| abstract |
PURPOSE:To obtain an org. film having its absorption region at the side of longer wavelengths, especially >=750nm and suitable for use as a photosensitive film for an electrophotographic printer provided with semiconductor laser as a light source, by using a specified pyrylium compound. CONSTITUTION:An org. film is formed using a pyrylium compound represented by formula I (where A<-> is formula II or formula III; each of X1 and X2 is S, O or Se; Z1 is a group of atoms required to complete pyrylium, thiopyrylium, selenapyrylium, naphthoselenapyrylium or the like; Z2 is a group of atoms required to complete pyrane, thiopyrane, selenapyrane, naphthoselenapyrane or the like; each of R1-R4 is H, alkyl, alkoxy, aryl, styryl, 4-phenyl-1,3-butadienyl or a heterocyclic group; and each of m and n is 1 or 2). The pyrylium compound includes a compound represented by formula IV. For example, the pyrylium compound is vacuum deposited on a substrate or coated together with a binder to form an org. film having about <=10mum thickness, and the film is used in an optical disk recorder. |