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Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals.
Wang, Shixun; Shen, Xinyu; Zhang, Yu; Zhuang, Xingwei; Xue, Dingke; Zhang, Xiangtong; Wu, Jinlei; Zhu, Jinyang; Shi, Zhifeng; Kershaw, Stephen V; Yu, William W; Rogach, Andrey L.
Affiliation
  • Wang S; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Shen X; Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong S.A.R., China.
  • Zhang Y; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Zhuang X; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Xue D; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Zhang X; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Wu J; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Zhu J; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Shi Z; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
  • Kershaw SV; Department of Physics and Engineering, Zhengzhou University, Zhengzhou, 450052, China.
  • Yu WW; Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong S.A.R., China.
  • Rogach AL; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China.
Small ; 15(34): e1901828, 2019 Aug.
Article in En | MEDLINE | ID: mdl-31276320
ABSTRACT
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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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Small Journal subject: ENGENHARIA BIOMEDICA Year: 2019 Document type: Article Affiliation country: China
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Small Journal subject: ENGENHARIA BIOMEDICA Year: 2019 Document type: Article Affiliation country: China