Multi-exponential analysis of the fluorescence decays of 9-cyano-10-t-butylanthracene in PMMA

Add time:09/07/2019    Source:sciencedirect.com

With the time-correlated single-photon counting technique, the dynamic behaviour of the excited singlet state of the title compound has been investigated under various conditions. In poly(methyl methacryiate) (PMMA) it exhibits temperature-dependent multi-exponential decays, mostly two exponentials below 153 K but three at higher temperatures. The relative fluorescence yields obtained in PMMA from the static measurements disagree with fluorescence quantum yields calculated from the lifetimes of each component. This discrepancy implies a very fast radiationless process from S1 to S0 (>1010 s−1). Its existence could not be deduced without detailed multi-exponential analysis.

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