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A sensitization effect has been observed in the photochromism of vacuum-deposited polydiacetylene (PDA-12, 8) films with a lead phthalocyanine underlayer. The threshold photon energy of photochromism has been found to be extended from about 2.0 eV in the PDA film to the near infrared region by the sensitization. Transient changes in optical absorption in the sensitized PDA film by a pulsed-light excitation indicate that the response time of photochromism is shorter than 10 ns.
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Fukagai et al. (1990) studied this question.
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