All‐Inorganic Bismuth‐Based Perovskite Quantum Dots with Bright Blue Photoluminescence and Excellent Stability. (27th November 2017)

• Record Type: Journal Article
• Authors: Leng, Meiying; Yang, Ying; Zeng, Kai; Chen, Zhengwu; Tan, Zhifang; Li, Shunran; Li, Jinghui; Xu, Bing; Li, Dengbing; Hautzinger, Matthew P.; Fu, Yongping; Zhai, Tianyou; Xu, Ling; Niu, Guangda; Jin, Song; Tang, Jiang
• Is Part Of: Advanced functional materials. Volume 28:Number 1(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-11-27
• Subjects: Bi‐based perovskites -- Cs3Bi2X9 -- photoluminescence -- quantum dots -- stability; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201704446
• Languages: English
• ISSNs: 1616-301X

Abstract

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 (CsSnX3, Cs2 SnX6, and (CH3 NH3 )3 Bi2 X9 ) are reported, they all show low photoluminescence quantum yield (PLQY) and poor stability. Here, the synthesis of Cs3 Bi2 Br9 perovskite QDs with high PLQY and excellent stability is reported. Via a green and facile process using ethanol as the antisolvent, as‐synthesized Cs3 Bi2 Br9 QDs show a blue emission at 410 nm with a PLQY up to 19.4%. The whole series of Cs3 Bi2 X9 (X = Cl, Br, and I) QDs by mixing precursors can cover the photoluminescence emission range from 393 to 545 nm. Furthermore, Cs3 Bi2 Br9 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 Cs3 Bi2 Br9 QD/silica composite. A lead‐free perovskite white light‐emitting diode is fabricated by simply combining the composite of Cs3 Bi2 Br9 QD/silica with Y3 Al5 O12 phosphor. As a new member of lead‐free perovskite QDs, Cs3 Bi2 Br9 QDs open up a new route for the fabrication of optoelectronic devices due to their excellent stability and photophysical characteristics. Abstract : A simple and environmentally benign synthetic method, combined with good crystallization, high photoluminescence quantum yields in the blue wavelength region, and excellent moisture stability, makes Cs3 Bi2 Br9 quantum dots (QDs) very competitive for various optoelectronic applications. Finally, the first lead‐free perovskite white light‐emitting diode is successfully made by simply combining the composite of Cs3 Bi2 Br9 QD/silica with Y3 Al5 O12 phosphor.