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Title: Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance
Authors: Chandran, Bevita K
Veldhuis, Sjoerd Antonius
Chin, Xin Yu
Bruno, Annalisa
Yantara, Natalia
Chen, Xiaodong
Mhaisalkar, Subodh
Keywords: Non-stoichiometry
Nanocrystals (NCs)
Issue Date: 2018
Source: Chandran, B. K., Veldhuis, S. A., Chin, X. Y., Bruno, A., Yantara, N., & Chen, X. (2018). Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance. Physical Chemistry Chemical Physics, 20, 5918-5925.
Series/Report no.: Physical Chemistry Chemical Physics
Abstract: High photoluminescence quantum yields and narrow emission wavelengths, combined with low temperature solution processing, make CH3NH3PbBr3 nanocrystals (NCs) favorable candidates for light-emitting applications. Herein, we describe the synthesis of CH3NH3PbBr3 NC inks by a convenient room-temperature ligand assisted reprecipitation protocol. We further investigate the effect of modulation of CH3NH3Br:PbBr2 ratio during NC synthesis on the optical properties, crystallinity, particle size distribution and film formation of the NC ink. Subsequently, we fabricate LEDs using these NCs as the emissive layer and the highest efficiency (1.75% external quantum efficiency) and brightness (>2700 cd m-2) is achieved for the 1.15:1 precursor ratio. It is inferred that NC surface properties and film coverage are more crucial than photoluminescence intensity to achieve high device efficiency. Moreover, by separating, the NC synthesis and thin film formation processes, we can exert more control during device fabrication, which makes it very promising for scale-up applications.
ISSN: 1463-9076
DOI: 10.1039/C7CP07827G
Rights: © 2018 The Author(s). This is the author created version of a work that has been peer reviewed and accepted for publication in Physical Chemistry Chemical Physics, published by Royal Society of Chemistry on behalf of The Author(s). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document.  The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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