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首页> 外文期刊>Organic Electronics >Compositional engineering of multinary Cu-In-Zn-based semiconductor nanocrystals for efficient and solution-processed red-emitting quantum-dot light-emitting diodes
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Compositional engineering of multinary Cu-In-Zn-based semiconductor nanocrystals for efficient and solution-processed red-emitting quantum-dot light-emitting diodes

机译：高效固溶加工的红色发光量子点发光二极管的多元Cu-In-Zn基半导体纳米晶体的组成工程

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摘要

For quantum-dot light-emitting diodes (QD-LED), replacing Cd-based II-VI nanocrystals (NCs) with the Cu-In-Zn-VI counterparts combines the consideration of environmental benignity and device performance. To prove this concept, the chemical composition and nanostructures of Cu-In-Zn-VI nanocrystals need to be thoroughly explored aiming to competitive optoelectronic properties. Herein, we reported a detailed study of Cu-In-Zn-Se-S synthesis and demonstrated how the optical bandgap, emission full width at half-maximum (FWHM) and the performance of QD-LED were tuned by simply changing the dose of precursors in a non-injection synthesis. Evident by optical absorption, the optimization of Se and Cu doses enabled good dispersity and desired emission wavelength. Further analysis of photo-electron spectroscopy revealed the chemical composition from core to surface favored soft confinement of exciton by gradually increasing the loading of Zn element. Finally, we successfully demonstrated solution-processed QD-LEDs with the best external quantum efficiencies as high as 4.2% and emission wavelength centering at 663 nm. To our best knowledge, this is the most efficient solution-processed red QD-LED based on Cu-In-Zn-VI nanocrystals.
机译：对于量子点发光二极管（QD-LED），用Cu-In-Zn-VI替代品替代基于Cd的II-VI纳米晶体（NC）结合了对环境良性和器件性能的考虑。为了证明这一概念，需要彻底探索Cu-In-Zn-VI纳米晶体的化学组成和纳米结构，以具有竞争性的光电性能。在此，我们报道了对Cu-In-Zn-Se-S合成的详细研究，并演示了如何通过简单地改变LED的剂量来调节光学带隙，半最大发射全宽（FWHM）和QD-LED的性能。非注射合成中的前体。通过光吸收可以看出，硒和铜剂量的优化实现了良好的分散性和所需的发射波长。光电子能谱的进一步分析表明，从核到表面的化学组成是通过逐渐增加Zn元素的负载来促进激子的软约束。最后，我们成功地展示了经溶液处理的QD-LED，其最佳外部量子效率高达4.2％，发射波长中心为663 nm。据我们所知，这是基于Cu-In-Zn-VI纳米晶体的最有效的溶液处理红色QD-LED。

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