| 摘要 |
An organic photoreceptor is described. The photosensitive layer contains a pyranthrone compound represented by Formula 1 which has been subjected to purification processing so as to have a mass reduction ratio D<SUB>400/450 </SUB>between 400° C. and 450° C. of not more than 2.0% in a thermogravimetric analysis; <?in-line-formulae description="In-line Formulae" end="lead"?>D<SUB>400/450</SUB>={(G<SUB>400</SUB>-G<SUB>450</SUB>)/G<SUB>i</SUB>}x100<?in-line-formulae description="In-line Formulae" end="tail"?> wherein G<SUB>i </SUB>is a mass at 25° C., and G<SUB>400 </SUB>and G<SUB>450 </SUB>are each mass at 400° C. and 450° C., respectively, wherein R<SUB>1 </SUB>through R<SUB>14 </SUB>are each a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a halogen atom, a cyano group or a nitro group. The image forming method using the photoreceptor, and the pyranthrone compound are also disclosed.
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