Photoexcited states of fluorenone bisazo and triphenylamine trisazo pigments, both generating photocarriers extrinsically with the hole-transport-type arylamine molecules through the photoinduced electron transfer with high efficiency, were investigated by means of electromodulated absorption spectra. As a result, it was found that the former pigment forms a Frenkel exciton and the latter pigment a charge-transfer (CT) exciton. The different types of excitons well explained the photosensitivity of photoreceptors based on these two azo pigments.
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Umeda et al. (1995) studied this question.
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