Optical and Scintillation Properties of Record-Efficiency CdTe Nanoplatelets toward Radiation Detection Applications

Abhinav Anand^a, Matteo Zaffalon^a, Francesca Cova^a, Valerio Pinchetti^a, Ali Hossain Khan^b, Francesco Carulli^a, Rosaria Brescia^c, Francesco Meinardi^a, Iwan Moreels^b, Sergio Brovelli^a

^aDipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, 20125 Milano, Italy

^bDepartment of Chemistry, Ghent University, 9000 Ghent, Belgium

^cElectron Microscopy Facility, Istituto Italiano di Tecnologia, 16163 Genova, Italy

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)

#2DSUSY - 2D Nanomaterials for Sustainable Energy

VALÈNCIA, Spain, 2023 March 6th - 10th

Organizers: Maria Antonia Herrero Chamorro and Maurizio Prato

Oral, Matteo Zaffalon, presentation 139
DOI: https://doi.org/10.29363/nanoge.matsus.2023.139
Publication date: 22nd December 2022

Colloidal CdTe nanoplatelets featuring a large absorption coefficient and ultrafast tunable luminescence coupled with heavy-metal-based composition present themselves as highly desirable candidates for radiation detection technologies [1]. Historically, however, these nanoplatelets have suffered from poor emission efficiency, hindering progress in exploring their technological potential [2], [3]. In this talk, we report the synthesis of CdTe nanoplatelets possessing a record emission efficiency of 9%. This enables us to investigate their fundamental photophysics using ultrafast transient absorption, temperature-controlled photoluminescence, and radioluminescence measurements, elucidating the origins of exciton- and defect-related phenomena under both optical and ionizing excitation. For the first time in CdTe nanoplatelets, in this talk is reported the cumulative effects of a giant oscillator strength transition (GOST) and exciton fine structure. Simultaneously, thermally stimulated luminescence measurements reveal the presence of both shallow and deep trap states and allow us to disclose the trapping and detrapping dynamics and their influence on the scintillation properties [4].

References:

[1] Turtos, R. M.; Gundacker, S.; Omelkov, S.; Mahler, B.; Khan, A. H.; Saaring, J.; Meng, Z.; Vasil’ev, A.; Dujardin, C.; Kirm, M.; Moreels, I.; Auffray, E.; Lecoq, P. On the Use of CdSe Scintillating Nanoplatelets as Time Taggers for High-Energy Gamma Detection. npj 2D Mater. Appl. 2019, 3 (1), 37

[2] Son, J. S.; Wen, X.-D.; Joo, J.; Chae, J.; Baek, S.; Park, K.; Kim, J. H.; An, K.; Yu, J. H.; Kwon, S. G.; Choi, S.-H.; Wang, Z.; Kim, Y.-W.; Kuk, Y.; Hoffmann, R.; Hyeon, T. Large-Scale Soft Colloidal Template Synthesis of 1.4 Nm Thick CdSe Nanosheets. Angew. Chemie 2009, 121 (37), 6993–6996

[3] Ithurria, S.; Tessier, M. D.; Mahler, B.; Lobo, R. P. S. M.; Dubertret, B.; Efros, A. L. Colloidal Nanoplatelets with Two-Dimensional Electronic Structure. Nat. Mater. 2011, 10 (12), 936–941

[4] Zaffalon, M. L.; Cova, F.; Liu, M.; Cemmi, A.; Di Sarcina, I.; Rossi, F.; Carulli, F.; Erroi, A.; Rodà, C.; Perego, J.; Comotti, A.; Fasoli, M.; Meinardi, F.; Li, L.; Vedda, A.; Brovelli, S. Extreme γ-Ray Radiation Hardness and High Scintillation Yield in Perovskite Nanocrystals. Nat. Photonics 2022, 16 (12), 860–868

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