Abstract
Abstract The carrier photogeneration mechanism has been investigated in N-vinylcarbazole(VCz)-1-vinylnaphthalene(VNa) copolymer. The photocurrent as well as the delayed fluorescence of carbazole chromophore due to the triplet–triplet (T–T) annihilation are found to be enhanced by introducing a few mole per cent of VNa units. The photocurrent shows a quadratic dependence upon the illumination light intensity in a high field. In the light of the emission study, the following carrier photogeneration involving T–T annihilation is found to occur in the VCz–VNa copolymer: (Remark: Graphics omitted.)Here, Cz and Na represent the carbazole and naphthalene chromophores, and the asterisk and double asterisk indicate the lowest and higher excited states, respectively.
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