DOI: https://doi.org/10.29363/nanoge.emlem.2023.036
Publication date: 18th August 2023
The use of scintillators for the detection of ionising radiation is a critical aspect in many fields, including medicine, nuclear monitoring, and homeland security. Lead halide perovskite nanocrystals (LHP-NCs) are emerging as promising scintillator materials. However, the difficulty of affordably upscaling synthesis to the multi-gram level and embedding NCs in optical-grade nanocomposites without compromising their optical properties still limits their widespread use. In addition, fundamental aspects of the scintillation mechanisms are not fully understood, leaving the scientific community without suitable fabrication protocols and rational guidelines for the full exploitation of their potential. In this talk I will present our recent progress in the fabrication of nanocomposite scintillators based on CsPbBr3 NCs synthesised via high throughput approaches. Our data show that the interaction between NCs and polyacrylate chains strengthens the scintillator structure, homogenises the particle size during ripening and is capable of passivating defects on the NC surfaces, resulting in nanocomposite prototypes with high luminescence efficiency, exceptional radiation hardness, competititive scintillation yield even at low NC loading, and ultrafast response time, with a large fraction of the scintillation occurring in the first 80 ps, which is highly promising for fast-time applications in precision medicine and high-energy physics. Additonally, the combination of ultrafast radioluminescence and optical spectroscopies disambiguates the origin of the scintillation kinetics as the result of charged- and multi-exciton recombination formed under ionising excitation. This highlights the role of non-radiative Auger decay, whose potential impact on fast timing applications I will discuss via a kinetic model.
This work received funding from Horizon Europe EIC Pathfinder program, project 101098649 - UNICORN. The authors also acknowledge DESY and the European Community support for measurements at HASYLAB (P66, Superlumi beamline) under Contract I-20220297 ECP6621.
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