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Influence of Self-Absorption and Impurities on Scintillation Properties of (Lu0.1Y0.9)AlO3:Ce Single Crystals

Lu0.1Y0.9AlO3:Ce single crystals in dimensions Ø30×90 mm3 are successfully grown by the Czochralski method. The light output and energy resolution of the crystal in dimensions Ø14×2 mm3 are 9420 photons/MeV and 12.5% respectively. Dependence of the light output on the thickness of the sample is found and explained by the self-absorption in the range of 320–370 nm and the underlying parasitic absorption around 250 nm. In addition, the local enrichment of Ce ions and the presence of low-valent impurity ions may cause the deterioration of its light output. In addition, Lu0.1Y0.9AlO3:Ce has an almost constant fluorescence decay time of 16 ns in the temperature range of 80–373 K.