Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance
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-temperatur...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/87194 http://hdl.handle.net/10220/44351 |
| _version_ | 1826128259358654464 |
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| author | Chandran, Bevita K Veldhuis, Sjoerd Antonius Chin, Xin Yu Bruno, Annalisa Yantara, Natalia Chen, Xiaodong Mhaisalkar, Subodh |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Chandran, Bevita K Veldhuis, Sjoerd Antonius Chin, Xin Yu Bruno, Annalisa Yantara, Natalia Chen, Xiaodong Mhaisalkar, Subodh |
| author_sort | Chandran, Bevita K |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T07:22:02Z |
| format | Journal Article |
| id | ntu-10356/87194 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:22:02Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/871942021-01-13T07:15:47Z Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance Chandran, Bevita K Veldhuis, Sjoerd Antonius Chin, Xin Yu Bruno, Annalisa Yantara, Natalia Chen, Xiaodong Mhaisalkar, Subodh School of Materials Science and Engineering School of Physical and Mathematical Sciences Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Research Techno Plaza Non-stoichiometry Nanocrystals (NCs) 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. NRF (Natl Research Foundation, S’pore) Accepted version 2018-01-26T03:03:16Z 2019-12-06T16:36:59Z 2018-01-26T03:03:16Z 2019-12-06T16:36:59Z 2018 2018 Journal Article 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. 1463-9076 https://hdl.handle.net/10356/87194 http://hdl.handle.net/10220/44351 10.1039/C7CP07827G 203234 en Physical Chemistry Chemical Physics © 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: [http://dx.doi.org/10.1039/C7CP07827G]. 16 p. application/pdf |
| spellingShingle | Non-stoichiometry Nanocrystals (NCs) Chandran, Bevita K Veldhuis, Sjoerd Antonius Chin, Xin Yu Bruno, Annalisa Yantara, Natalia Chen, Xiaodong Mhaisalkar, Subodh Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance |
| title | Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance |
| title_full | Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance |
| title_fullStr | Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance |
| title_full_unstemmed | Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance |
| title_short | Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance |
| title_sort | precursor non stoichiometry to enable improved ch3nh3pbbr3 nanocrystal led performance |
| topic | Non-stoichiometry Nanocrystals (NCs) |
| url | https://hdl.handle.net/10356/87194 http://hdl.handle.net/10220/44351 |
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