非晶光子晶体对长余辉材料发光性能的调控

项目名称： 非晶光子晶体对长余辉材料发光性能的调控

项目编号： No.51503034

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 石小迪

作者单位： 东华大学

项目金额： 20万元

中文摘要： 长余辉发光材料具有环境友好、高效节能的优点，已经在应急照明、显示、装饰等领域得到广泛应用，但仍存在发光强度弱，余辉时间短的缺点。通过改变发光材料或基质材料种类，改变制备工艺或条件来提高长余辉材料的发光性能的方法均存在适用的局限性。本项目拟利用非晶光子晶体来调控稀土长余辉材料发光性能并研究其作用机理。非晶光子晶体具有类似于光子晶体的赝带隙，同时具有非角度依赖的光学性能，利用非晶光子晶体对稀土长余辉材料发射光之间的共振散射作用和干涉效应，可在宽角度范围内实现初始亮度的提高；同时光子赝带隙能够有效的调控稀土长余辉材料发光中心的自发辐射，通过抑制自发辐射的衰减速率，延长余辉时间。通过研究非晶光子晶体的无序度、折射率、粒径分布、厚度、入射角度等因素对其调控性能的影响，有望得到一种有效提高长余辉材料发光性能的新方法，该结构增强机理可适用于不同发射波长范围和种类的长余辉材料。

中文关键词： 非晶光子晶体；长余辉发光；初始亮度；余辉时间

英文摘要： Long persistent phosphor materials (LPP) is a kind of environmentally friendly, energy efficient materials, and has been widely used in illumination, display, decoration and so on, However, LPP currently has two issues: low afterglow intensity and short afterglow time. The commonly used methods to improve its luminescence properties are by changing host material or luminescence center, or by optimizing the preparation process or technology, which is tedious and not applicable. This project is going to provide a new method to improve the luminescence properties of LPP by introducing amorphous photonic crystals (APC) into the system, there exists photonic pseudogap in APC, which is direction-independent, so light can be scattered evenly in all directions without orientation, which implies the afterglow intensity can be enhanced in wide angles by resonance scattering and interference with APC. Meanwhile, the pseudogap of APC can modulate the spontaneous and restrain attenuation rate of luminescence center in LPP, the afterglow time is therefore extended. By adjusting the latex spheres’ refractive index, diameter, particle size distribution, film thickness and the degree of disorder, the light modulating properties and principles of APC on LPP will be discussed. It is expected to find a new way to improve the luminescence properties of LPP in wide angles, and the enhancement mechanism is applicable to other LPP.

英文关键词： amorphous photonic crystals;long persistent phosphor;afterglow intensity;afterglow time