Molecular Sensitization Enabled High Performance Organic Metal Halide Hybrid Scintillator
Molecular Sensitization Enabled High Performance Organic Metal Halide Hybrid Scintillator
复制标题
分子敏化高性能有机金属卤化物混合闪烁体
DOI：
10.1002/adma.202301612
复制
发表时间：
2023
影响因子：
29.4
通讯作者：
Stand, Luis M.
中科院分区：
文献类型：
--
作者：
Shonde, Tunde Blessed;Chaaban, Maya;Liu, He;Olasupo, Oluwadara Joshua;Ben‐Akacha, Azza;Gonzalez, Fabiola G.;Julevich, Kerri;Lin, Xinsong;Winfred, J. S. Raaj Vellore;Stand, Luis M.
闪烁体是医学成像和安全检查设备中的重要组件之一，严重依赖含稀土的无机材料。在这里，报道了一种新型的有机-无机杂化材料，其含有地球丰富的元素，可以通过低温工艺制备。利用聚集诱导发射（AIE）有机卤化物4-（4-（二苯基氨基）苯基）-1-（丙基）-吡啶-1溴化鎓（TPA-PBr）和金属卤化物溴化锌（ZnBr 2）的室温共结晶，开发了具有黄色-绿色发射峰的零维（0 D）有机金属卤化物杂化物（TPA-P）2 ZnBr 4。在这种杂化材料中，通过ZnBr 42 −的敏化作用，TPA‐P+的X射线闪烁得到了显著增强。发现（TPA-P）2 ZnBr 4的绝对光产额（14，700 ± 800光子/MeV）高于蒽的绝对光产额（14，700 ± 800光子/MeV），蒽是一种众所周知的有机闪烁体，而其X射线吸收与无机闪烁体相当。以TPA-P+为发射中心，实现了3.56和9.96 ns的短光致发光和辐射发光衰减寿命。利用金属卤化物的高X射线吸收和有机阳离子的短衰变寿命的有效辐射发光的优点，材料设计为同时解决有机发光剂的低X射线吸收和无机发光剂的长衰变寿命的问题铺平了新的途径。
Scintillators, one of the essential components in medical imaging and security checking devices, rely heavily on rare‐earth‐containing inorganic materials. Here, a new type of organic‐inorganic hybrid scintillators containing earth abundant elements that can be prepared via low‐temperature processes is reported. With room temperature co‐crystallization of an aggregation‐induced emission (AIE) organic halide, 4‐(4‐(diphenylamino) phenyl)‐1‐(propyl)‐pyrindin‐1ium bromide (TPA‐PBr), and a metal halide, zinc bromide (ZnBr2), a zero‐dimensional (0D) organic metal halide hybrid (TPA‐P)2ZnBr4with a yellowish‐green emission peaked at 550 nm has been developed. In this hybrid material, dramatically enhanced X‐ray scintillation of TPA‐P+is achieved via the sensitization by ZnBr42−. The absolute light yield (14,700 ± 800 Photons/MeV) of (TPA‐P)2ZnBr4is found to be higher than that of anthracene (≈13,500 Photons/MeV), a well‐known organic scintillator, while its X‐ray absorption is comparable to those of inorganic scintillators. With TPA‐P+as an emitting center, short photoluminescence and radioluminescence decay lifetimes of 3.56 and 9.96 ns have been achieved. Taking the advantages of high X‐ray absorption of metal halides and efficient radioluminescence with short decay lifetimes of organic cations, the material design paves a new pathway to address the issues of low X‐ray absorption of organic scintillators and long decay lifetimes of inorganic scintillators simultaneously.