Luminescence of 5-Phenyltetrazole and its Derivatives. Part II. Phosphorescence

I. Gryczyński, A. Kawski, Z. Grzonka, A. Rażyńska

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Abstract

The phosphorescence spectra, mean lifetimes of phosphorescence and ratios of phosphorescence/fluorescence quantum yields have been measured for 5-phenyitetrazole and its three methyl derivatives in a polyvinyl alcohol film over the temperature range of (77−250) K. Temperature responses of the non-radiative intersystem crossing constant. KST, and the non-radiative triplet state deactivation constant. km, have been investigated on the basis of these measurements. The energy of activation for the non-radiative transitions has been determined. With the methyl 5-phenyltetrazoles. the thermal deactivation of the triplet state, contrary to the intersystem crossing, has been found to be influenced by the position of the methyl substituent in the phenyl ring.

Original languageEnglish
Pages (from-to)556-559
Number of pages4
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume39
Issue number6
DOIs
StatePublished - 1 Jun 1984

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