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Effect of Electron Traps on Scintillation of Praseodymium Activated Lu _3 Al _5 O _{12}

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7 Author(s)
Drozdowski, W. ; Fac. of Appl. Sci., Delft Univ. of Technol., Delft ; Dorenbos, P. ; Drozdowska, R. ; Bos, A.J.J.
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In this paper we present the studies performed on a set of Lu3Al5O12:Pr (LuAG:Pr) crystals with praseodymium concentration between 1.5 and 10%, grown by the micro-pulling-down (muPD) technique. The research comprises the measurements of X-ray excited emission spectra and 137Cs gamma-ray pulse height spectra in a range from 78 to 600 K, and thermoluminescence glow curves. Based on experimental data we discuss the dependence of scintillation properties of Lu3Al5O12:Pr on praseodymium content and temperature. The main attention is focused on a distinct increase of scintillation yield with temperature, which we attribute to existence of shallow electron traps and their temperature-dependent contribution to scintillation of LuAG:Pr. An active role of traps is demonstrated by a novel experiment combining X-ray and laser excitation.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:56 ,  Issue: 1 )

Date of Publication:

Feb. 2009

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