of the electron transport materials (the diphenoquinone derivatives A and B).
使用还原电位绝对值较大的二吩醌衍
生物 A 和二吩醌衍
生物 B 作为电子传输材料,可形成电致发光有机感光层。二苯醌衍
生物 A 例如是 3,5-二甲基-3',5'-二叔丁基-4,4'-二苯醌。二苯醌衍
生物 B 例如是
3,3',5,5'-四-叔丁基-4,4'-二苯醌。在电子传输材料(二苯醌衍
生物 A 和 B)总重量的基础上,二苯醌衍
生物 B 的比例为 3-50 wt%。