结构可控AIE掺杂聚合物微粒的制备及回音壁模式光学特性研究

Miniaturized lasers have attracted much interest for photoelectron, medicine, imaging, sensing and other fields. It is difficult to improve the output performance of dye laser by increasing the amount of dye because of the aggregation-caused quenching (ACQ) effect. It is a problem to prepare the micro-nano laser resonator with the same size and shape by bottom-up self-assembly. This project is designed to synthesize different luminescent bands based on tetraphenyl ethylene aggregation-induced emission (AIE) molecules as the gain medium of miniature solid-state dye laser. In combination with microfluidic technology and emulsion-solvent evaporation method, AIE molecules doped polymer particles (eg. microspheres, microdisks, microcapsules) with uniform size and tunable shape will be prepared. The whisperinggallery-mode resonator cavity will be constructed by the microcavity effect of single particle and realized efficiently output of the laser. The impact of parameters in the process of preparation of emulsion droplets and solvent evaporation on the shape and size of AIE molecules doped polymer particles will be explored. The influence of the amount of AIE molecules, the shape and size of particles on the fluorescence properties and laser performance will be discussed systematically. The successful implementation of this project will provide a new method to develop the miniature laser and new laser materials.

微型激光器在光电、医药、成像、传感等领域应用广泛，是构建各种超微光子器件的关键部分。传统的激光染料在高浓度时荧光猝灭，极大限制了染料激光器性能的提高；发展自下而上的可控组装方法制备大小、形状均一的微纳激光谐振腔，一直是微型激光器的制备难点。本项目拟设计合成不同发光波段的基于四苯乙烯聚集诱导发光（AIE）分子作为固体染料激光器的增益介质，结合微流控技术与乳液–溶剂挥发法制备尺寸均一、形状可控的AIE分子掺杂的聚合物微粒（如微球、微盘、微囊等），利用单个微粒的微腔效应构建回音壁模式谐振腔，实现激光高效输出。揭示乳液液滴制备过程和溶剂挥发过程中各项参数对 AIE 分子掺杂聚合物微粒的形状、尺寸等的影响规律，明确AIE分子在聚合物中的掺杂量、微粒形状及尺寸等对荧光性能与激光性能的影响机制。本项目的顺利实施为新型激光材料的发展与激光器的微型化提供新思路。

传统的激光染料在高浓度时荧光猝灭，极大限制了染料激光器性能的提高；发展自下而上的可控组装方法制备微纳激光谐振腔，一直是微型激光器的制备难点。本项目以具有AIE性质的分子为基础，在其结构上进行修饰，通过与电子受体单元共轭连接，成功合成了蓝光、绿光、橙光、红光的AIE分子。与此同时，我们通过微流控技术制备尺寸均匀、可控的乳液液滴，通过调节聚合物分子量、表面活性剂种类、浓度、水层高度分别成功制备聚合物微米球，聚合物微米盘，以及聚合物微米囊泡。成功搭建了及显微成像录像与光谱测试于一体的系统，用于探究形貌与激光性能之间的关系。本项目深入探讨了聚合物组装体对激光性能的影响，研究结果对微纳尺度的激光器具有指导意义。

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