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Low temperature (35 K) measurements of the scintillation kinetics of Y₂ {SiO}₅: Ce (YSO: Ce) have previously illustrated that shallow electron traps can play an important role in the scintillation mechanism. In addition, divalent calcium co-doping of isostructural {Lu}₂ {SiO}₅: Ce (LSO: Ce) has been shown to eliminate shallow electron traps and decrease scintillation decay time while maintaining high light output. Here we investigate the effect of {Ca}^2+codoping on the trap populations and scintillation kinetics of YSO: Ce. Single crystals were grown with {Ca}^2+concentrations up to 0. 5 at% relative to Y. Thermoluminescence measurements indicate a significant reduction in shallow traps, and a marked change in the scintillation kinetics can be seen in the scintillation time profiles as a result of {Ca}^2+codoping.
Rothfuß et al. (Mon,) studied this question.