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Crystal growth and scintillating properties of (Pr, Si)-doped YAlO3

Mariya Zhuravleva 1Andrey Novoselov 1Akira Yoshikawa 1Jan Pejchal 2Martin Nikl 2Jiri A. Mares 2Anna Vedda 3Tsuguo Fukuda 1

1. Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
2. Czech Academy of Sciences, Institute of Physics, Cukrovarnicka 10, Prague 16253, Czech Republic
3. University of Milano-Bicocca, Department of Materials Science, via Cozzi 53, Milano 20125, Italy


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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Submitted: 2007-01-15 04:43
Revised:   2009-06-07 00:44