The DOI matches its Crossref record; 39 of the 39 references it cites were found in a registry or an index.
Potassium Bromide Surface Passivation on CsPbI3-xBrx Nanocrystals for Efficient and Stable Pure Red Perovskite Light-Emitting Diodes
Abstract
All-inorganic lead halide perovskite nanocrystals (NCs) are potential candidates for fabricating high-performance light-emitting diodes (LEDs) owing to their precisely tunable bandgaps, high photoluminescence (PL) efficiency, and excellent color purities. However, the performance of pure red (630–640 nm) all-inorganic perovskite LEDs is still limited by the halide segregation-induced instability of the electroluminescence (EL) of mixed halide CsPbI 3- x Br x NCs. Herein, we report an effective approach to improving the EL stability of pure red all-inorganic CsPbI 3- x Br x NC-based LEDs via the passivation of potassium bromide on NCs. By adding potassium oleate to the reaction system, we obtained potassium bromide surface-passivated (KBr-passivated) CsPbI 3- x Br x NCs with pure red PL emission and a photoluminescence quantum yield (PLQY) exceeding 90%. We determine that most potassium ions present on the surface of NCs bind with bromide ions and thus demonstrate that potassium bromide surface passivation of NCs can both improve the PL stability and inhibit the halide segregation of NCs. Using KBr-passivated CsPbI 3- x Br x NCs as an emitting layer, we fabricated stable and pure red perovskite LEDs with emission at 637 nm, showing a maximum brightness of 2671 cd m –2, maximum external quantum efficiency of 3.55%, and good EL stability. The proposed KBr-passivated NC strategy will open a new avenue for fabricating efficient, stable, and tunable pure color perovskite NC LEDs.
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Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per cent
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Genesis, challenges and opportunities for colloidal lead halide perovskite nanocrystals
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Maximizing and stabilizing luminescence from halide perovskites with potassium passivation
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Colloidal-quantum-dot photovoltaics using atomic-ligand passivation
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Efficient perovskite light-emitting diodes featuring nanometre-sized crystallites
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Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles
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Cited by
Ye, J., Byranvand, M. M., Martínez, C. O., Hoye, R. L. Z., Saliba, M., & Polavarapu, L. (2021) · Angewandte Chemie International Edition · doi:10.1002/anie.202102360 · Cited by 389
Metadata
- Authors
- Yang, J.-N., Song, Y., Yao, J.-S., Wang, K.-H., Wang, J.-J., Zhu, B.-S., Yao, M.-M., Rahman, S. U., Lan, Y.-F., Fan, F.-J., & Yao, H.-B.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-01-06
- Volume
- 142
- Issue
- 6
- Pages
- 2956-2967
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W3000217428
- Cited by
- 361
- References
- 39
- FWCI
- 18.82
- Type
- journal article
- Language
- en
- Open access
- closed
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- Yang, J.-N., Song, Y., Yao, J.-S., Wang, K.-H., Wang, J.-J., Zhu, B.-S., Yao, M.-M., Rahman, S. U., Lan, Y.-F., Fan, F.-J., & Yao, H.-B. (2020). Potassium Bromide Surface Passivation on CsPbI3-xBrx Nanocrystals for Efficient and Stable Pure Red Perovskite Light-Emitting Diodes. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.9b11719
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