Abstract
The low temperature phosphorescence spectra, polarization and the lifetime of the phosphorescence for five derivatives of 2-(biphenyl-4′-yl)-5-phenyl-1,3,4-oxadiazole (PBD) were measured. Two chemical pathways were found to force molecules of the PBD-type to phosphoresce: introducing a substituent with a localized low-energy nπ* state or substitution by a heavy atom (bromine). In both cases, the emitting, i.e. the lowest excited triplet state, is of the ππ* character. The T 1 characteristics of the non-phosphorescent PBD were estimated by analogy. The vibrational structure of the phosphorescence spectral bands yields the information on the planarity of PBD-type chromophore in the excited T 1 state.
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