Abstract
The fluorescence properties and the intersystem crossing yield of the system anthracene-diethylaniline in nonpolar solvents have been investigated at different temperatures. Fluorescence transformation to the hetero-excimer 1(A −D +) and subsequent formation of an excited triple complex 1(A −D +D) accounts for the observed temperature dependence of intersystem crossing and fluorescence yields as well as the lifetime of the hetero-excimer. Fast intersystem crossing from a vibrationally non-relaxed hetero-excimer can be ruled out.
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