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Nano Research 2019, 12(6): 1461-1465 https://doi.org/10.1007/s12274-019-2407-7
Research Article | Issue | Published: 29 May 2019

Stabilizing perovskite nanocrystals by controlling protective surface ligands density

Show Author's Information Weilin Zheng1,  Zhichun Li1,  Congyang Zhang1,  Bo Wang1,  Qinggang Zhang1,  Qun Wan1,  Long Kong1( ),  Liang Li1,2( )
School of Environmental Science and Engineering,Shanghai Jiao Tong University, 800 Dongchuan Road,Shanghai,200240,China;
Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China;
Keywords:
perovskite nanocrystals, purification, ligand density, photostability, encapsulation strategy
Topics:
Bromine compoundsLead compoundsLigands Light emitting diodes Liquid crystal displaysLiquid crystals Optical propertiesPerovskiteSemiconductor quantum dots
Cite this article:
Zheng W, Li Z, Zhang C, et al. Stabilizing perovskite nanocrystals by controlling protective surface ligands density. Nano Research, 2019, 12(6): 1461-1465. https://doi.org/10.1007/s12274-019-2407-7
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Abstract Full text About this article

After nanocrystals synthesis, the purification process with anti-solvents is an essential step to get clean nanocrystals, which could get rid of the by-products of the synthesis. It is generally recognized that this process could bring a positive effect for the afterward optoelectronic applications. Unfortunately, we found that the optical properties and photostability of perovskite CsPbBr3 nanocrystals were unavoidably deteriorated after they were washed with anti-solvents, and this deterioration is strongly related to the decreasing of surface ligands density. Therefore, in this paper, we tried to purposely not wash the CsPbBr3 nanocrystals solution after adding didodecyl dimethylammonium bromide (DDAB), and found the existing of DDAB in solution could result in a dramatically enhanced photostability. Inspired by these results, we proposed a new strategy to stabilize perovskite nanocrystals from the view of packaging process: adding protective ligands into the perovskite nanocrystals resin directly, then encapsulating them on blue light-emitting diodes (LED) chips. Surprisingly, stable LED devices (20 mA, 2.7V) were achieved by this way, which can keep 80% of the initial photoluminescence (PL) intensity for more than 50 h, while the devices with CsPbBr3 nanocrystals without adding protective ligands into resin dropped to 50% of their initial PL intensity within 6 h. This approach offers a new thought to stabilize perovskite nanocrystals as down-conversion phosphor in quantum dots liquid crystal display.


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About this article

Stabilizing perovskite nanocrystals by controlling protective surface ligands density

Show Author's information Weilin Zheng1, Zhichun Li1, Congyang Zhang1, Bo Wang1, Qinggang Zhang1, Qun Wan1, Long Kong1( ), Liang Li1,2( )
School of Environmental Science and Engineering,Shanghai Jiao Tong University, 800 Dongchuan Road,Shanghai,200240,China;
Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China;

Abstract

After nanocrystals synthesis, the purification process with anti-solvents is an essential step to get clean nanocrystals, which could get rid of the by-products of the synthesis. It is generally recognized that this process could bring a positive effect for the afterward optoelectronic applications. Unfortunately, we found that the optical properties and photostability of perovskite CsPbBr3 nanocrystals were unavoidably deteriorated after they were washed with anti-solvents, and this deterioration is strongly related to the decreasing of surface ligands density. Therefore, in this paper, we tried to purposely not wash the CsPbBr3 nanocrystals solution after adding didodecyl dimethylammonium bromide (DDAB), and found the existing of DDAB in solution could result in a dramatically enhanced photostability. Inspired by these results, we proposed a new strategy to stabilize perovskite nanocrystals from the view of packaging process: adding protective ligands into the perovskite nanocrystals resin directly, then encapsulating them on blue light-emitting diodes (LED) chips. Surprisingly, stable LED devices (20 mA, 2.7V) were achieved by this way, which can keep 80% of the initial photoluminescence (PL) intensity for more than 50 h, while the devices with CsPbBr3 nanocrystals without adding protective ligands into resin dropped to 50% of their initial PL intensity within 6 h. This approach offers a new thought to stabilize perovskite nanocrystals as down-conversion phosphor in quantum dots liquid crystal display.

Keywords: perovskite nanocrystals, purification, ligand density, photostability, encapsulation strategy

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Publication history
Copyright
Acknowledgements

Publication history

Received: 15 December 2018
Revised: 15 March 2019
Accepted: 08 April 2019
Published: 29 May 2019
Issue date: June 2019

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Acknowledgements

Acknowledgements

This work is supported by the Major National Science and Technology Special Project of Water Pollution Control and Remediation (No. 2017ZX07202), the National Natural Science Foundation of China (No. 21773155), and Shanghai Sailing Program (No. 19YF1422200).

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