Effect of Deuteration of Durene on the Lifetime of the Phosphorescent Triplet State of Naphthalene in a Durene Host Crystal

摘要

The observation of a pronounced increase in the lifetime of the lowest triplet state of naphthalene in a single crystal of durene produced by deuteration of the durene is reported. For naphthalenehyphen;d8at sim;298deg;K the increase in mean life is from 0.8 to 10.8 sec. It is shown that the decay in question is an exponential tripletmdash;singlet intramolecular transition.