The role and effect of stable Ce4+centers in Ce-doped LuAG single crystal scintillator is further studied by means of measurements of several optical, luminescence and scintillation characteristics. Two LuAG:Ce single crystal samples are compared: in one of them the dominating Ce4 +center is stabilized by high concentration Mg2+codoping while the other one shows only the presence of stable Ce3 +center. Tailored (Eu, Mg)-doped LuAG single crystal is also prepared to test the presence and thermal stability of hole traps in the host which affect the timing characteristics of Ce4+scintillation cycle, namely its restoration back to 4+ charge state in last step of the cycle. EPR experiment was also employed at Mg- and (Eu, Mg) doped LuAG samples and the signature of the O-hole center stabilized by Mg2 +ion was clearly obtained.
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Nikl et al. (2016) studied this question.
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