Studies of Radiation-Induced Defects in Li₂SiO₃:Sm Phosphor Material

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• 作者：N. Singh ; Vijay Singh ; S. Watanabe ; T. K. Gundu Rao…
• 关键词：Thermoluminescence ; combustion ; phosphor ; defect centers ; electron spin resonance
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：46
• 期：1
• 页码：451-457
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

Li₂SiO₃:Sm was synthesized by the solution combustion method. Powder x-ray diffraction technique was used to find the phase formation. Li₂SiO₃:Sm exhibits thermoluminescence (TL) peaks at approximately 140°C, 155°C, 190°C, 250°C, and 405°C. Three defect centers contribute to the observed electron spin resonance spectrum from the gamma irradiated phosphor. Center I with principal g-values g_|| = 2.0206 and g_⊥ = 2.0028 is identified as an O₂− ion while center II, with an isotropic g-factor 2.0039, is assigned to an F+-type center. Center III is assigned to a Ti3+ center. The Ti3+ center is related to the 250°C TL peak while the O₂− ion also correlates with the main TL peak at 250°C. An additional defect center is observed during thermal annealing experiments, and the center (assigned to F+ center) seems to originate from an F center. The F center appears to be associated with the high temperature TL peak in a Li₂SiO₃:Sm phosphor. The luminescence spectrum reveals the dominant emission peaks at 605 (4G_5/2 → ^{6H_7/2) nm under the excitation wavelength of 402 nm.}