TECHNOLOGY FOCUS - IMAGING AND COMMUNICATION - Preparation (disclosed): Compound having tetraphenyl benzidine structure is reacted with phosphoric acid ester compound, after formylating by Vilsmeier reaction and introducing styryl group, to obtain triphenylamine derivative (I). Preferred Layer: The photosensitive layer further contains triphenylamine compound of formula (II).R9-R10=alkyl;R11-R17=R3;andn2,l,m=n1.The compound (II) is a position-isomer mixture obtained by mixing compounds (II) of a different structure. The photosensitive layer contains oxy titanium phthalocyanine of crystal form exhibiting diffraction peak at 24.1 degrees and 27.2 degrees at Bragg angle (2( theta ) plus minus 0.2 degrees ) in powder X-ray-diffraction spectrum according to X-ray characteristics using a CuK( alpha ) ray. SPECIFIC COMPOUNDS - 78 Triphenylamine derivatives (I) are disclosed e.g. N-(4-(4-((2,4-dimethylphenyl)((4-((E)-2-(4-methylphenyl)ethenyl)phenyl))amino)phenyl)phenyl)-2,4-dimethyl-N-(4-((E)-2-(4-methylphenyl)ethenyl)phenyl)aniline of formula (Ia), 1-N,4-N-bis(2,4-dimethylphenyl)-1-N,4-N-bis((4-((E)-2-phenylethenyl)phenyl))benzene-1,4-diamine, 1-N,4-N-bis(2,4-dimethylphenyl)-1-N,4-N-bis((4-((E)-2-(4-methylphenyl)ethenyl)phenyl))benzene-1,4-diamine, 1-N,4-N-bis(2,4-dimethylphenyl)-1-N,4-N-bis((4-((E)-2-(3-methoxyphenyl)ethenyl)phenyl))benzene-1,4-diamine and 1-N,4-N-bis(2,4-dimethylphenyl)-1-N-(4-((E)-2-(3-methoxyphenyl)ethenyl)phenyl)-4-N-(4-((E)-2-(4-methoxyphenyl)ethenyl)phenyl)benzene-1,4-diamine.    EXAMPLE - N-(4-(4-((2,4-dimethylphenyl)(phenyl)amino)phenyl)phenyl)-2,4-dimethyl-N-phenylaniline (in g) (5) was added in 50 ml of N,N-dimethylformamide and heated at 60 degrees C. Phosphorus oxychloride (4.3) was dropped at 70 degrees C or less after temperature rising, and reacted at 60-70 degrees C for 4 hours. The reaction product was hydrolyzed by discharge reaction liquid to liquid mixture of water and toluene. The organic layer was fractionated, washed until organic layer became neutral with sodium hydroxide aqueous solution and water, and concentrated. The product was purified and 4-((2,4-dimethylphenyl)(4-(4-((2,4-dimethylphenyl)(4-formylphenyl)amino)phenyl)phenyl)amino)benzaldehyde (B) (4.5) was obtained at yield of 81.8%. Benzaldehyde (B) and diethyl ((4-methylphenyl)methyl)phosphonate (4) were added in 100 ml of tetrahydrofuran and dissolved. t-Butoxy potassium (2.2) was added, stirred for 30 minutes and reacted at room temperature. The reaction liquid was discharged to water. The organic layer was concentrated after extraction with toluene, and N-(4-(4-((2,4-dimethylphenyl)((4-((E)-2-(4-methylphenyl)ethenyl)phenyl))amino)phenyl)phenyl)-2,4-dimethyl-N-(4-((E)-2-(4-methylphenyl)ethenyl)phenyl)aniline (4.3) was obtained at yield of 73.8%.