The results of luminescence studies of thulium trisbenzoylacetonate and thulium trisdibenzoylmethide are reported. Selective excitation of the1G4level of Tm3+via energy transfer has been achieved. Emission from the3F4level of the ion has been observed, and all the groups of lines appearing in the visible and near infrared spectral regions have been assigned. A quenching mechanism involving vibrational coupling of the ion with the ligand is discussed. Ligand field splitting is reported.
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