An organic semiconductor having at least one compound of formula (PC-1); and a compound represented by formula (PC-1a): wherein M is a metallic atom, or two hydrogen atoms which bond respectively to a nitrogen atom of an isoindole ring and to a nitrogen atom of an isoindoline ring; R1 to R16 each independently are a hydrogen atom or a substituent, in which at least two substituents of R1 to R16 in formula (PC-1) are two or more different substituents, and in which at least one of the substituents of R1 to R16 in formula (PC-1a) is a fluorine atom, and at least one of the substituents of R1 to R16 in formula (PC-1a) is an electron-attracting group other than a fluorine atom.