Issue 43, 2022

High quality lead-free perovskites toward white light emitting diodes and X-ray imaging

Abstract

Lead-free metal halide perovskites have become emerging candidates for white light emitting diodes and X-ray imaging, and exploration of the corresponding down-conversion phosphors and scintillators based on perovskite structures with a high-performance for advanced devices is ongoing. Here, we synthesized Cs2HfCl6: Te4+ crystals with a yellow emission at 557 nm and a wide full width at half maximum around 104 nm, which is attributed to the transition from the triplet state to the ground state (3P11S0) of Te4+ ions. Moreover, the energy transfer process from the self-trapped exciton of Cs2HfCl6 to Te4+ ions is demonstrated. Accordingly, the white light emitting diodes show a color rendering index of 61.8, which was manufactured by employing the Cs2HfCl6:3% Te4+ crystals with a photoluminescence quantum yield of 74.2%. Furthermore, the Cs2HfCl6: Te4+ crystals exhibit a fascinating steady-state X-ray light yield reaching 76,194 photons MeV−1, a low detection limit of 36.2 nGy s−1 and a high spatial resolution of 11 lp mm−1. Hence, this study offers new insight for the development of lead-free metal halide perovskites and promotes their versatile application in white light emitting diodes and X-ray imaging.

Graphical abstract: High quality lead-free perovskites toward white light emitting diodes and X-ray imaging

Supplementary files

Article information

Article type
Paper
Submitted
10 sep 2022
Accepted
10 okt 2022
First published
21 okt 2022

J. Mater. Chem. C, 2022,10, 16294-16300

High quality lead-free perovskites toward white light emitting diodes and X-ray imaging

S. Yan, S. Liu, Z. Teng, H. Li, W. Chen, W. Zhou, J. Qiu, X. Yu, S. Wang and X. Xu, J. Mater. Chem. C, 2022, 10, 16294 DOI: 10.1039/D2TC03823D

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