![]() ![]() This work deals with CsPbX 3 perovskites. Choices include organic compounds, such as C H 3 N H 3 + (MA +), C H ( N H 2 ) 2 + (FA +) and C ( N H 2 ) 3 + (GA +) and inorganic cations such as Cs +, K + and Rb +. Previous work has shown that the A site cation can be widely varied, affecting the stability and electrical conductivity of the perovskite. Additionally, the change in halide has effects on the scintillation decay time of the material as the band gap increases, allowing further customisation for the system. By matching the spectrum emission of the perovskite to an associated photosensor, the system can be optimised to increase the overall efficiency of the detector. By varying the relative amounts of Cl, Br and I the peak emission from lead halide perovskites can be varied from 400–700 nm by altering the semiconductor’s band gap. A benefit of the material is the tunable peak emission wavelength that the ratio of the anion site halide can bring. Pb 2+ is an ideal component for these materials as radiation detectors, as its high-Z number ensures a large X-ray cross section and quantum efficiency. Lead halide perovskites are a class of material following the structure of the ABX 3 perovskite, where the B-cation site is occupied by Pb 2+ and the X-anion site is a range of halides, e.g., Cl −, Br − and I −. The composites were also characterised in terms of the radioluminescent light yield and decay response, alongside their X-ray sensitivity, in which the PMMA-CsPbBr 3 composites again outperformed the materials containing Cl − anions. These perovskite nanocrystals were successfully loaded into PMMA, an inert plastic, at 2% mass weighting and the responses of these composites were compared to that of their colloidal dispersions. The effect of the varying the halide composition on the resulting peak emission and light yield is discussed, with the CsPbBr 3 materials displaying the greatest light yield. We present work on the development of mixed-halide perovskite (CsPbCl xBr (1− x)) nanocrystal scintillators for X-ray detection applications. 4Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Campus, Didcot, United Kingdom.3Advanced Technology Institute, University of Surrey, Guildford, United Kingdom.2Department of Chemistry, University of Surrey, Guildford, United Kingdom.1Department of Physics, University of Surrey, Guildford, United Kingdom.Joseph O’Neill 1* Isabel Braddock 1 Carol Crean 2 Joydip Ghosh 1 Mateus Masteghin 3 Sion Richards 4 Matthew Wilson 4 Paul Sellin 1 ![]()
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