Title :
Effects of Calcium Codoping on Charge Traps in LSO:Ce Crystals
Author :
Yang, Kan ; Melcher, Charles L. ; Rack, Philip D. ; Eriksson, Lars A.
Author_Institution :
Dept. of Mater. Sci. & Eng., Univ. of Tennessee, Knoxville, TN, USA
Abstract :
Experimental studies of Lu2SiO5:Ce (LSO:Ce) crystals codoped with various concentrations of Ca (0, 0.1, 0.2, 0.3, and 0.4 at% in the melt) are presented. The scintillation and optical properties including photoluminescence decay, emission, excitation, absorption, afterglow and thermoluminescence properties are investigated as a function of Ca concentration. Experimental data show Ca codoping significantly reduces the trapped charge population in the crystal matrix. Hence, the scintillation decay time of LSO:Ce is shortened and the afterglow is suppressed. Thermoluminescence studies show a strong correlation between the integrated thermoluminescence intensity and the Ca concentration.
Keywords :
afterglows; calcium; cerium; doping; lutetium compounds; photoluminescence; scintillation; thermoluminescence; LSO:Ce crystals; Lu2SiO5:Ce,Ca; afterglow properties; calcium codoping; calcium concentrations; charge traps; integrated thermoluminescence intensity; optical properties; photoluminescence decay; scintillation decay time; trapped charge population; Absorption; Biomedical engineering; Calcium; Crystalline materials; Crystals; Luminescence; Materials science and technology; Photoluminescence; Temperature; X-rays; ${rm Lu}_{2}{rm SiO}_{5}$ (LSO); Calcium; codoping; scintillation;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2009.2027018
