Abstract
The absorption spectra and luminescence of solutions and crystals of diphenyl are studied. According to the dependence of quantum yields of fluorescence on impurity concentration, the probabilities of capture of exitons by molecules of different impurities as well as the diffusion-displacement length of singlet exitons in diphenyl crystals are determined. It is established that the probabilities of capture of exitons by the impurity depend on the overlap integral of the impurity's absorption spectra with the fluorescence spectrum of the crystalline matrix, as well as on the dimensions and configuration of the impurity molecules.
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