颜色可调稀土双掺杂氮化物发光材料及其转换的暖白光LED

白光LED将主导下一代固态照明，而暖白光LED能够提供更温暖、舒适和交通更安全的照明，更受青睐。利用荧光材料转换是当前白光LED采用的主流技术，广泛应用的YAG:Ce黄色荧光材料红光成分不足，为获得暖白光需混合Eu2+激活的氮化物红色荧光材料，存在效率低和颜色漂移问题。本申请旨在研制一种非混合型的、红色成分丰富的单一基质荧光材料及其转换的暖白光LED。在前期研究工作基础上提出，在Eu2+激活的氮化物SrAlSi4N7红色荧光材料中再引入黄色发光中心Ce3+形成稀土双掺杂氮化物SrAlSi4N7: Ce3+/Eu2+，以期实现发光颜色在黄色和红色之间连续调节，获得暖白光。研究发射光谱分布与Ce3+/Eu2+浓度的依赖关系，优化材料组分和制备条件，封装暖白光LED。本项目对于形成具有自主知识产权的LED荧光材料与器件技术，促进我国固态照明的创新研究具有重要意义。

White LED ( light emitting diode ) is going to govern the solid state lighting for the next generation.The warm white LED is paid more attention because it can provide warm and comfortable feeling and safe traffic at night. Using phosphor to convert blue light of LEDs into white light is the main method to generate white light for present white LEDs.The widely used yellow emitting YAG:Ce phosphors lack enough red components.To achieve warm white light, red emitting phosphors such as Eu2+ activated nitrides are needed to mix with the yellow one, however leading to low converting efficiency and color point shift.This project attempts to achieve a unblended,single phosphor with enough red luminescence and it converted warm white LED. Basing on our previous research work, we propose to codope Ce3+ into Eu2+ activated SrAlSi4N7 red phosphor to form rare earth ion doubly doped material:SrAlSi4N7:Ce3+/Eu2+. It is expected that emitting color tuning between yellow and red is performed and consequently warm white light is obtained. In this project, the study will be focused on dependence of emission spectral distribution on Ce3+/Eu2+ concentrations, optimizing of material compositions and prepartion conditions and then encapsulation of warm white LEDs. The present project is significant for forming our self-owned LED phosphors and LED devices, and also for pushing our creative study of solid state lighting.