Photophysics in Zero-Dimensional Potassium-Doped Cesium Copper Chloride Cs3Cu2Cl5 Nanosheets and Its Application for High-Performance Flexible X-Ray Detection
Photophysics in Zero-Dimensional Potassium-Doped Cesium Copper Chloride Cs3Cu2Cl5 Nanosheets and Its Application for High-Performance Flexible X-Ray Detection
复制标题
零维钾掺杂铯铜氯化物Cs3Cu2Cl5纳米片的光物理及其在高性能柔性X射线检测中的应用
DOI：
10.1002/adom.202102453
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发表时间：
2022-01-21
影响因子：
9
通讯作者：
Jin, Zhiwen
中科院分区：
文献类型：
--
作者：
Han, Lili;Sun, Beibei;Jin, Zhiwen
Zero-dimensional Cs3Cu2Cl5 exhibits intriguing optical properties, which can meet the basic requirements of ideal scintillator application. Here, green emitter Cs3Cu2Cl5 nanosheets are successfully synthesized, and by doping with 2% potassium (K+), their photoluminescence quantum yield (70.23% to 81.39%), radioluminescence intensity, and stability are improved. Further experimental and theoretical studies point out that: (1) K+ brings the neighboring [Cu2Cl5](3-) dimers groups closer, leading to lattice shrinkage and lower lattice constants; (2) such compact crystal structure results in stronger exciton-photon coupling and reduced phonon-electron coupling strength, which is beneficial to form self-trapped excitons and enhanced luminescence; (3) lower lattice constants also induce decreased bandgap (2.58 to 2.51 eV) and increased Stokes shift (217 to 223 nm), for less self-absorption and higher quantum efficiency. Finally, area-controllable uniform flexible Cs3Cu2Cl5:2%K+-polystyrene film is successfully achieved with excellent X-ray sensibility. Such flexible film shows low cost (2.8223 $/g), broadband response (20-160 keV), and high spatial resolution (5 lp mm(-1)) that is comparable to commercial CsI:Tl wafer. Moreover, it fits well with nonplanar surfaces for high-quality medical and industrial flexible images applications. It is believed that this work can provide a viable tactic to enhance X-ray detection in metal halide scintillators.
