Luminescence and scintillation properties of TlMg(Cl1-xBrx)3 crystals
Luminescence and scintillation properties of TlMg(Cl1-xBrx)3 crystals
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DOI：
10.1016/j.materresbull.2019.110589
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发表时间：
2019-12
影响因子：
5.4
通讯作者：
Miki Arai;Y. Fujimoto;M. Koshimizu;H. Kimura;T. Yanagida;K. Asai
中科院分区：
文献类型：
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作者：
Miki Arai;Y. Fujimoto;M. Koshimizu;H. Kimura;T. Yanagida;K. Asai
本文报道了真空条件下用自蔓延凝固法制备的各种TlMg(Cl1-xBrx)3晶体的发光和闪烁特性。TlMg(Cl1-xBrx)3晶体的X射线诱导闪烁光谱的发射峰波长与TlMgCl3晶体的发射峰波长相似。观测到两个指数闪烁衰减时间分量，分别为19 ns(7%)和367 ns(93%)。Tl-Mg(Cl1-xBrx)3的衰变时间与TlMgCl3相似。TlMg(Cl1-xBrx)3(x = 0.0168，59,000光子/MeV)的光产额高于TlMgCl3(˜42,000光子/MeV)，TlMg(Cl1-xBrx)3的光产额在0.5-1.2 摩尔%时达到峰值，随后下降。这可能是由于TlMg(Cl1-xBrx)3(x = 0.0168)的热释光强度比TlMgCl3的低得多，从而减少了晶格缺陷的陷阱。这些结果表明，通过阴离子取代可以成功地改善Tl-Mg(Cl1-xBrx)3晶体闪烁体。
Herein, we report the luminescence and scintillation properties of various TlMg(Cl1-xBrx)3crystals prepared under vacuum via self-seeding solidification. The emission peak wavelengths of the X-ray-induced scintillation spectra for the TlMg(Cl1-xBrx)3crystals were similar to those of TlMgCl3. Two exponential scintillation decay time components of 19 ns (7%) and 367 ns (93%) were observed. The decay times of TlMg(Cl1-xBrx)3were similar to those of TlMgCl3. The light yield of TlMg(Cl1-xBrx)3(x = 0.0168, 59,000 photons/MeV) was higher than that of TlMgCl3(˜42,000 photons/MeV) and the light yield of TlMg(Cl1-xBrx)3peaked at 0.5–1.2 mol% and subsequently declined. This is likely due to the decreased trapping of the lattice defects as confirmed by the significantly lower thermoluminescence intensity of TlMg(Cl1–xBrx)3(x = 0.0168) than that of TlMgCl3. These results indicated that the TlMg (Cl1-xBrx)3crystalline scintillators could be successfully improved via anion substitution.