Fast scintillators such as Ce³⁺-doped YAlO₃, Gd₂SiO₅ and Lu₂SiO₅ have found numerous applications in industry, high-energy physics and medical imaging techniques. An analogous to the fast 5d - 4f luminescence of Ce³⁺, high energy shifted and even faster emission can be obtained from the 5d - 4f transition of the Pr³⁺ in host matrices with the medium-strength crystal field. Trying to find an appropriate host, we have recently reported luminescence properties of Pr³⁺-doped Lu₃Al₅O₁₂, Y₃Al₅O₁₂, Y₂SiO₅ and Lu₂SiO₅ [1]. The Pr-doped YAlO₃ has been reported as well [2]. However, light yield of the Ce-doped scintillating materials is often decreased by electron trapping at point defects, which results in delayed radiative recombination at Ce³⁺. In order to decrease the concentration of oxygen vacancies, codoping by tetravalent ions such as Zr was successfully realized in YAP:Ce [3]. It was also theoretically predicted that an excessive charge introduced by Zr ions in YAP:Ce can reduce the concentration of oxygen vacancies [4].

To continue systematic research work towards obtaining new scintillator materials, we have grown Pr-doped YAlO₃ (0.1, 0.5, 1 and 5 mol%), and Pr (1 mol%), Si (0.02 and 0.1 mol%)-codoped YAlO₃ single crystals by the micro-pulling-down method. Crystal growth results, photo-, radio- and thermo-luminescence, scintillation decay and light yield measurements will be demonstrated. The influence of codoping on scintillator performance of Pr-doped YAlO₃ will be presented and discussed.

[1] M. Nikl et al., J. Cryst. Growth 292 (2006) 416-421.

[2] E.G. Gumanskaya et al., Opt. Spectr. 72 (1992) 155-159 (in Russian).

[3] M.Nikl et al., Nucl. Instr. Meth. Phys. Research A 486 (2002) 250-253.

[4] C.R. Stanek et al., phys. stat. sol. (b) 242 (2005) R113-R115.

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