Hybridisation of perovskite nanocrystals with organic molecules for highly efficient liquid scintillators

Sangeun Cho, Sungwoo Kim, Jongmin Kim, Yongcheol Jo, Ilhwan Ryu, Seongsu Hong, Jae Joon Lee, Seung Nam Cha, Eun Bi Nam, Sang Uck Lee, Sam Kyu Noh, Hyungsang Kim, Jungwon Kwak, Hyunsik Im

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

Compared with solid scintillators, liquid scintillators have limited capability in dosimetry and radiography due to their relatively low light yields. Here, we report a new generation of highly efficient and low-cost liquid scintillators constructed by surface hybridisation of colloidal metal halide perovskite CsPbA3 (A: Cl, Br, I) nanocrystals (NCs) with organic molecules (2,5-diphenyloxazole). The hybrid liquid scintillators, compared to state-of-the-art CsI and Gd2O2S, demonstrate markedly highly competitive radioluminescence quantum yields under X-ray irradiation typically employed in diagnosis and treatment. Experimental and theoretical analyses suggest that the enhanced quantum yield is associated with X-ray photon-induced charge transfer from the organic molecules to the NCs. High-resolution X-ray imaging is demonstrated using a hybrid CsPbBr3 NC-based liquid scintillator. The novel X-ray scintillation mechanism in our hybrid scintillators could be extended to enhance the quantum yield of various types of scintillators, enabling low-dose radiation detection in various fields, including fundamental science and imaging.

Original languageEnglish
Article number156
JournalLight: Science and Applications
Volume9
Issue number1
DOIs
StatePublished - 1 Dec 2020

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