Scintillation and photoluminescence properties of (Tl1-xAx)MgCl3 (where A = alkali metal)
Scintillation and photoluminescence properties of (Tl1-xAx)MgCl3 (where A = alkali metal)
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(Tl1-xAx)MgCl3 的闪烁和光致发光特性（其中 A = 碱金属）
DOI：
10.1016/j.jallcom.2020.153871
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发表时间：
2020
影响因子：
6.2
通讯作者：
Asai Keisuke
中科院分区：
文献类型：
--
作者：
Arai Miki;Fujimoto Yutaka;Koshimizu Masanori;Yanagida Takayuki;Asai Keisuke
我们开发了（Tl 1 −xAx）MgCl 3（A = Li、Na、K、Rb和Cs）晶体闪烁体，以通过阳离子取代来改善TlMgCl 3的闪烁特性，我们先前已经报道了TlMgCl 3的良好闪烁特性（光产额= 46，000光子/MeV，闪烁衰减时间常数= 60 ns（≤ 25%）和350 ns（≤ 75%））。这些（Tl 1 −xAx）MgCl 3晶体的X射线诱导闪烁光谱在420 nm处显示出强发射带，这对应于TlMgCl 3观察到的波长。这意味着（Tl 1 −xAx）MgCl 3的发光机制与TlMgCl 3类似。（Tl0.995K0.005）MgCl_3（55，000光子/MeV）和（Tl0.995Cs0.005）MgCl_3（49，000光子/MeV）的光产额高于TlMgCl_3（46，000光子/MeV）。这是由于电子-空穴对的数量增加，导致闪烁，这是由于被捕获的电子和空穴的数量减少，如热释光的较低强度所揭示的。结果，我们成功地通过阳离子取代增加了光产额。
We developed (Tl1−xAx)MgCl3(A = Li, Na, K, Rb, and Cs) crystalline scintillators to improve by cation substitution the scintillation properties of TlMgCl3,for which we have previously reported good scintillation properties (light yield = 46,000 photons/MeV and scintillation decay time constants = 60 ns (∼25%) and 350 ns (∼75%)). The X-ray-induced scintillation spectra of these (Tl1−xAx)MgCl3scintillators exhibited an intense emission band at 420 nm, which corresponds to the wavelength observed for TlMgCl3. This means that the light-emitting mechanisms of (Tl1−xAx)MgCl3are similar to that in TlMgCl3. The light yields of (Tl0.995K0.005)MgCl3(55,000 photons/MeV) and (Tl0.995Cs0.005)MgCl3(49,000 photons/MeV) were higher than that of TlMgCl3(46,000 photons/MeV). This is attributed to the increased number of electron–hole pairs contributing to the scintillation owing to the decreased number of trapped electrons and holes, as revealed by the lower intensity of thermoluminescence. As a result, we succeeded in increasing the light yields by cation substitution.