Journal
NANO LETTERS
Volume 18, Issue 9, Pages 6076-6083Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03090
Keywords
MA(3)Bi(2)Br(9); perovskite variant; quantum dots; Cl-passivation; high PLQY
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Funding
- Major State Basic Research Development Program of China [2016YFB0700702]
- National Natural Science Foundation of China [5171101030, 61725401, 51702107]
- Huazhong University of Science and Technology (HUST) Key Innovation Team for Interdisciplinary Promotion [2016JCTD111]
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-09ER46664]
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Metal halide perovskite quantum dots (QDs) recently have attracted great research attentions. However, blue-emitting perovskite QDs generally suffer from low photoluminescence quantum yield (PLQY) because of easily formed defects and insufficient surface passivation. Replacement of lead with low toxicity elements is also preferred toward potential commercial applications. Here, we apply Cl-passivation to boost the PLQY of MA(3)Bi(2)Br(9) QDs to 54.1% at the wavelength of 422 nm, a new PLQY record for blue emissive, lead-free perovskite QDs. Because of the incompatible crystal structures between MA(3)Bi(2)Br(9) and MA(3)Bi(2)Cl(9) and the careful kinetic control during the synthesis, Cl- anions are engineered to mainly locate on the surface of QDs acting as passivating ligands, which effectively suppress surface defects and enhance the PLQY. Our results highlight the potential of MA(3)Bi(2)Br(9) QDs for applications of phosphors, scintillators, and light-emitting diodes.
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