Abstract
The time dependence of delayed fluorescence (DF) and delayed excimer fluorescence (DEF) of poly (2-vinylnaphthalene) (P2VN) has been measured in fluid solution at ambient temperature. Within the time resolution of the apparatus, the DF decreases monotonically with time but DEF exhibits a maximum intensity near 300 ns. The time dependence of the DEF signal suggests that one of the triplet partners must be trapped prior to the annihilative event. Model calculations have been carried out yielding a trapping rate constant of (2.0±0.5)×10 9 M −1 s −1. The rate-controlling step for triplet trapping may involve internal rotation of the chain backbone.
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