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Thermoluminescence and scintillation properties of LuAP and YAP

Author:
J Glodo   A.J Wojtowicz  


Journal:
Journal of Alloys and Compounds


Issue Date:
2000


Abstract(summary):

In this communication we report on the application of low temperature thermoluminescence (ltTL) associated with shallow traps in the research on scintillation properties of cerium doped LuAP and YAP crystals. We show that existence of shallow traps and their interference with the scintillation process readily explain changes in light yield and time profiles with temperature. The analysis of two major glow peaks at 183 and 270 K of LuAP:Ce yields trap parameters: The activation energy E=0.507 eV; the frequency factor s=3.65times10 12 s -1 and E=0.786 eV; s=1.77times10 13 s -1, respectively. A glow curve of YAP:Ce also shows two major glow peaks at 108 K and 154 K, although this case is more complex and involves a distribution in the energies. Assuming a Gaussian distribution with the standard deviation sigmacong0.018 eV we find trap parameters to be: E=0.30 eV (the mean); s=5times10 12 s -1 and E=0.5 eV; s=7times10 14 s -1, respectively. Then using the obtained trap parameters we calculate examples of time profiles and light yield characteristics to compare them to the experimental results


Page:
0-294


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