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Title: All‐Inorganic Bismuth‐Based Perovskite Quantum Dots with Bright Blue Photoluminescence and Excellent Stability

Journal Article · · Advanced Functional Materials
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  1. Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan Hubei 430074 China
  2. School of Material Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China
  3. Department of Chemistry University of Wisconsin–Madison 1101 University Avenue Madison WI 53706 USA

Abstract Lead halide perovskite quantum dots (QDs) possess color‐tunable and narrow‐band emissions and are very promising for lighting and display applications, but they suffer from lead toxicity and instability. Although lead‐free Bi‐based and Sn‐based perovskite QDs (CsSnX 3 , Cs 2 SnX 6 , and (CH 3 NH 3 ) 3 Bi 2 X 9 ) are reported, they all show low photoluminescence quantum yield (PLQY) and poor stability. Here, the synthesis of Cs 3 Bi 2 Br 9 perovskite QDs with high PLQY and excellent stability is reported. Via a green and facile process using ethanol as the antisolvent, as‐synthesized Cs 3 Bi 2 Br 9 QDs show a blue emission at 410 nm with a PLQY up to 19.4%. The whole series of Cs 3 Bi 2 X 9 (X = Cl, Br, and I) QDs by mixing precursors can cover the photoluminescence emission range from 393 to 545 nm. Furthermore, Cs 3 Bi 2 Br 9 QDs show excellent photostability and moisture stability due to the all‐inorganic nature and the surface passivation by BiOBr, which enables the one‐pot synthesis of Cs 3 Bi 2 Br 9 QD/silica composite. A lead‐free perovskite white light‐emitting diode is fabricated by simply combining the composite of Cs 3 Bi 2 Br 9 QD/silica with Y 3 Al 5 O 12 phosphor. As a new member of lead‐free perovskite QDs, Cs 3 Bi 2 Br 9 QDs open up a new route for the fabrication of optoelectronic devices due to their excellent stability and photophysical characteristics.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐FG02‐ 09ER46664
OSTI ID:
1410377
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 28 Journal Issue: 1; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 292 works
Citation information provided by
Web of Science

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