石墨烯基柔性微纳结构的制备及其对ZnO发光增强的调控机制研究

Zinc oxide (ZnO) based short-wavelength light emitting devices, which are the key components of optoelectronic integration and information technology, show urgent applications in the fields of green lighting, optical communications, optical information storage, etc. For the problems of low emission efficiency of ZnO based short-wavelength light emitting devices, this project for improving the emission of ZnO nanorods will be presented, which combines fabrication of graphene-based flexible micro-nano structures, dynamic regulation of graphene plasmons (GPs) resonance characteristics, regulation mechanism of enhanced ZnO emission. Based on photoinduced deformation effects, fabrication method of graphene-based flexible micro-nano structures is proposed. The mechanism of the optical-thermal-force multi -physical field in the process is deeply studied. Controllable fabrication process of graphene-based flexible micro-nano structures with simple, low cost properties is developed. Based on mechanical deformation of flexible substrate, dynamic regulation mechanism of GPs resonance characteristics is proposed. The relationships of tensile strain, micro-nano structure and GPs resonance characteristic are established. The theoretical model of emission enhancement and key parameters is set up, in order to clarify the regulation mechanism of enhanced ZnO emission. This project is aiming to reveal the regulation mechanism of graphene-based flexible micro-nano structures on enhanced ZnO emission, which lays the foundations of theoretical aspects and experimental of preparation and application of ZnO based short-wavelength light emitting devices.

氧化锌（ZnO）基短波长发光器件作为光电子集成与信息技术的关键部件，在绿色照明、光通讯、光信息存储等领域具有迫切的应用需求。针对ZnO基短波长发光器件发光效率低的难题，本项目拟以提高ZnO发光性能为导向，围绕石墨烯基柔性微纳结构制备方法、石墨烯等离激元（GPs）共振特性动态调控、ZnO发光增强调控机制开展研究工作。基于光致形变效应，提出一种石墨烯基柔性微纳结构制备方法，深入研究工艺过程中的光-热-力多物理场作用机制，开发出简单、低成本的石墨烯基柔性微纳结构可控制备工艺；提出基于柔性基底机械形变的GPs共振特性动态调控机制，建立拉伸应变、微纳结构与GPs共振特性的影响关系；建立发光增强与关键参数的理论模型，明确ZnO发光增强的调控机制。本项目旨在揭示石墨烯基柔性微纳结构对ZnO发光增强的调控机制，为ZnO基短波长发光器件的制备和应用奠定理论分析和实验基础。

针对ZnO基短波长发光器件发光效率低的难题，项目以ZnO发光性能为研究对象，以光热界面驱动变形技术为手段，研究石墨烯基柔性微纳结构对ZnO发光增强的调控机制并开展相关的基础理论和关键技术研究。主要完成的工作包括：1、提出了基于光热界面驱动的石墨烯基柔性双层结构设计方案，基于聚合物微纳制造技术实现了石墨烯基柔性双层结构界面的制造，并从变形动力来源与应力梯度构建了形式，分析了光热界面驱动机理的可行性；开展了石墨烯基柔性双层结构单程光-机械变形行为的表征与操控方法研究，通过分析、控制不同的影响因素，如纳米石墨烯质量分数、近红外光照强度、PDMS层厚度等，实现了柔性双层结构稳态单程光-机械变形的可控调节；设计了多种界面约束形式，利用微纳制造工艺，将PDMS薄膜层和PDMS/石墨烯纳米复合物薄膜层的连续界面人为进行空域分割，实现了界面约束由大到小的设计与制造。2、建立了石墨烯理论模型，明确了低高频波段下化学势、薄片宽度和载流子浓度对石墨烯等离激元激发的影响规律。验证了石墨烯等离激元的存在条件，只有当电导率虚部为正时，才能激发石墨烯表面的等离激元。获得了不同参数和不同波段对石墨烯等离激元激发的影响规律。3、实现了石墨烯基柔性微纳结分别对ZnO紫外发光性能的提高及缺陷发光的抑制作用。结合石墨烯等离激元共振效应，设计了ZnO/石墨烯/PDMS复合结构。改变复合结构基底的弯曲程度，研究了石墨烯等离激元共振特性对ZnO纳米线紫外发光的增强和缺陷发光的抑制作用。.获科技奖励2项，共发表高水平SCI论文8篇，已授权国家发明专利5项，获软件著作权项2项，培养研究生4名。