Abstract
Abstract The photo-oxidation effect on poly(N-vinylcarbazole) (PVCz) and amorphous 1,3-di(N-carbazolyl)propane films was studied by means of ultraviolet absorption, infrared absorption, and fluorescence spectra. The photoconductivity of the photo-oxidized PVCz films was also measured as a function of photoirradiation time. A photo-oxidation product which formed near the surface of films had a carbonyl substituent group, acted as a singlet exciton trap in competition with the excimer-forming sites, and formed an exciplex with an excited carbazolyl chromophore. The very slight amount of the photo-oxidation product enhanced the photoconductivity of PVCz films by a factor of ca.15, suggesting that the product acted as an electron-accepting impurity in the photo-carriergeneration mechanism in the lowest π-π* absorption region of PVCz films.
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