Exciton-harvesting enabled efficient charged particle detection in zero-dimensional halides  

作　　者：Qian Wang Chenger Wang Hongliang Shi Jie Chen Junye Yang Alena Beitlerova Romana Kucerkova Zhengyang Zhou Yunyun Li Martin Nikl Xilei Sun Xiaoping OuYang Yuntao Wu 

机构地区：[1]Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]National Engineering Research Center for Rare Earth,Grirem Advanced Materials Co.,Ltd.and General Research Institute for Nonferrous Metals,Beijing 100088,China [4]Department of Physics,Beihang University,Beijing 100191,China [5]Spallation Neutron Source Science Center,Dongguan 523803,China [6]Department of Optical Materials,Institute of Physics of the Czech Academy of Sciences,Prague 16200,Czech Republic [7]Northwest Institute of Nuclear Technology,Xi’an 710024,China

出　　处：《Light(Science & Applications)》2024年第9期1944-1955,共12页光（科学与应用)（英文版）

基　　金：the following fundings for support:National Key R&D Program of China(2022YFB3503600);National Natural Science Foundation of China(11975303,12211530561,12305211);Shanghai Municipal Natural Science Foundation(20ZR1473900,21TS1400100);CAS Cooperative Research Project(121631KYSB20210017);CAS Project for Young Scientist in Basic Research(YSBR-024);Partial support received from OP Research,Development,and Education financed by European Structural and Investment Funds,(Czech MEYS project No.SOLID21 CZ.02.1.01/0.0/0.0/16_019/0000760).

摘　　要：Materials for radiation detection are critically important and urgently demanded in diverse fields,starting from fundamental scientific research to medical diagnostics,homeland security,and environmental monitoring.Lowdimensional halides(LDHs)exhibiting efficient self-trapped exciton(STE)emission with high photoluminescence quantum yield(PLQY)have recently shown a great potential as scintillators.However,an overlooked issue of excitonexciton interaction in LDHs under ionizing radiation hinders the broadening of its radiation detection applications.Here,we demonstrate an exceptional enhancement of exciton-harvesting efficiency in zero-dimensional(0D)Cs_(3)Cu_(2)I_(5):Tl halide single crystals by forming strongly localized Tl-bound excitons.Because of the suppression of nonradiative exciton-exciton interaction,an excellentα/βpulse-shape-discrimination(PSD)figure-of-merit(FoM)factor of 2.64,a superior rejection ratio of 10^(−9),and a high scintillation yield of 26000 photons MeV−1 under 5.49 MeVα-ray are achieved in Cs_(3)Cu_(2)I_(5):Tl single crystals,outperforming the commercial ZnS:Ag/PVT composites for charged particle detection applications.Furthermore,a radiation detector prototype based on Cs_(3)Cu_(2)I_(5):Tl single crystal demonstrates the capability of identifying radioactive 220Rn gas for environmental radiation monitoring applications.We believe that the exciton-harvesting strategy proposed here can greatly boost the applications of LDHs materials.

关 键 词：composites particle DIMENSIONAL 

分 类 号：TB30[一般工业技术—材料科学与工程]