A method which utilizes photon counting is developed for measuring low-level luminescence lifetimes. The technique requires two counters and a pulse sequence generator. The method is applied to the measurement of the delayed fluorescence lifetimes in anthracene and tetracene single crystals. The lifetime of triplet excitons in vapor-grown tetracene crystals is found to be 43 μsec.
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Arnold et al. (1976) studied this question.
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