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The potential in analytical chemistry of sensitized phosphorescence In liquid solutions at room temperature (RTPL) Is examined. After excitation (before radiationless decay Is effective) the analyte molecule transfers Its triplet-state energy to an acceptor molecule which subsequently emits phosphorescence. 1,4-Dlbromonaphthalene and blacetyl are Investigated as acceptors In solvents frequently used In liquid chromatography. Three points are considered: (I) the excitation wavelength ranges for the analytes, limited by the acceptors, (II) the minimum triplet-state energies of the analyte, necessary to make the energy transfer process diffusion controlled, and (III) the phosphorescence efficiencies of the acceptors at room temperature In various solvents. More favorable excitation properties make blacetyl more widely applicable than 1,4-dibromonaphthalene. Limits of detection obtained for a number of substituted benzophenones and biphenyls In acetonltrlle/water (1:1) are on the order of 10~8 M.

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