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Ultrastable Zero-Dimensional Cs4PbBr6 Perovskite Quantum Dot Glass

The instability of all-inorganic perovskites and poor understanding of the photoluminescence mechanisms have hindered their practical applications. While a large body of work on 3-D perovskite phases is available in the literature, the promising zero-dimensional (0-D) phase perovskite materials are...

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Bibliographic Details
Published in:ACS sustainable chemistry & engineering 2020-07, Vol.8 (29), p.10646-10652
Main Authors: Li, Shasha, Liu, Guanchen, Liu, Qun, Nie, Lanjian, Yao, Guanpeng, Zeng, Fanming, He, Yaoting, Xiang, Weidong
Format: Article
Language:English
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Summary:The instability of all-inorganic perovskites and poor understanding of the photoluminescence mechanisms have hindered their practical applications. While a large body of work on 3-D perovskite phases is available in the literature, the promising zero-dimensional (0-D) phase perovskite materials are still poorly understood. Herein, we report a new synthesis method for the production of 0-D Cs4PbBr6 perovskite quantum dots (QDs) in glass using a combination of Cs2CO3 concentration and heat-treatment temperature optimization. The differences in structure, morphology, and photoluminescence (PL) between the 0-D Cs4PbBr6 QDs and the 3-D CsPbBr3 QDs in glass were studied in detail. Cs4PbBr6 QD glass with high transmittance displayed a blue-shift PL emission centered at 503 nm, a narrow full width at half-maximum (fwhm, ∼20 nm), a high photoluminescence quantum yield (PLQY, ∼22%), and excellent long-term stability, thereby, advancing the study of these materials. It was demonstrated that Cs4PbBr6 displayed unique luminescent properties in correlation with the intrinsic defect states in the mid-band gap.
ISSN:2168-0485
2168-0485
DOI:10.1021/acssuschemeng.0c03914