A study of radiation effects on LuAG:Ce(Pr) co-activated with Ca

作者：Petrosyan A G^*; Ovanesyan K L; Derdzyan M V; Ghambaryan I; Patton G; Moretti F; Auffray E; Lecoq P; Lucchini M; Pauwels K; Dujardin C

来源：Journal of Crystal Growth, 2015, 430: 46-51.

DOI：10.1016/j.jcrysgro.2015.08.019

• Doping
• Radiation damage
• Rare-earth compounds
• Scintillator materials

Single crystals of LuAG:Ce co doped with Ca2+ were grown by the vertical Bridgman method and studied for optical properties, gamma-irradiation induced absorption, scintillation light yield and decay. It is shown that addition of Ca2+ may efficiently limit the radiation induced absorption associated with presence of trace amounts of Yb. In bulk crystals with balanced Ca2+/Ce concentration the absorption induced in the emission range around 520 nm is less than 1 m(-1), after the dose 1 kGy and 860 Gy/h dose rate. The light yield of LuAG:Ce upon co doping with Ca2+ is preserved, while the fraction of the delayed recombination leading to slow scintillation components is decreased. The effects of Ca2+ were not favorable in Pr-doped LuAG studied so far. The absorption induced in the emission range around 300-400 nm range in the Ca-free LuAG:Pr, after the irradiation dose 1 kGy, is about 35 m (1), while it is above 100 m in the Ca co-doped LuAG:Pr.

• 出版日期2015-11-15