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Investigating the structure-function relationship in triple cation perovskite nanocrystals for light-emitting diode applications
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Vashishtha, Parth, Veldhuis, Sjoerd A., Dintakurti, Sai S. H., Kelly, Nicole L., Griffith, Benjamin E., Brown, Alasdair A. M., Ansari, Mohammed S., Bruno, Annalisa, Mathews, Nripan, Fang, Yanan, White, Tim, Mhaisalkar, Subodh G. and Hanna, John V. (2020) Investigating the structure-function relationship in triple cation perovskite nanocrystals for light-emitting diode applications. Journal of Materials Chemistry C, 8 (34). pp. 11805-11821. doi:10.1039/d0tc02038a ISSN 2050-7526.
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Official URL: https://doi.org/10.1039/d0tc02038a
Abstract
Organic metal halide perovskite nanocrystals are promising candidates for light-emitting diodes due to their narrow emission bandwidth, high photoluminescence quantum yield (PLQY), and color tunability. Nevertheless, these systems suffer from thermal instability, phase impurities, and a sensitivity to processing techniques. This study reports the first synthesis of novel Cs-containing triple cation perovskite nanocrystals with nominal stoichiometry Csx(MA0.17FA0.83)1−xPbBr3 (x = 0–0.15). The effect of Cs+ cation incorporation is thoroughly investigated using diffraction, microscopy and solid state MAS NMR techniques. The solid state 133Cs MAS NMR results reveals the distribution of the Cs+ cations is highly concentration and particle size dependent, with maximized surface/subsurface Cs+ concentrations being achieved with the smaller 5 mol% Cs system. These characteristics directly correlate improved surface passivation and environmental stability of the triple cation system. These triple cation nanocrystals exhibit a maximum photoluminescence quantum yield of ∼93% which upon translation to nanocrystalline LED devices delivers a maximum EQE of 7.4% (30 cd A−1) corresponding to a power efficiency of 34.87 lm W−1. This performance represents a marked improvement compared to CsPbBr3 nanocrystals (PL quantum yield ∼50%; maximum EQE of 2.5% (7.2 cd A−1)) fabricated under similar conditions.
Item Type: | Journal Article | |||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Nanocrystals -- Synthesis, Light emitting diodes -- Materials, Perovskite materials | |||||||||||||||||||||||||||
Journal or Publication Title: | Journal of Materials Chemistry C | |||||||||||||||||||||||||||
Publisher: | Royal Society of Chemistry | |||||||||||||||||||||||||||
ISSN: | 2050-7526 | |||||||||||||||||||||||||||
Official Date: | 2020 | |||||||||||||||||||||||||||
Dates: |
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Volume: | 8 | |||||||||||||||||||||||||||
Number: | 34 | |||||||||||||||||||||||||||
Page Range: | pp. 11805-11821 | |||||||||||||||||||||||||||
DOI: | 10.1039/d0tc02038a | |||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||
Date of first compliant deposit: | 15 July 2022 | |||||||||||||||||||||||||||
Date of first compliant Open Access: | 15 July 2022 | |||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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