TY - GEN
T1 - Luminescence and scintillation of Cs3Cu2I5:Tl and Cs3Cu2I5:Ag scintillators
AU - Kim, Hong Joo
AU - Luan, Nguyen Thanh
N1 - Publisher Copyright:
© 2024 SPIE.
PY - 2024
Y1 - 2024
N2 - The inorganic scintillation crystal, Cs3Cu2I5, has garnered considerable interest from the nanocrystal, thin film, and bulk crystal communities. Its non-toxic composition, cost-effectiveness, air stability, good light yield, high density, reasonable decay time, and visible wavelength compatibility with several photodetectors make the bulk Cs3Cu2I5 crystal a promising candidate for a wide range of applications, including optoelectronics, X-ray and γ-ray radiation detection. Further studies reveal a low-dimensional metal halide structure with a suggested self-trapped exciton and complex trap processes. This implies that there is potential for further research into the luminescence and scintillation of this crystal to optimize its performance. Based on the self-trapped exciton mechanism with the goal of room-temperature application, activated scintillation has been considered. The monovalent activation center could be a good candidate for study. Following the same concept in well-known CsI crystals, the Cs3Cu2I5:Tl and Cs3Cu2I5:Ag crystals were studied in this work. These crystals were synthesized and grown using the Bridgman technique. The good parts of the crystal were cut and polished. The scintillation characteristics were measured using the Hamamatsu R6233-100 photomultiplier tube (PMT) with emission wavelengths well-matched to these crystals. Data acquisition and analysis were performed using a 500-MHz flash analog-to-digital converter (Notice, Korea) with a CERN ROOT-based program. The absolute light yield was measured using the PMT single photoelectron technique. The pulse shape study, including decay time and particle discrimination, was investigated for γ rays and α particles. The charge comparison method with optimization was used for pulse shape discrimination. Our results showed the potential application not only for X-ray and γ-ray measurements but also for α measurements. However, the unexpected inverse performance of these activation centers was observed, leading to the motivation for luminescence investigation. This work compared the X-ray luminescence of these doped crystals to other related crystals. For this purpose, CsI, CsI:Cu, CsI:Ag, and intrinsic Cs3Cu2I5 crystals were grown. It suggests a complex energy transfer to the Tl+ and Ag+ activation centers regarding the Cu+ ion in the electronic structure. Our study indicates that these crystals have the potential to be effective scintillators for room-temperature applications. These applications include radiation detection and measurement (X-rays, γ rays, and α particles), radiography (such as medical imaging and defect inspection), and rare event searches as promising candidates for dark matter search.
AB - The inorganic scintillation crystal, Cs3Cu2I5, has garnered considerable interest from the nanocrystal, thin film, and bulk crystal communities. Its non-toxic composition, cost-effectiveness, air stability, good light yield, high density, reasonable decay time, and visible wavelength compatibility with several photodetectors make the bulk Cs3Cu2I5 crystal a promising candidate for a wide range of applications, including optoelectronics, X-ray and γ-ray radiation detection. Further studies reveal a low-dimensional metal halide structure with a suggested self-trapped exciton and complex trap processes. This implies that there is potential for further research into the luminescence and scintillation of this crystal to optimize its performance. Based on the self-trapped exciton mechanism with the goal of room-temperature application, activated scintillation has been considered. The monovalent activation center could be a good candidate for study. Following the same concept in well-known CsI crystals, the Cs3Cu2I5:Tl and Cs3Cu2I5:Ag crystals were studied in this work. These crystals were synthesized and grown using the Bridgman technique. The good parts of the crystal were cut and polished. The scintillation characteristics were measured using the Hamamatsu R6233-100 photomultiplier tube (PMT) with emission wavelengths well-matched to these crystals. Data acquisition and analysis were performed using a 500-MHz flash analog-to-digital converter (Notice, Korea) with a CERN ROOT-based program. The absolute light yield was measured using the PMT single photoelectron technique. The pulse shape study, including decay time and particle discrimination, was investigated for γ rays and α particles. The charge comparison method with optimization was used for pulse shape discrimination. Our results showed the potential application not only for X-ray and γ-ray measurements but also for α measurements. However, the unexpected inverse performance of these activation centers was observed, leading to the motivation for luminescence investigation. This work compared the X-ray luminescence of these doped crystals to other related crystals. For this purpose, CsI, CsI:Cu, CsI:Ag, and intrinsic Cs3Cu2I5 crystals were grown. It suggests a complex energy transfer to the Tl+ and Ag+ activation centers regarding the Cu+ ion in the electronic structure. Our study indicates that these crystals have the potential to be effective scintillators for room-temperature applications. These applications include radiation detection and measurement (X-rays, γ rays, and α particles), radiography (such as medical imaging and defect inspection), and rare event searches as promising candidates for dark matter search.
KW - absolute light yield
KW - Ag activator
KW - Cs3Cu2I5 crystal
KW - luminescence
KW - pulse shape discrimination
KW - scintillation
KW - Tl activator
UR - http://www.scopus.com/inward/record.url?scp=85208534536&partnerID=8YFLogxK
U2 - 10.1117/12.3027418
DO - 10.1117/12.3027418
M3 - Conference contribution
AN - SCOPUS:85208534536
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI
A2 - Cherepy, Nerine J.
A2 - Fiederle, Michael
A2 - James, Ralph B.
PB - SPIE
T2 - Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI 2024
Y2 - 19 August 2024 through 21 August 2024
ER -