CsBr:(Eu2+,KOH)粉体光激励发光和抗辐照性能研究

doi:10.3724/SP.J.1077.2013.12373

摘要/Abstract

摘要：

采用高温固相烧结法制备了KOH 掺杂的CsBr: (Eu²⁺, KOH)粉体, 通过对材料体系荧光光谱、光激励发光谱、拉曼光谱和光激励发光衰减时间等的系统研究, 深入分析了KOH对CsBr:Eu²⁺粉体光激励发光性能和抗辐照性能的影响。研究结果表明, 掺杂引入的OH^-离子增加了无辐射跃迁的几率, 随着KOH浓度的增大, CsBr:(Eu²⁺, KOH)粉体的光激励发光衰减时间逐渐缩短。同时, 由于K⁺和OH^-离子的共同作用, 使材料中Eu离子周围空位浓度减少, 避免了因Eu²⁺聚集而导致的浓度淬灭, 使CsBr:(Eu²⁺,KOH)粉体的抗辐照性能增强。

关键词: CsBr:Eu²⁺, KOH, 光激励发光, 抗辐照

Abstract:

CsBr: (Eu²⁺, KOH) powders were prepared by solid-state reaction. The photo luminescence (PL) spectra, photostimulated luminescence (PSL) spectra, Raman spectra and PSL lifetime spectra were systematically investigated, and the influence of KOH-adding on photostimulated luminescence and radiation hardness properties were discussed. The results reveal that the probability of radiationless transition increase due to hydroxyl ion (OH^-), with the increasing of concentration of KOH, the PSL decay time of CsBr:(Eu²⁺,KOH) shortens gradually. Furthermore, the vacancy concentration around Eu²⁺ decreases due to the existence of K⁺ and OH^-, which avoid the concentration quenching by the aggregation of Eu²⁺ and improves the radiation hardness of CsBr: Eu²⁺.

Key words: CsBr:Eu²⁺, KOH, photostimulated luminescence, radiation hardness

中图分类号:

TN304

孟佳, 赵丽丽, 宋力昕. CsBr:(Eu²⁺,KOH)粉体光激励发光和抗辐照性能研究[J]. 无机材料学报, 2013, 28(5): 551-556.

MENG Jia, ZHAO Li-Li, SONG Li-Xin. Photostimulated Luminescence and Radiation Hardness Properties of CsBr:(Eu²⁺,KOH)[J]. Journal of Inorganic Materials, 2013, 28(5): 551-556.

图/表 9

图1 CsBr:(Eu2+,5mol%KOH)粉体PL和PSL光谱

Fig. 1 PL and PSL spectra of CsBr:(Eu2+,5mol%KOH) powders

图2 CsBr: Eu2+、CsBr:(Eu2+,OH)和CsBr:(Eu2+, KOH)粉体的PSL发射光谱

Fig. 2 PSL emission spectra of CsBr: Eu2+ and CsBr: (Eu2+, KOH) powders

图3 添加不同浓度KOH的CsBr:(Eu2+,KOH)粉体PL激发光谱

Fig. 3 PL excitation spectra of CsBr:(Eu2+,KOH) powders adding with different KOH contents

图4 添加不同浓度KOH的CsBr:(Eu2+, KOH)粉体PL发射光谱

Fig. 4 PL emission spectra of CsBr:(Eu2+, KOH) powders adding with different KOH contents (a) 5mol%KOH; (b) 2mol%KOH; (c) 0.5mol%KOH

图5 添加不同浓度KOH的CsBr:(Eu2+, KOH)粉体拉曼光谱

Fig. 5 Raman spectra of CsBr:(Eu2+, KOH) powders adding with different KOH contents (a) Pure; (b) 0.5mol%KOH; (c) 2mol%KOH; (d) 5mol%KOH

Table 1 Fitting results of the PSL lifetime measurement

Sample	τ₁/ns	B₁/%	χ²
5mol%KOH	663	100	1.026
2mol%KOH	689	100	1.114
0.5mol%KOH	745	100	1.101

图6 添加不同浓度KOH的CsBr:(Eu2+, KOH)粉体的发光衰减时间

Fig. 6 PSL lifetime spectra of CsBr:(Eu2+, KOH) powders adding with different KOH contents

图7 CsBr:Eu2+和CsBr: (Eu2+,KOH)光激励发光强度与辐照剂量的关系

Fig. 7 PSL yield of CsBr:Eu2+ and CsBr: (Eu2+, KOH) with accumulated X-ray dose

图8 CsBr:Eu2+结构示意图(a) MEu中心和(b) KOH掺杂

Fig. 8 Configuration of CsBr:Eu2+ (a) MEu-center and (b) KOH-doped

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CsBr:(Eu²⁺,KOH)粉体光激励发光和抗辐照性能研究

Photostimulated Luminescence and Radiation Hardness Properties of CsBr:(Eu²⁺,KOH)

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