Exciton-harvesting enabled efficient charged particle detection in zero-dimensional halidesOACSTPCD
Exciton-harvesting enabled efficient charged particle detection in zero-dimensional halides
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.Low-dimensional 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 exciton-exciton 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)Cs3Cu2I5∶Tl halide single crystals by forming strongly localized Tl-bound excitons.Because of the suppression of non-radiative exciton-exciton interaction,an excellent α/β pulse-shape-discrimination(PSD)figure-of-merit(FoM)factor of 2.64,a superior rejection ratio of 10-9,and a high scintillation yield of 26 000 photons MeV-1 under 5.49 MeV α-ray are achieved in Cs3Cu2I5∶Tl single crystals,outperforming the commercial ZnS:Ag/PVT composites for charged particle detection applications.Furthermore,a radiation detector prototype based on Cs3Cu2I5: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.
Qian Wang;Martin Nikl;Xilei Sun;Xiaoping OuYang;Yuntao Wu;Chenger Wang;Hongliang Shi;Jie Chen;Junye Yang;Alena Beitlerova;Romana Kucerkova;Zhengyang Zhou;Yunyun Li
Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,ChinaDepartment of Optical Materials,Institute of Physics of the Czech Academy of Sciences,Prague 16200,Czech RepublicInstitute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,ChinaNorthwest Institute of Nuclear Technology,Xi'an 710024,ChinaInstitute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China||National Engineering Research Center for Rare Earth,Grirem Advanced Materials Co.,Ltd.and General Research Institute for Nonferrous Metals,Beijing 100088,ChinaDepartment of Physics,Beihang University,Beijing 100191,ChinaInstitute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China||Spallation Neutron Source Science Center,Dongguan 523803,China
《光：科学与应用（英文版）》 2024 (009)
1944-1955 / 12
Thanks to Xuemin Wen and Qiang Gao for the help on single crystal growth,and Dr.Haodi Wu from Huazhong University of Science and Technology for the help on the refractive index measurements.Thanks to 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).
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