Near-Band-Edge Electroluminescence from Heavy-Metal-Free Colloidal Quantum Dots

Authors

  • Zhanao Tan,

    1. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA
    2. New and Renewable Energy of Beijing Key Laboratory, School of Renewable Energy, North China Electric Power University, Beijing 102206, P.R. China
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  • Yu Zhang,

    1. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA
    2. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P.R. China
    Current affiliation:
    1. Z.T., Y.Z., and C.X. contributed equally to this work.
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  • Chuang Xie,

    1. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA
    2. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P.R. China
    Current affiliation:
    1. Z.T., Y.Z., and C.X. contributed equally to this work.
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  • Huaipeng Su,

    1. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA
    2. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P.R. China
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  • Jie Liu,

    1. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA
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  • Chunfeng Zhang,

    1. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA
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  • Nicholas Dellas,

    1. Ocean NanoTech LLC, 2143 Worth Lane, Springdale, AR 72764, USA
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  • Suzanne E. Mohney,

    1. Department of Material Science and Engineering and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA
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  • Yongqiang Wang,

    1. Ocean NanoTech LLC, 2143 Worth Lane, Springdale, AR 72764, USA
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  • Jingkang Wang,

    1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P.R. China
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  • Jian Xu

    Corresponding author
    1. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA
    2. University of Shanghai for Science and Technology, Shanghai 200093, China
    • Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA.
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Abstract

original image

The first observation of near-band-edge electroluminescent emission from the colloidal quantum dots (QDs) consisting of CuInS2-ZnS alloyed (ZCIS) cores and ZnSe/ZnS double shells is reported. Bright and organic-free electroluminescence (EL) emission peaked at red (λ = 623 nm), yellow (λ = 594 nm), and green (λ = 560 nm) wavelengths is observed from the heavy-metal-free QD light-emitting diodes (QD-LEDs). The onset voltages, luminance output uniformity, and efficiencies of the heavy-metal-free QD-LEDs are characterized.

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