| Summary: | Lu<sub>2</sub>O<sub>3</sub>:1%Eu and Lu<sub>2</sub>O<sub>3</sub>:8%Eu series single crystals were grown by optical floating zone method under air, N<sub>2</sub>, and H<sub>2</sub>-Ar mixed atmosphere (5 vol%H<sub>2</sub> and 95 vol%Ar). The effects of preparation atmosphere and doping concentration on the scintillation and photoluminescence properties have been investigated and discussed. Correlated measurements of afterglow curves, X-ray excited luminescence spectra, photoluminescence excitation and photoluminescence, photoluminescence decay, and thermal stimulated luminescence curves were performed. Although Eu(S<sub>6</sub>) luminescence can be significantly depressed under oxidizing atmosphere, Lu<sub>2</sub>O<sub>3</sub>:8%Eu grown under weak reducing atmosphere presents the lowest afterglow intensity. This phenomenon was explained by different interstitial oxygen atom concentrations in the samples.
|
|---|