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Crystal growth and scintillating properties of (Ce, Sr)-doped PrAlO3

Andrey Novoselov 1Akira Yoshikawa 1Jan Pejchal 2Martin Nikl 2Tsuguo 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


Scintillator materials based on the Ce-doping are of persistent interest due to tens-of-ns range decay time depending on the crystal host. Doping PrF3 with Ce3+ was shown to be a novel approach to obtain promising scintillators because of efficient energy transfer from the Pr3+ subsystem to Ce3+-ions via the 1S0 level of Pr3+ [1]. Successful crystal growth of PrAlO3 and results of spectroscopic properties characterization were reported recently [2]. Undoped PrAlO3 hardly ever could be used as a scintillator because of strong concentration quenching of the Pr3+ 5d-4f emission. However, it also points to an enhanced energy migration over the Pr3+-energy levels. On the other hand, a recent study has demonstrated facilitating energy transfer from the Gd3+ sublattice to Ce3+ emission centers by formation of the Ce3+-distorted centers in YF3-GdF3 solid solutions codoped with Me2+ ions such as Sr2+ [3].

To investigate this phenomenon, Ce (1, 2 and 5 mol%)-doped PrAlO3, and Ce (5 mol%), Sr (0.1, 0.5 and 1 mol%)-codoped PrAlO3 single crystals were grown by the micro-pulling-down method. Using the UV and X-ray excitation their luminescence spectra and decay kinetics were investigated. Under X-ray excitation in the undoped PrAlO3 a weak 5d-4f Pr3+ emission occurs within 250-300 nm at room temperature, which is well overlapped with the excitation spectra of Ce3+ emission in YAlO3 host. In such circumstances an efficient energy transfer from the Pr-sublattice to the Ce3+ ions might occur in Ce-doped PrAlO3. Obtained results will be presented and discussed in the light of the (Pr3+)n→Ce3+ energy transfer characteristics and potential of such a material to obtain a fast scintillator of elevated density.

[1] M. Nikl et al., phys. stat. sol. (a) 201 (2004) R108.

[2] D.A. Pawlak et al., J. Cryst. Growth 282 (2005) 260.

[3] M. Nikl et al., J. Phys.: Condens. Matter 18 (2006) 3069-3079.


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Presentation: Oral at Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth, by Andrey Novoselov
See On-line Journal of Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth

Submitted: 2007-01-15 03:44
Revised:   2009-06-07 00:44