Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals

Shixun Wang; Xinyu Shen; Yu Zhang; Xingwei Zhuang; Dingke Xue; Xiangtong Zhang; Jinlei Wu; Jinyang Zhu; Zhifeng Shi; Stephen V. Kershaw; William W. Yu; Andrey L. Rogach

doi:10.1002/smll.201901828

Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals

Shixun Wang, Xinyu Shen, Yu Zhang^*, Xingwei Zhuang, Dingke Xue, Xiangtong Zhang, Jinlei Wu, Jinyang Zhu, Zhifeng Shi, Stephen V. Kershaw, William W. Yu, Andrey L. Rogach^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

30 Citations (Scopus)

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.

Original language	English
Article number	1901828
Journal	Small
Volume	15
Issue number	34
Online published	5 Jul 2019
DOIs	https://doi.org/10.1002/smll.201901828
Publication status	Published - 23 Aug 2019

Research Keywords

blue-emitting materials
chelating action
mixed-halide perovskites
nanocrystals

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RGC-funded

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10.1002/smll.201901828

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@article{9031dad95edf427a828a48391c5f033d,

title = "Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals",

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.",

keywords = "blue-emitting materials, chelating action, mixed-halide perovskites, nanocrystals",

author = "Shixun Wang and Xinyu Shen and Yu Zhang and Xingwei Zhuang and Dingke Xue and Xiangtong Zhang and Jinlei Wu and Jinyang Zhu and Zhifeng Shi and Kershaw, {Stephen V.} and Yu, {William W.} and Rogach, {Andrey L.}",

year = "2019",

month = aug,

day = "23",

doi = "10.1002/smll.201901828",

language = "English",

volume = "15",

journal = "Small",

issn = "1613-6810",

publisher = "Wiley-VCH Verlag GmbH",

number = "34",

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TY - JOUR

T1 - Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals

AU - Wang, Shixun

AU - Shen, Xinyu

AU - Zhang, Yu

AU - Zhuang, Xingwei

AU - Xue, Dingke

AU - Zhang, Xiangtong

AU - Wu, Jinlei

AU - Zhu, Jinyang

AU - Shi, Zhifeng

AU - Kershaw, Stephen V.

AU - Yu, William W.

AU - Rogach, Andrey L.

PY - 2019/8/23

Y1 - 2019/8/23

N2 - 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.

AB - 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.

KW - blue-emitting materials

KW - chelating action

KW - mixed-halide perovskites

KW - nanocrystals

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U2 - 10.1002/smll.201901828

DO - 10.1002/smll.201901828

M3 - RGC 21 - Publication in refereed journal

SN - 1613-6810

VL - 15

JO - Small

JF - Small

IS - 34

M1 - 1901828

ER -

Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals

Abstract

Research Keywords

RGC Funding Information

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GRF: Development of Robust Stable Perovskite Quantum Dots with Optimal Optical Performance for Light Emitting Device Applications

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Oxalic Acid Enabled Emission Enhancement and Continuous Extraction of Chloride from Cesium Lead Chloride/Bromide Perovskite Nanocrystals

Abstract

Research Keywords

RGC Funding Information

Access Output

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Permanent Link

Other Files and Links

Fingerprint

Projects

GRF: Development of Robust Stable Perovskite Quantum Dots with Optimal Optical Performance for Light Emitting Device Applications

Cite this