Highly Emissive and Color-Tunable CuInS2-Based Colloidal Semiconductor Nanocrystals: Off-Stoichiometry Effects and Improved Electroluminescence Performance
Highly Emissive and Color-Tunable CuInS2-Based Colloidal Semiconductor Nanocrystals: Off-Stoichiometry Effects and Improved Electroluminescence Performance
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高发射率和颜色可调的 CuInS2 基胶体半导体纳米晶体：非化学计量效应和改进的电致发光性能
DOI：
10.1002/adfm.201102496
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发表时间：
2012-05-23
影响因子：
19
通讯作者：
Zou, Bingsuo
中科院分区：
文献类型：
--
作者：
Chen, Bingkun;Zhong, Haizheng;Zou, Bingsuo
报道了CuInS_2基发光半导体纳米晶的非化学计量效应、克尺度的制备及其在电致发光器件中的应用。控制CuInS2纳米晶的[Cu]/[In]摩尔比可以显著影响其晶体结构和光学性质。提出了一个适用于块体材料的简单模型来解释其非化学计量比效应。通过优化[Cu]/[In]摩尔比、硫化锌包覆和CuInS2ZnS合金化，制备了高发射率和颜色可调的CuInS2基纳米碳管。该方法简单、无麻烦、易于扩展，可制备数十克纳米晶粉末，其光致发光量子产率高达65%左右。此外，还考察了基于CuInS2的高质量NCS在电致发光器件中的性能。与最近的报道相比，这些器件的开启电压更低，约为5V，亮度高达约2100cdm-2，注入效率提高到约0.3lmW-1(100cdm-2)。
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 CuInS2ZnS 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.