Patent ID: 8318395

Claim:
An electrophotographic image forming device comprising: a photosensitive member; and an exposure light source, wherein the exposure light source comprises an organic light emitting device to expose the photosensitive member, and wherein the organic light emitting device comprises an anode, a cathode and an organic light-emitting layer, wherein the organic light-emitting layer comprises a dibenzoanthracene compound that emits light and that is represented by the following structural formula (I): wherein both R 1 and R 2 represent a substituted or unsubstituted aryl group with the proviso that the substituted or unsubstituted aryl group does not contain a nitrogen atom, where the aryl group is any one of a phenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, and a perylenyl group; wherein R 3 to R 14 each represent a hydrogen atom or a substituent; and wherein the substituent represented by any one of R 3 to R 14 comprises any one of a straight or branched alkyl group in which a hydrogen atom may be substituted by a fluorine atom, a substituted or unsubstituted aryl group, where the aryl group is any one of a phenyl group, a naphthyl group, a fluorenyl group, a phenanthryl group, and a perylenyl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, and a halogen atom.