Add time:09/29/2019         Source:infona.pl

Thermal evolution of fluorescence intensity correlation functions of single molecules of TERRYLENE (cas 188-72-7) in a p-terphenyl crystal was studied and double-exponential decay at 5K was found to change to a mono-exponential decay above 17.5K. Such behavior was attributed to spin–lattice relaxation (SLR), which couples the long-lived zero-field triplet spin sublevel T Z with the short-lived and experimentally unresolved T X and T Y sublevels. For two of the studied molecules, which were probably deformed from planar symmetry, we observed overpopulation of the spin sublevel T Z and activation of the SLR at temperatures above 20K. The SLR rate constant exhibited Raman relaxation.

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