期刊
NANO LETTERS
卷 18, 期 8, 页码 5231-5238出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02190
关键词
CsPbBr3; perovskite nanocrystals; nanoplatelets; quantum confinement; exciton binding energy; defect passivation; blue light emitting diodes
类别
资金
- Bavarian State Ministry of Science, Research, and Arts
- European Research Council Horizon 2020 ERC [759744 - PINNACLE]
- China Scholarship Council
- European Union [691185]
- LMU Munich's Institutional Strategy LMU excellent within the framework of the German Excellence Initiative
- Magdalene College, Cambridge
- European Research Council (ERC) under the European Union [756962]
- Royal Society
- Tata Group [UF150033]
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 PbBrr-ligand solution repairs surface delects 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.
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