Reactions of triplet excited diphenyl, p-terphenyl, naphthalene and pyrene molecules were studied in benzene solvent by measuring the triplet-triplet absorption and the delayed fluorescence arising from triplet-triplet annihilation. It was found that the triplet-triplet reaction occurs practically with a diffusion limited rate. The first order decay rate parameters of triplet molecules in 5 mmol dm-3 benzene solutions were measured around 1x104s-1. In presence of Xe this rate parameter increased, which indicated a definite heavy atom effect on the triplet. The rate parameters were found in the order 105-106mol-1dm3s- 1.
|Number of pages||4|
|Journal||International Journal of Radiation Applications and Instrumentation. Part|
|Publication status||Published - 1990|