Photocarrier Generation Mechanism of Layered Organic Photoreceptor Using Two-Coupler-Based Bisazo Pigment

概要

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We have investigated the photocarrier generation mechanism of a layered organic photoreceptor containing two-coupler-based fluorenone bisazo pigment in comparison with the conventional bisazo pigment which has the same coupler components. The magnitude of quantum efficiency of both layered photoreceptors in a higher electric field approaches that of the charge separation efficiency of a photogenerated exciton to form a geminate hole-electron pair. The charge separation efficiency of the layered photoreceptor containing the asymmetrically structured bisazo pigment is about 1.5 times larger than that containing the symmetrically structured pigment. The charge separation is considered to be attributed to the photoinduced electron transfer; the disparity of the reaction rate could not be explained based on the energy gap. The size of the primary particles of asymmetrical azo is found to be about half the size of those of the symmetrical azo. It is therefore concluded that the high photosensitivity is due to the size of the azo pigment particles which practically induce a change in the number of charge separation sites.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2000-12-15