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

doi:10.3724/SP.J.1077.2013.12373

Abstract

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

CLC Number:

TN304

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.

Figures/Tables 9

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

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

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

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

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

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

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

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

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

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