Long-range radiationless energy transfer from the triplet states of aromatic hydrocarbons to the singlet states of fluorescent dyes (10—3 M) is used to measure the efficiencies of energy dissipation (φF, φIS, φP) for triphenylene, phenanthrene, p-terphenyl, chrysene, naphthalene, and/or their deuterated counterparts. Rhodamine B, rhodamine 6G, acriflavin, and fluorescein were found to be suitable acceptors. By measuring phosphorescence efficiencies directly, reliable estimates of T→S radiative rate constants can be obtained.

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The time dependence of the de-excitation of the phosphorescent state of phenanthrene-d10 by radiationless energy transfer to the fluorescent state of rhodamine B is observed. Good agreement is found with predictions based on the long-range dipole—dipole interaction described by Förster.