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Room-Temperature Doping of CsPbBr3 Nanocrystals with Aluminum

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    Physical Insights into Materials and Molecular Properties

    Room-Temperature Doping of CsPbBr3 Nanocrystals with Aluminum
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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2022, 13, 20, 4495–4500
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    https://doi.org/10.1021/acs.jpclett.2c01021
    Published May 16, 2022
    Copyright © 2022 American Chemical Society
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    Abstract

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    B-site doping is an emerging strategy for tuning the emission wavelength of cesium lead halide ABX3 nanocrystals. We present a simple method for the postsynthetic doping of CsPbBr3 nanocrystals with aluminum at room temperature by exposing them to a solution of AlBr3 in dibromomethane. Despite the much smaller ionic radius of Al3+ compared to that of Pb2+, nominal doping levels in a range from 8.1% to 24.3% were obtained when increasing the Al/Pb feed ratio from 1 to 4.5. Al3+ introduction leads to a hypsochromic shift of the photoluminescence (PL) emission of the CsPbBr3 nanocrystals. The PL peak position is highly stable over at least 6 months and tunable in a range of 510 to 480 nm by increasing the doping level. Structural analyses revealed a linear correlation between the PL energy and the lattice parameter with a slope of −1.96 eV/Å.

    Copyright © 2022 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpclett.2c01021.

    • Additional experimental details concerning NC synthesis and characterization, TEM images of samples with different doping levels, the relationship between the input and measured Al/Pb ratio, zoomed-in XRD patterns of the doped and undoped NCs, Pb 4f and Br 3d XPS spectra, and XRD data obtained in capillary configuration (PDF)

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    This article is cited by 10 publications.

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    2. Shovon Chatterjee, Subarna Biswas, Smruti Sourav, Jyotisman Rath, Syed Akhil, Nimai Mishra. Strategies To Achieve Long-Term Stability in Lead Halide Perovskite Nanocrystals and Its Optoelectronic Applications. The Journal of Physical Chemistry Letters 2024, 15 (40) , 10118-10137. https://doi.org/10.1021/acs.jpclett.4c02240
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    8. Yujiao Sun, Yongchao Cheng, Zijiang Yang, Ce Bian, Sheng Huang, Xiuquan Gu. Enhanced Performance of CsPbBr 3 Nanocrystals via Dual Passivation. Advanced Materials Interfaces 2024, 11 (32) https://doi.org/10.1002/admi.202400401
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    10. Hao Yu, Bin Yan, Yonghui Song, Qiqi Zhao, Meng Gao, Liangmin Ning, Wei Chen, Min Fu, Kunhua Wang, Jianxu Ding. Aluminium acetylacetonate ligand passivation for CsPbBr 3 nanocrystals with improved stability and photoluminescence. Journal of Materials Chemistry C 2023, 11 (32) , 10957-10964. https://doi.org/10.1039/D3TC01455J
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    The Journal of Physical Chemistry Letters

    Cite this: J. Phys. Chem. Lett. 2022, 13, 20, 4495–4500
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpclett.2c01021
    Published May 16, 2022
    Copyright © 2022 American Chemical Society
    Request reuse permissions

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