Abstract
Fluorescence intensity correlation functions of single terrylene molecules in p-terphenyl crystals were measured within the temperature range 5–300 K. The analysis provided the population ( k 23) and depopulation ( k 31) intersystem crossing (ISC) rate constants of the lowest excited triplet state T 1. These rates increase continuously with temperature, without any noticeable change at the 193 K, temperature of the order–disorder phase transition in p-terphenyl crystal. The depopulation channel composed of the exciting light intensity dependent T 1 → T n absorption followed by the T n → S 1 ISC is important at higher temperatures.
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