Journal
ADVANCED SCIENCE
Volume 8, Issue 15, Pages -Publisher
WILEY
DOI: 10.1002/advs.202003728
Keywords
perovskites; quantum dots; scintillator; spatial resolution; X-ray imaging
Categories
Funding
- National Key Research and Development Program of China [2017YFA0207700]
- Outstanding Youth Fund of Zhejiang Natural Science Foundation of China [LR18F050001]
- Natural Science Foundation of China [61804134]
- National Nature Science Foundation of China (NSFC) [61965012]
- Yunnan Ten Thousand Talents Plan Young & Elite Talents Project [YNWR-QNBJ-2018-295, YNWR-QNBJ-2018-325]
- Excellent Youth Project of Yunnan Province Applied Basic Research Project [2019FI001]
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By in situ growing Eu-doped CsPbBr3 QDs inside a transparent amorphous matrix to form a glass-ceramic scintillator, the crystallization of perovskite QDs was optimized, reducing light scattering and achieving high-resolution X-ray imaging. This approach provides an effective platform for improving the performance of perovskite nanocrystal scintillators.
All-inorganic perovskite quantum dots (QDs) CsPbX3 (X = Cl, Br, and I) have recently emerged as a new promising class of X-ray scintillators. However, the instability of perovskite QDs and the strong optical scattering of the thick opaque QD scintillator film imped it to realize high-quality and robust X-ray image. Herein, the europium (Eu) doped CsPbBr3 QDs are in situ grown inside transparent amorphous matrix to form glass-ceramic (GC) scintillator with glass phase serving as both matrix and encapsulation for the perovskite QD scintillators. The small amount of Eu dopant optimizes the crystallization of CsPbBr3 QDs and makes their distribution more uniform in the glass matrix, which can significantly reduce the light scattering and also enhance the photoluminescence emission of CsPbBr3 QDs. As a result, a remarkably high spatial resolution of 15.0 lp mm(-1) is realized thanks to the reduced light scattering, which is so far a record resolution for perovskite scintillator based X-ray imaging, and the scintillation stability is also significantly improved compared to the bare perovskite QD scintillators. Those results provide an effective platform particularly for the emerging perovskite nanocrystal scintillators to reduce light scattering and improve radiation hardness.
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