Journal
SMALL
Volume 15, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201901828
Keywords
blue-emitting materials; chelating action; mixed-halide perovskites; nanocrystals
Categories
Funding
- Jilin University [SXGJXX2017-3] Funding Source: Medline
- Natural Science Foundation of China [51772123, 61675086, 61722504] Funding Source: Medline
- Research Grant Council of Hong Kong S.A.R. [CityU11337616] Funding Source: Medline
- Croucher Foundation Funding Source: Medline
- Institutional Development [P20GM103424] Funding Source: Medline
- Croucher Foundation of Hong Kong Funding Source: Medline
- Research Grants Council, University Grants Committee [CityU11337616] Funding Source: Medline
- BORSF RCS Funding Source: Medline
- Province-University Co-Constructing Program of Jilin University [SXGJXX2017-3] Funding Source: Medline
- National Key Research and Development Program of China [2017YFB0403601] Funding Source: Medline
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All-inorganic cesium lead halide perovskite nanocrystals (NCs) have demonstrated excellent optical properties and an encouraging potential for optoelectronic applications; however, mixed-halide perovskites, especially CsPb(Cl/Br)(3) NCs, still show lower photoluminescence quantum yields (PL QY) than the corresponding single-halide materials. Herein, anhydrous oxalic acid is used to post-treat CsPb(Cl/Br)(3) NCs in order to initially remove surface defects and halide vacancies, and thus, to improve their PL QY from 11% to 89% for the emission of 451 nm. Furthermore, due to the continuous chelating reaction with the oxalate ion, chloride anions from the mixed-halide CsPb(Cl/Br)(3) perovskite NCs could be extracted, and green emitting CsPbBr3 NCs with PL QY of 85% at 511 nm emission are obtained. Besides being useful to improve the emission of CsPb(Cl/Br)(3) NCs, the oxalic acid treatment strategy introduced here provides a further tool to adjust the distribution of halide anions in mixed-halide perovskites without using any halide additives.
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