1. Zero-Dimensional Gua3SbCl6 Crystals as Intrinsically Reabsorption-Free Scintillators for Radiation Detection.
- Author
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Zaffalon, Matteo L., Wu, Ye, Cova, Francesca, Gironi, Luca, Li, Xiaoming, Pinchetti, Valerio, Liu, Yang, Imran, Muhammad, Cemmi, Alessia, Di Sarcina, Ilaria, Manna, Liberato, Zeng, Haibo, and Brovelli, Sergio
- Subjects
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SCINTILLATORS , *STOKES shift , *RADIATION , *OPTICAL materials , *RADIOLUMINESCENCE , *OPTICAL properties - Abstract
The search for efficient, re-absorption-free scintillators has recently focused the attention on antimony-based halides, which exhibit largely Stokes shifted luminescence due to radiative recombination of excitons self-trapped (STE) in strongly Jahn-Teller distorted Sb3+ color centers. Here, the synthesis of a hybrid structure is reported with chemical formula (C13H14N3)3SbCl6 consisting of spatially isolated [SbCl6]3- octahedra separated by organic N, N'-diphenylguanidinium (Gua) molecules. The optical properties of this material are mainly determined by the inorganic component and are characterized by a pronounced Stokes shift of "1.3 eV and a room-temperature photoluminescence (PL) efficiency of up to 85%. Remarkably, highly efficient radioluminescence (RL) is observed with scintillation light yields of "2000 ph MeV-1 using both soft X-rays and a 124 keV gamma source. Temperature-dependent PL and RL measurements confirm the minor role of non-radiative channels, which are completely suppressed below 100 K. Thermally stimulated luminescence measurements suggest that the traps in Gua3SbCl6 crystals have a significantly large energy depth distribution below the absorbing state. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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