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    All-inorganic quantum dot LEDs based on phase-stabilized α-CsPbI3 perovskite

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    All inorganic.pdf
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    Description:
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    Type
    Article
    Authors
    Wang, Ya-Kun
    Yuan, Fanglong
    Dong, Yitong
    Li, Jiao-Yang
    Johnston, Andrew
    Chen, Bin
    Saidaminov, Makhsud I.
    Zhou, Chun
    Zheng, Xiaopeng
    Hou, Yi
    Bertens, Koen
    Ebe, Hinako
    Ma, Dongxin
    Deng, Zhengtao
    Yuan, Shuai
    Chen, Rui
    Sagar, Laxmi Kishore
    Liu, Jiakai cc
    Fan, James
    Li, Peicheng
    Li, Xiyan
    Gao, Yuan
    Fung, Man-Keung
    Lu, Zheng-Hong
    Bakr, Osman cc
    Liao, Liang-Sheng
    Sargent, Edward Hartley
    KAUST Department
    Functional Nanomaterials Lab (FuNL)
    KAUST Catalysis Center (KCC)
    Material Science and Engineering
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2021-06-14
    Online Publication Date
    2021-06-14
    Print Publication Date
    2021-07-12
    Embargo End Date
    2022-05-12
    Submitted Date
    2021-04-08
    Permanent link to this record
    http://hdl.handle.net/10754/669504
    
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    Abstract
    The all-inorganic nature of CsPbI 3 perovskites offers an avenue to enhance stability in perovskite devices. Concerted research efforts have led to improved stability of the black phase in CsPbI 3 films; however, these strategies – including strain and doping – are based on organic-ligand-capped perovskites, which prevent perovskites from forming the close-packed QD solids necessary to achieve high charge transport and thermal transport. Here we develop an inorganic ligand exchange that leads to CsPbI 3 QD films that unite superior phase stability with increased thermal transport. We demonstrate that the atomic ligand exchanged QD films, once mechanically coupled, exhibit improved phase stability, and we link this to distributing strain across the film. Further, operando measurements of the temperature of LEDs indicate that KI-exchanged QD films exhibit increased thermal transport compared to controls that rely on organic ligands. The LEDs exhibit a maximum EQE of 23% with EL emission centered at 640 nm (FWHM of ~31 nm). These red LEDs provide an operating half lifetime of 10 hours (luminance of 200 cd/m 2 ), an operating stability that is 6x higher than that of control devices.
    Citation
    Wang, Y.-K., Yuan, F., Dong, Y., Li, J.-Y., Johnston, A., Chen, B., … Sargent, E. H. (2021). All-inorganic quantum dot LEDs based on phase-stabilized α-CsPbI3 perovskite. Angewandte Chemie. doi:10.1002/ange.202104812
    Sponsors
    This work was supported by the Ontario Research Fund Research-Excellence Program and the Natural Sciences and Engineering Research Council of Canada (NSERC grant number 216956-12). M.I.S. acknowledges the support of Banting Postdoctoral Fellowship Program administered by the Government of Canada. We acknowledge financial support from Natural Science Foundation of China (Nos. 51821002, 91733301) and the Collaborative Innovation Center of Suzhou Nano Science and Technology. Y.K. Wang acknowledges the financial support of the China Scholarship Council (No. 201806920067). Z.H.L acknowledges the financial support of the National Natural Science Foundation of China (grant number 11774304)
    Publisher
    Wiley
    Journal
    Angewandte Chemie
    DOI
    10.1002/ange.202104812
    10.1002/anie.202104812
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1002/ange.202104812
    ae974a485f413a2113503eed53cd6c53
    10.1002/ange.202104812
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Catalysis Center (KCC)

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