期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 10, 期 43, 页码 16294-16300出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tc03823d
关键词
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资金
- National Nature Science Foundation of China (NSFC) [61965012, 31960136]
- Science and Technology Major Project of Yunnan Province [202202AG050004]
- Project of Yunnan Provincial Natural Science Foundation [202101AT070126]
- Yunnan Ten Thousand Talents Plan Young & Elite Talents Project [YNWR-QNBJ-2018-295]
- Sichuan Natural Science Foundation [2022JDJQ0030]
- Yunnan health training project of high-level talents [H-2017064]
- Yunnan Provincial Key Laboratory of Digital Orthopedics
- Yunnan Provincial Key Laboratory of Innovative application of characteristic Chinese Materia Medica
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals [SKL-SPM-202012]
Lead-free metal halide perovskites are emerging candidates for white light emitting diodes and X-ray imaging. This study focuses on the synthesis of Cs2HfCl6: Te4+ crystals and explores their performance in advanced devices. The crystals exhibit specific emission wavelength, wide emission bandwidth, and efficient energy transfer process, enabling the manufacturing of high-performance white light emitting diodes and X-ray imaging with good characteristics.
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 (P-3(1) -> S-1(0)) 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.
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