Quenching of Benzophenone Phosphorescence in the Vitreous Phase by Long‐Lived Guest Triplet States

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Abstract
Triplet (host)‐triplet (guest) annihilation has been observed and characterised in vitreous benzophenone. The quenching of the benzophenone phosphorescence by long‐lived guest triplet states was measured and the bimolecular annihilation rate constant γhg determined using naphthalene, pyrene, and coronene as guest materials. γhg is found to be independent of the nature of the guest, being of the order of 10−16 cm3s−1. This low value is related to the slow rates of exciton migration in the vitreous phase.