Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 9, Pages 2725-2729Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201812865
Keywords
antimony; bismuth; lead-free; photoluminescence; zero-dimensional perovskites
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Funding
- National Natural Science Foundation of China [21833009, 21533010, 21703244, 21403226]
- National Key Research and Development Program of China [2016YFE0120900, 2017YFA0204800]
- DICP [ZZBS201703, DMTO201601]
- Science Challenging Program [JCKY2016212A501]
- National Superocomputing Center in Shenzhen
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Lead-free zero-dimensional (0D) organic-inorganic metal halide perovskites have recently attracted increasing attention for their excellent photoluminescence properties and chemical stability. Here, we report the synthesis and characterization of an air-stable 0D mixed metal halide perovskite (C8NH12)(4)Bi0.57Sb0.43Br7.H2O, in which individual [BiBr6](3-) and [SbBr6](3-) octahedral units are completely isolated and surrounded by the large organic cation C8H12N+. Upon photoexcitation, the bulk crystals exhibit ultra-broadband emission ranging from 400 to 850 nm, which originates from both free excitons and self-trapped excitons. This is the first example of 0D perovskites with broadband emission spanning the entire visible spectrum. In addition, (C8NH12)(4)Bi0.57Sb0.43Br7.H2O exhibits excellent humidity and light stability. These findings present a new direction towards the design of environmentally-friendly, high-performance 0D perovskite light emitters.
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