Get access

Highly Emissive and Color-Tunable CuInS2-Based Colloidal Semiconductor Nanocrystals: Off-Stoichiometry Effects and Improved Electroluminescence Performance

Authors

  • Bingkun Chen,

    1. School of Materials Science & Engineering, Micro/Nano Research Center, Beijing Institute of Technology, 5 Zhongguancun South Street, Beijing 100081, China
    Search for more papers by this author
  • Haizheng Zhong,

    Corresponding author
    1. School of Materials Science & Engineering, Micro/Nano Research Center, Beijing Institute of Technology, 5 Zhongguancun South Street, Beijing 100081, China
    • School of Materials Science & Engineering, Micro/Nano Research Center, Beijing Institute of Technology, 5 Zhongguancun South Street, Beijing 100081, China
    Search for more papers by this author
  • Wenqing Zhang,

    1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, The New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing 102206, China
    Search for more papers by this author
  • Zhan'ao Tan,

    Corresponding author
    1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, The New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing 102206, China
    • State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, The New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing 102206, China.
    Search for more papers by this author
  • Yongfang Li,

    1. CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    Search for more papers by this author
  • Cairan Yu,

    1. CAS Key Lab of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    Search for more papers by this author
  • Tianyou Zhai,

    1. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
    Search for more papers by this author
  • Yoshio Bando,

    1. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
    Search for more papers by this author
  • Shengyi Yang,

    1. School of Materials Science & Engineering, Micro/Nano Research Center, Beijing Institute of Technology, 5 Zhongguancun South Street, Beijing 100081, China
    Search for more papers by this author
  • Bingsuo Zou

    1. School of Materials Science & Engineering, Micro/Nano Research Center, Beijing Institute of Technology, 5 Zhongguancun South Street, Beijing 100081, China
    Search for more papers by this author

Abstract

The off-stoichiometry effects and gram-scale production of luminescent CuInS2-based semiconductor nanocrystals, as well as their application in electroluminescence devices are reported. The crystal structures and optical properties of CuInS2 nanocrystals can be significantly influenced by controlling their [Cu]/[In] molar ratio. A simple model adapted from the bulk materials is proposed to explain their off-stoichiometry effects. Highly emissive and color-tunable CuInS2-based NCs are prepared by a combination of [Cu]/[In] molar ratio optimization, ZnS shell coating, and CuInS2–ZnS alloying. The method is simple, hassle-free, and easily scalable to fabricate tens of grams of nanocrystal powders with photoluminescence quantum yields up to around 65%. Furthermore, the performance of high-quality CuInS2-based NCs in electroluminescence devices is examined. These devices have lower turn-on voltages of around 5 V, brighter luminance up to approximately 2100 cd m−2 and improved injection efficiency of around 0.3 lm W−1 (at 100 cd m−2) in comparison to recent reports.

Ancillary