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The relative quantum yields of the fluorescence of the host (ν̄ 0  = 31474 cm -1 ), a shallow trap (X 1 , ν̄ 0 = 31444 cm -1 ), and a guest (β-methyl-naphthalene, ν̄ 0 =31059 cm -1 ) have been measured from 2 to 100°K in naphthalene crystals as host. The temperature dependence can be described quantitatively by a hopping model for the exciton diffusion. The hopping time of the exciton ( t H ≌ 10 -13  sec) is independent of the temperature. The freezing in of the β-methyl-naphthalene fluorescence at low temperatures is the result of the competition between the two traps (β-MN and X 1 ). In addition, the fluorescence spectrum of β-methyl-naphthalene as a guest in naphthalene has been measured and analyzed.

Die Temperaturabhängigkeit der sensibilisierten Fluoreszenz in Naphthalin-Kristallen zwischen 2 und 100° K