Boosting Tunable Blue Luminescence of Halide Perovskite Nanoplatelets through Postsynthetic Surface Trap Repair.
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Authors
Tong, Yu
Gramlich, Moritz
Lai, May Ling
Döblinger, Markus
Feldmann, Jochen
Publication Date
2018-08-08Journal Title
Nano Lett
ISSN
1530-6984
Publisher
American Chemical Society (ACS)
Volume
18
Issue
8
Pages
5231-5238
Language
eng
Type
Article
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Bohn, B. J., Tong, Y., Gramlich, M., Lai, M. L., Döblinger, M., Wang, K., Hoye, R. L., et al. (2018). Boosting Tunable Blue Luminescence of Halide Perovskite Nanoplatelets through Postsynthetic Surface Trap Repair.. Nano Lett, 18 (8), 5231-5238. https://doi.org/10.1021/acs.nanolett.8b02190
Abstract
The easily tunable emission of halide perovskite nanocrystals throughout the visible spectrum makes them an extremely promising material for light-emitting applications. Whereas high quantum yields and long-term colloidal stability have already been achieved for nanocrystals emitting in the red and green spectral range, the blue region currently lags behind with low quantum yields, broad emission profiles, and insufficient colloidal stability. In this work, we present a facile synthetic approach for obtaining two-dimensional CsPbBr3 nanoplatelets with monolayer-precise control over their thickness, resulting in sharp photoluminescence and electroluminescence peaks with a tunable emission wavelength between 432 and 497 nm due to quantum confinement. Subsequent addition of a PbBr2-ligand solution repairs surface defects likely stemming from bromide and lead vacancies in a subensemble of weakly emissive nanoplatelets. The overall photoluminescence quantum yield of the blue-emissive colloidal dispersions is consequently enhanced up to a value of 73 ± 2%. Transient optical spectroscopy measurements focusing on the excitonic resonances further confirm the proposed repair process. Additionally, the high stability of these nanoplatelets in films and to prolonged ultraviolet light exposure is shown.
Sponsorship
Magdalene College, Cambridge
Funder references
Royal Society (UF150033)
European Research Council (756962)
Identifiers
External DOI: https://doi.org/10.1021/acs.nanolett.8b02190
This record's URL: https://www.repository.cam.ac.uk/handle/1810/279849
Rights
Attribution 4.0 International (CC BY 4.0)
Licence URL: https://creativecommons.org/licenses/by/4.0/
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