Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 34, Pages 11805-11821Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc02038a
Keywords
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Funding
- Nanyang Technological University (NTU), Singapore [M408070000]
- Singapore National Research Foundation, Prime Minister's Office, through the Competitive Research Program (CRP) [NRF-CRP14-2014-03]
- EPSRC through the EPSRC Centre for Doctoral Training in Molecular Analytical Science [EP/L015307/1]
- EPSRC [EP/M028186/1, EP/K024418/1]
- University of Warwick
- Birmingham Science City AM1 project - Advantage West Midlands (AWM)
- Birmingham Science City AM2 project - Advantage West Midlands (AWM)
- European Regional Development Fund (ERDF)
- EPSRC [EP/K024418/1, EP/M028186/1] Funding Source: UKRI
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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 Cs-x(MA(0.17)FA(0.83))(1-x)PbBr3(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(133)Cs 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 similar to 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 CsPbBr(3)nanocrystals (PL quantum yield similar to 50%; maximum EQE of 2.5% (7.2 cd A(-1))) fabricated under similar conditions.
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