Absence of a host-crystal deuterium effect on the phosphorescence lifetime of naphthalene

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Abstract
Phosphorescence lifetimes have been measured for naphthalene and naphthalene‐d 8 in benzene, benzene‐d 6, benzophenone, and benzophenone‐d 10 host crystals at temperatures from 4 to 275°K. Within experimental error, there is no evidence for an intermolecular host‐crystal deuterium effect on the phosphorescence lifetime of naphthalene or naphthalene‐d 8. At the higher temperatures studied the naphthalene phosphorescence is weakened and the lifetime is shortened, yet there is no evidence for nonexponential decay or delayed fluorescence.