Die Konzentrationsabhängigkeit der Energie-Übertragung in Anthracen-Tetracen-Mischkristallen
Open Access
- 1 February 1964
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 19 (2) , 177-181
- https://doi.org/10.1515/zna-1964-0203
Abstract
The relative quantum yields of the host and guest fluorescence in anthracene-tetracene mixed crystals have been measured for tetracene concentrations cT between 10-6 and 10-1 mol/mol and temperatures below and above the temperature region, where the energy transfer is partially quenched by shallow traps (35°K) . The concentration dependence of the quantum ratio is measured as QT/QA = k • cT p, where the exponent p is nearly 1 and k is measured as 6 · 104 and explained as the ratio τW/tH (τW is the decay time of the host fluorescence and tH the hopping time) . The fraction of transfer which is quenched at lowest temperatures is independent of the tetracene concentration. The results are compared with the exciton diffusion mechanism for energy transfer (hopping model) .Keywords
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