4.6 Article

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

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

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资金

  1. National Nature Science Foundation of China (NSFC) [61965012, 31960136]
  2. Science and Technology Major Project of Yunnan Province [202202AG050004]
  3. Project of Yunnan Provincial Natural Science Foundation [202101AT070126]
  4. Yunnan Ten Thousand Talents Plan Young & Elite Talents Project [YNWR-QNBJ-2018-295]
  5. Sichuan Natural Science Foundation [2022JDJQ0030]
  6. Yunnan health training project of high-level talents [H-2017064]
  7. Yunnan Provincial Key Laboratory of Digital Orthopedics
  8. Yunnan Provincial Key Laboratory of Innovative application of characteristic Chinese Materia Medica
  9. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals [SKL-SPM-202012]

向作者/读者索取更多资源

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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