Perovskite Cs3Cu2I5 thin film for high-resolution x-ray imaging

Pijush Bhattacharya; Bipin Singh; Jun Wang; Vivek V. Nagarkar

doi:10.1117/12.3006869

2 April 2024 Perovskite Cs₃Cu₂I₅ thin film for high-resolution x-ray imaging

Pijush Bhattacharya, Bipin Singh, Jun Wang, Vivek V. Nagarkar

Proceedings Volume 12930, Medical Imaging 2024: Clinical and Biomedical Imaging; 1293016 (2024) https://doi.org/10.1117/12.3006869
Event: SPIE Medical Imaging, 2024, San Diego, California, United States

Abstract

Here we report on the development of non-hygroscopic and lead-free perovskite Cs₃Cu₂I₅ (CCI) scintillator thin films for high-resolution x-ray imaging. The investigation is motivated by the bulk CCI crystal (density of 4.53 g/cm³), which has been reported to exhibit an ultrahigh light yield of 98,000 photons/MeV with reduced afterglow. Thin films were fabricated using two different techniques: hot-wall evaporation and casting of CCI – polymer composite materials. The films fabricated by both these techniques demonstrated high atmospheric stability. Independent of the fabrication method, the x-ray radioluminescence of undoped CCI films showed a bright blue emission at 450 nm from self-trapped exciton emission, whereas Tl-doped CCI films showed emission at 500 nm. Importantly, upon x-ray irradiation, a 100 μm thick CCI film exhibited a relatively high light output of 140% of Kodak Min-R 2000 film. The modulation transfer function (MTF(f)) was approximately 5 lp/mm at 10 % MTF for a 105 μm thick vapor deposited CCI film as well as 800 μm thick CCI – polymer composite film, measured using 70 kVp x-ray images of a tungsten slit phantom. The high air stability, nontoxicity, and high radioluminescence intensity with reduced afterglow, make CCI a potential replacement material for high-resolution, high-speed x-ray imaging.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Pijush Bhattacharya, Bipin Singh, Jun Wang, and Vivek V. Nagarkar "Perovskite Cs₃Cu₂I₅ thin film for high-resolution x-ray imaging", Proc. SPIE 12930, Medical Imaging 2024: Clinical and Biomedical Imaging, 1293016 (2 April 2024); https://doi.org/10.1117/12.3006869

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