Optical Properties and Defect Study of Ca²⁺ Co-Doping Lu₂Si₂O₇:Ce³⁺ Single Crystal Scintillator

Abstract:

Single crystal of Lu2Si2O7 (LPS):0.5%Ce,0.1%Ca was grown by the Czochralski method. The X-ray excited luminescence (XEL), photoluminescence excitation (PLE), photoluminescence (PL) and transmittance spectra were measured and discussed. The as grown LPS:Ce,Ca sample presents excellent optical quality with 81% transmittance. Two absorption peaks locate at 300 and 350 nm, corresponding to the electron transition of Ce3+ from 4f ground to 5d1 and 5d2 respectively. According to the Gaussian fitting, the XEL curve of LPS:Ce,Ca can be fitted into two peaks centering at 378 and 407 nm respectively. It is found that the addition of Ca2+ in LPS:Ce introduces more oxygen vacancies, leading to the decreases of the luminescence efficiency of LPS:Ce. Through the thermally stimulated luminescence (TSL) measurement, two kinds of charge trap are found in LPS:Ce,Ca, whose energy depths are 1.20 and 1.47 eV. The trap at 1.20 eV is intrinsic electron trap induced by Ce3+ doping in LPS host and the other trap is formed by the both impact of and defects.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 616-621
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.616
• Online since: January 2013
• Authors: He Feng, Guo Hao Ren, Dong Zhou Ding, Huan Ying Li, Fang Lei
• Keywords: Ca ²⁺ Co-Doping, Charge Traps, Lu₂Si₂O₇:Ce, Optical Property, Scintillation Crystal

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