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首页> 外文期刊>Advanced Functional Materials >Highly Emissive and Color-Tunable CulnS_2-Based Colloidal Semiconductor Nanocrystals: Off-Stoichiometry Effects and Improved Electroluminescence Performance
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Highly Emissive and Color-Tunable CulnS_2-Based Colloidal Semiconductor Nanocrystals: Off-Stoichiometry Effects and Improved Electroluminescence Performance

机译：高发射率和可调谐颜色的基于CulnS_2的胶体半导体纳米晶体：化学计量失衡和改进的电致发光性能

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摘要

The off-stoichiometry effects and gram-scale production of luminescent CuInS_2-based semiconductor nanocrystals, as well as their application in electroluminescence devices are reported. The crystal structures and optical properties of CuInS_2 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 CuInS_2-based NCs are prepared by a combination of [Cu]/[In] molar ratio optimization, ZnS shell coating, and CuInS_2-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 CuInS_2-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 Im W~(-1) (at 100 cd m~(-2)) in comparison to recent reports.
机译：报道了基于发光的CuInS_2基半导体纳米晶体的非化学计量效应和克级产量，以及它们在电致发光器件中的应用。通过控制其[Cu] / [In]摩尔比，可以极大地影响CuInS_2纳米晶体的晶体结构和光学性能。提出了一种适用于散装材料的简单模型来解释其非化学计量效应。通过[Cu] / [In]摩尔比优化，ZnS外壳涂层和CuInS_2-ZnS合金化的组合，可以制备高发射性和颜色可调的基于CuInS_2的NC。该方法简单，无忧且易于扩展以制造数十克的纳米晶体粉末，其光致发光量子产率高达约65％。此外，检查了高质量的基于CuInS_2的NC在电致发光器件中的性能。这些器件的导通电压较低，约为5 V，亮度更高，高达约2100 cd m〜（-2），注入效率提高了约0.3 Im W〜（-1）（在100 cd m〜（-2）时） ）与最近的报告相比。

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  • 来源
    《Advanced Functional Materials》 |2012年第10期|p.2081-2088|共8页
  • 作者

    Bingkun Chen; Haizheng Zhong; Wenqing Zhang; Zhanao Tan; Yongfang Li; Cairan Yu; Tianyou Zhai; Yoshio Bando; Shengyi Yang; Bingsuo Zou;

  • 作者单位

    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;

    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;

    CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190, China;

    CAS Key Lab of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190, China;

    International Center for Materials Nanoarchitectonics (MANA)National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan;

    International Center for Materials Nanoarchitectonics (MANA)National Institute for Materials Science (NIMS) Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan;

    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;

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