Determination of triplet formation efficiencies by the measurement of sensitized delayed fluorescence

Abstract

Measurement of the relative intensities and lifetimes of the P-type delayed fluorescence of the same acceptor compound sensitized by two donor compounds allows the ratio of the triplet formation efficiencies of the two donor compounds to be calculated. The method has been applied to a selection of aromatic hydrocarbons using perylene as acceptor and anthracene as the standard donor. With five of the six compounds studied, the sum of the triplet formation efficiency and the fluorescence efficiency exceeds 0.9. The results are compared with previous data and the application of triplet formation efficiencies to the calculation of other photochemical parameters is briefly discussed.