金属纳米颗粒包裹氧化锌微米线基电致波导发光器件研究

Zinc oxide (ZnO) microwires (MWs) based electroluminescent devices have important aspects. In order to realize electrically waveguide light-emitting devices, two tipical challenges and key scientific problems needed to be overcome, such as the suppression and adjustment of the surface defect modes of ZnO MWs, and the construction of hybrid waveguide structures along with the direction the ZnO MWs. So far, due to ZnO MWs metal-semiconductor-metal (MSM) structures, electrode contact properties, wavelength of the electroluminescent center, and emission region depend on the morphology and size of ZnO MWs. In consequence, the physical mechanism of electroluminescence is not clear and further investigation is expected. Meanwhile, while possessing natural resonant cavities, ZnO MWs are an ideal platform to design laser diodes, efficient light emitting devices (LED) and so on. But the gain area is restricted to the cross section. There is no relevant device structure, which can be used to modulate the resonant mode of photons confined within the cross section into the waveguide resonant modes along the length direction of ZnO MWs. This project aims at that, the characteristics of metal-semiconductor contact, the EL properties and emission mechanism of the device will be studied owing to the MSM structures, which will be designed based on bare ZnO MWs, and metal nanoparticles aggregation ccoated ZnO MWs, as well as electrically driven plasmon mediated non-radiative energy transfer between the surface defect modes of ZnO MWs and the localized surface plasmon modes of metal nanoparticles. This project also helps to further explore the modulation of surface defect states on account of metal nanoparticles aggregation, and the transport process of photons in the form of waveguide mode by means of surface plasmon wave, which excited by hybrid plasmonic waveguide nanostructures. Therefore, with the aid of this project, electrically induced waveguide light emitting devices can be achieved.

氧化锌（ZnO）微米线基电致发光器件在诸多方面有重要的应用前景，实现ZnO微米线基电致波导发光器件需要克服两个普遍难题和关键问题：抑制微米线表面缺陷态，构建沿着微米线长度方向的波导结构。目前单根ZnO微米线金属-半导体-金属（MSM）结构的电极接触属性、发光中心以及发光区域严重依赖于微米线形貌与尺寸，电致发光的机理还不够透彻；ZnO微米线具有天然微腔结构，增益区域受限于微米线的横截面，目前还没有相关器件结构能够实现将光子的谐振模式转化为沿着微米线长度方向的波导谐振模式。本项目基于单根ZnO微米线和金属纳米颗粒包裹的微米线MSM结构，研究器件的电极属性、发光来源，以及金属纳米颗粒表面等离子体介入下的非辐射能量转移过程，探索金属纳米颗粒聚集体对微米线表面缺陷态的调制，表面等离子体波调制光子的输运过程以实现将光子限域在沿着微米线长度方向的波导模式之中，有望实现基于单根微米线的电致波导发光器件。