Delayed Luminescence of Organic Mixed Crystals. III. Decay Characteristics

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Abstract
Decays of delayed luminescence in the following mixed crystals were investigated over a wide temperature range above 77°K: phenanthrene in biphenyl, naphthalene‐h8 in biphenyl, naphthalene‐d8 in biphenyl, and chrysene in biphenyl. It is shown that the kinetic model proposed by Sternlicht et al. explains results satisfactorily. The relationship τP=2τDF was found in the vicinity of the characteristic temperature, which is determined essentially by the energy difference between host triplet and guest triplet states and by the first‐order phosphorescence decay rate. The activation energies for the annihilation process were obtained from the second‐order analysis of decays observed above the characteristic temperature; this analyzing procedure differs from that used by Hirota and Hutchison.