• Login
    View Item 
    •   Home
    • Research
    • Articles
    • View Item
    •   Home
    • Research
    • Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of KAUSTCommunitiesIssue DateSubmit DateThis CollectionIssue DateSubmit Date

    My Account

    Login

    Quick Links

    Open Access PolicyORCID LibguidePlumX LibguideSubmit an Item

    Statistics

    Display statistics

    Chlorine Vacancy Passivation in Mixed-Halide Perovskite Quantum Dots by Organic Pseudohalides Enables Efficient Rec. 2020 Blue Light-Emitting Diodes

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Manuscript.pdf
    Size:
    1.887Mb
    Format:
    PDF
    Description:
    Accepted Manuscript
    Download
    Type
    Article
    Authors
    Zheng, Xiaopeng
    Yuan, Shuai
    Liu, Jiakai cc
    Yin, Jun cc
    Yuan, Fanglong
    Shen, Wan-Shan
    Yao, Kexin
    Wei, Mingyang
    Zhou, Chun
    Song, Kepeng
    Zhang, Bin-Bin
    Lin, Yuanbao
    Hedhili, Mohamed N. cc
    Wehbe, Nimer
    Han, Yu cc
    Sun, Hong-Tao
    Lu, Zheng-Hong
    Anthopoulos, Thomas D. cc
    Mohammed, Omar F. cc
    Sargent, Edward H.
    Liao, Liang-Sheng
    Bakr, Osman cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Chemical Science Program
    Functional Nanomaterials Lab (FuNL)
    KAUST Catalysis Center (KCC)
    KAUST Solar Center (KSC)
    Material Science and Engineering
    Material Science and Engineering Program
    Nanostructured Functional Materials (NFM) laboratory
    Physical Science and Engineering (PSE) Division
    Surface Science
    Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
    Date
    2020-02-11
    Online Publication Date
    2020-02-11
    Print Publication Date
    2020-03-13
    Embargo End Date
    2021-02-11
    Submitted Date
    2020-01-08
    Permanent link to this record
    http://hdl.handle.net/10754/661562
    
    Metadata
    Show full item record
    Abstract
    Blue-emitting perovskites can be easily attained by precisely tuning the halide ratio of mixed halide (Br/Cl) perovskites (MHPs). However, the adjustable halide ratio hinders the passivation of Cl vacancies, the main source of trap states leading to inferior performance of blue MHP lightemitting diodes (LEDs). Here, we report a strategy for passivating Cl vacancies in MHP quantum dots (QDs) using nonpolar solvent-soluble organic pseudohalide [n-dodecylammonium thiocyanate (DAT)], enabling blue MHP LEDs with greatly enhanced efficiency. Density functional theory calculations reveal that the thiocyanate (SCN−) groups fill in the Cl vacancies and remove electron traps within the bandgap. DAT-treated CsPb(BrxCl1−x)3 QDs exhibit near unity (∼100%) photoluminescence quantum yields, and their blue (∼470 nm) LEDs are spectrally stable with an external quantum efficiency of 6.3%, a record for perovskite LEDs emitting in the range of 460−480 nm relevant to Rec. 2020 display standards, and a halflifetime of ∼99 s.
    Citation
    Zheng, X., Yuan, S., Liu, J., Yin, J., Yuan, F., Shen, W.-S., … Bakr, O. M. (2020). Chlorine Vacancy Passivation in Mixed-Halide Perovskite Quantum Dots by Organic Pseudohalides Enables Efficient Rec. 2020 Blue Light-Emitting Diodes. ACS Energy Letters. doi:10.1021/acsenergylett.0c00057
    Sponsors
    The authors acknowledge the funding support from KAUST, the National Natural Science Foundation of China (Grants 61575136 and 51773141), and the Collaborative Innovation Centre of Suzhou Nano Science and Technology (Nano-CIC) by the Priority Academic Program. E.H.S. and all co-authors from the Department of Electrical and Computer Engineering at the University of Toronto acknowledge the financial support from the Ontario Research Fund−Research Excellence Program and from the Natural Sciences and Engineering Research Council of Canada (NSERC).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Energy Letters
    DOI
    10.1021/acsenergylett.0c00057
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsenergylett.0c00057
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsenergylett.0c00057
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC); KAUST Solar Center (KSC)

    entitlement

     
    DSpace software copyright © 2002-2021  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service hosted by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items. For anonymous users the allowed maximum amount is 50 search results.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.