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The decay of the photoluminescence excited in rubrene single crystals by picosecond pulses is measured over 7 orders of magnitude and more than 4 time decades. We identify the typical decay dynamics due to triplet-triplet interaction. We show that singlet exciton fission and triplet fusion quantum yields in rubrene are both very large, and we directly determine a triplet exciton lifetime of 10020 s, which explains the delayed buildup of a large photocurrent that has been reported earlier for low excitation densities.
Ryasnyanskiy et al. (Mon,) studied this question.
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