Journal
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Volume 56, Issue 1, Pages 320-327Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TNS.2008.2011269
Keywords
LuAG:Pr; light yield; scintillation mechanism; trap
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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 (mu PD) technique. The research comprises the measurements of X-ray excited emission spectra and Cs-137 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.
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