CdS@SiO2 Core-Shell Electroluminescent Nanorod Arrays Based on a Metal-Insulator-Semiconductor Structure.
CdS@SiO2 Core-Shell Electroluminescent Nanorod Arrays Based on a Metal-Insulator-Semiconductor Structure.
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基于金属-绝缘体-半导体结构的CdS@SiO2核壳电致发光纳米棒阵列
DOI：
10.1002/smll.201601548
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发表时间：
2016-08
期刊：
影响因子：
13.3
通讯作者：
Pan Caofeng
中科院分区：
文献类型：
--
作者：
Wang Chunfeng;Peng Dengfeng;Zhao Jing;Bao Rongrong;Li Tianfeng;Tian Li;Dong Lin;Shen Changyu;Pan Caofeng
一维(1D)半导体发光器件(LED)领域已经取得了巨大的进展，但基于一维硫化镉纳米结构的LED却鲜有报道。提出了一种基于Au-SiO_2-CDS金属绝缘体-半导体(MIS)结构的Cd S@SiO_2核壳纳米棒阵列LED的制备方法。MISLED表现出较强的黄光发射，低阈值电压为2.7V，电致发光范围为450~800 nm，并在700 nm处观察到肩峰，这与CdS纳米棒的缺陷和表面状态有关。系统研究了SiO_2壳层厚度对电致发光强度的影响。该器件具有1.5μm的高发光空间分辨率，即使在室温下搁置至少3个月仍保持良好的发射性能。此外，制作工艺简单，成本低，可以在柔性衬底上制作，作为柔性光源具有很大的应用潜力。该样机有望为开发高分辨率、低成本、稳定性好的大规模发光器件开辟一条新的途径。
Enormous advancement has been achieved in the field of one-dimensional (1D) semiconductor light-emitting devices (LEDs), however, LEDs based on 1D CdS nanostructures have been rarely reported. The fabrication of CdS@SiO2 core-shell nanorod array LEDs based on a Au-SiO2 -CdS metal-insulator-semiconductor (MIS) structure is presented. The MIS LEDs exhibit strong yellow emission with a low threshold voltage of 2.7 V. Electroluminescence with a broad emission ranging from 450 nm to 800 nm and a shoulder peak at 700 nm is observed, which is related to the defects and surface states of the CdS nanorods. The influence of the SiO2 shell thickness on the electroluminescence intensity is systematically investigated. The devices have a high light-emitting spatial resolution of 1.5 μm and maintain an excellent emission property even after shelving at room temperature for at least three months. Moreover, the fabrication process is simple and cost effective and the MIS device could be fabricated on a flexible substrate, which holds great potential for application as a flexible light source. This prototype is expected to open up a new route towards the development of large-scale light-emitting devices with excellent attributes, such as high resolution, low cost, and good stability.
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