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Zero-Dimensional Gua3SbCl6 Crystals as Intrinsically Reabsorption-Free Scintillators for Radiation Detection |
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| Authors: | Matteo L Zaffalon Ye Wu Francesca Cova Luca Gironi Xiaoming Li Valerio Pinchetti Yang Liu Muhammad Imran Alessia Cemmi Ilaria Di Sarcina Liberato Manna Haibo Zeng Sergio Brovelli |
| Affiliation: | 1. Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, Via R. Cozzi 55, IT-20125 Milano, Italy;2. MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, School of Materials Science and Engineering Nanjing University of Science and Technology, Nanjing, 210094 China
Istituto Italiano di Tecnologia, Via Morego 30, IT-16163 Genova, Italy;3. Dipartimento di Fisica, Università degli Studi Milano Bicocca, Piazza della Scienza 3, IT-20126 Milano, Italy INFN Sezione Milano – Bicocca, Piazza della Scienza 3, Milano, IT-20126 Italy;4. MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, School of Materials Science and Engineering Nanjing University of Science and Technology, Nanjing, 210094 China;5. MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, School of Materials Science and Engineering Nanjing University of Science and Technology, Nanjing, 210094 China CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Department of Physical Chemistry, Campus Universitario Lagoas Marcosende, Vigo, 36310 Spain;6. Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4 Canada;7. ENEA Fusion and Technology for Nuclear Safety and Security Department, Casaccia R.C., Rome, 00123 Italy;8. Istituto Italiano di Tecnologia, Via Morego 30, IT-16163 Genova, Italy |
| 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. |
| Keywords: | metal halides radioluminescence scintillators thermally stimulated luminescence zero-dimensional crystals |