Please use this identifier to cite or link to this item:
https://hdl.handle.net/10356/138189
Title: | Self-assembly of a robust hydrogen-bonded octylphosphonate network on cesium lead bromide perovskite nanocrystals for light-emitting diodes | Authors: | Brown, Alasdair Angus Macintyre Hooper, Thomas J. N. Veldhuis, Sjoerd Antonius Chin, Xin Yu Bruno, Annalisa Vashishtha, Parth Tey, Ju Nie Jiang, Liudi Damodaran, Bahulayan Pu, Suan Hui Subodh Gautam Mhaisalkar Mathews, Nripan |
Keywords: | Engineering::Materials | Issue Date: | 2019 | Source: | Brown, A. A. M., Hooper, T. J. N., Veldhuis, S. A., Chin, X. Y., Bruno, A., Vashishtha, P., . . . Mathews, N. (2019). Self-assembly of a robust hydrogen-bonded octylphosphonate network on cesium lead bromide perovskite nanocrystals for light-emitting diodes. Nanoscale, 11(25), 12370-12380. doi:10.1039/C9NR02566A | Journal: | Nanoscale | Abstract: | We report the self-assembly of an extensive inter-ligand hydrogen-bonding network of octylphosphonates on the surface of cesium lead bromide nanocrystals (CsPbBr3 NCs). The post-synthetic addition of octylphosphonic acid to oleic acid/oleylamine-capped CsPbBr3 NCs promoted the attachment of octylphosphonate to the NC surface, while the remaining oleylammonium ligands maintained the high dispersability of the NCs in non-polar solvent. Through powerful 2D solid-state 31P–1H NMR, we demonstrated that an ethyl acetate/acetonitrile purification regime was crucial for initiating the self-assembly of extensive octylphosphonate chains. Octylphosphonate ligands were found to preferentially bind in a monodentate mode through P–O−, leaving polar P[double bond, length as m-dash]O and P–OH groups free to form inter-ligand hydrogen bonds. The octylphosphonate ligand network strongly passivated the nanocrystal surface, yielding a fully-purified CsPbBr3 NC ink with PLQY of 62%, over 3 times higher than untreated NCs. We translated this to LED devices, achieving maximum external quantum efficiency and luminance of 7.74% and 1022 cd m−2 with OPA treatment, as opposed to 3.59% and 229 cd m−2 for untreated CsPbBr3 NCs. This represents one of the highest efficiency LEDs obtained for all-inorganic CsPbBr3 NCs, accomplished through simple, effective passivation and purification processes. The robust binding of octylphosphonates to the perovskite lattice, and specifically their ability to interlink through hydrogen bonding, offers a promising passivation approach which could potentially be beneficial across a breadth of halide perovskite optoelectronic applications. | URI: | https://hdl.handle.net/10356/138189 | ISSN: | 2040-3364 | DOI: | 10.1039/C9NR02566A | DOI (Related Dataset): | https://doi.org/10.21979/N9/GAPRHL | Rights: | © 2019 The Royal Society of Chemistry. All rights reserved. This paper was published in Nanoscale and is made available with permission of The Royal Society of Chemistry. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | ERI@N Journal Articles MSE Journal Articles SIMTech Journal Articles |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Self assembly of a robust hydrogen-bonded octylphosphonate network on cesium lead bromide perovskite nanocrystals for light emitting diodes REVISED.pdf | 2.45 MB | Adobe PDF | ![]() View/Open |
SCOPUSTM
Citations
10
23
Updated on Apr 28, 2021
PublonsTM
Citations
10
22
Updated on Apr 25, 2021
Page view(s)
217
Updated on Jun 26, 2022
Download(s) 50
47
Updated on Jun 26, 2022
Google ScholarTM
Check
Altmetric
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.