Abstract: To provide a photoelectric conversion element capable of further improving performance in a photoelectric conversion element using an organic semiconductor material. The photoelectric conversion element includes a first electrode and a second electrode arranged to face each other, and a photoelectric conversion layer 17 provided between the first electrode and the second electrode, in which the photoelectric conversion layer 17 includes a first organic semiconductor material and a second organic semiconductor material, and at least one of the first organic semiconductor material or the second organic semiconductor material is an organic molecule having a HOMO volume fraction of 0.15 or less or a LUMO volume fraction of 0.15 or less.

Abstract: An electrophotographic toner containing a compound of the following formula (I): ##STR1## wherein each of X and Y which are independent of each other, is a hydrogen atom, ##STR2## (wherein each of D.sub.1 and D.sub.2 is a hydrogen atom or an electron donating group, provided that D.sub.1 and D.sub.2 are not simultaneously hydrogen atoms, R.sub.1 is a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, an acyl group, a nitro group, a cyano group or R.sub.2 SO.sub.2 -- (wherein R.sub.2 is a hydroxyl group, an amino group, an alkyl-substituted amino group, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group or an alkoxy group), and n is 0, 1 or 2, provided that when n is 2, the plurality of R.sub.1 may be the same or different), ##STR3## (wherein D.sub.3 is an electron donating group, and R.sub.1 and n are as defined above), ##STR4## (wherein D.sub.3, R.sub.1 and n are as defined above), ##STR5## (wherein D.sub.3, R.sub.

Abstract: An electrophotographic toner containing a compound of the following formula (I): ##STR1## wherein each of X and Y which are independent of each other, is a hydrogen atom, ##STR2## (wherein each of A.sub.1 and A.sub.2 is a hydrogen atom or an electron attracting group, provided that A.sub.1 and A.sub.2 are not simultaneously hydrogen atoms, R.sub.1 is a hydrogen atom, a halogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, an alkoxy group, a dialkylamino group, a diarylamino group, a diaralkylamino group or a hydroxyl group, and n is 0, 1 or 2, provided that when n is 2, the plurality of R.sub.1 may be the same or different), ##STR3## (wherein A.sub.3 is an electron attracting group, and R.sub.1 and n are as defined above), ##STR4## (wherein A.sub.3, R.sub.1 and n are as defined above), ##STR5## (wherein A.sub.3, R.sub.1 and n are as defined above) or ##STR6## (wherein A.sub.3 is as defined above, and each of R.sub.2 and R.sub.