Abstract
Fast heat pulses are utilized to examine the dynamics of electronic relaxation processes in neat and chemically mixed crystals. The kinetics of triplet exciton and trap phosphorescence and singlet delayed fluorescence are discussed and the results of several experiments presented. Fast heat pulses are employed to determine the electronic relaxation time of long lived spin-states of chemical traps in mixed crystals. It is suggested that the technique of heat pulse modulation of delayed fluorescence, exciton phosphorescence, and trap phosphorescence may be generally useful for the exploration of electronic relaxation dynamics in molecular crystals.
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