PHOTOPHYSICAL PROCESSES OF SOME CARBAZOLE DERIVATIVES

The photophysical properties of phenylcarbazole (PHCz), alpha-naphthyl carbazole (alpha-NACz), beta-naphthylcarbazole (beta-NACz) and N-(3-py ridyl)-carbazole (PyCz) were studied. alpha-NACz and beta-NACz exhibit twisted intramolecular charge transfer fluorescence in polar solvents . The fluorescence of the carbazole derivatives can be quenched by ele ctron donors and accepters, and the quenching effects follow the Stem- Volmer equation. The existence of exciplexes is observed between the c arbazole derivatives and electron accepters, such as p-dicyanobenzene, dimethylterephthalate and benzanilide.