交流LED用红色荧光粉的制备及发光寿命调控机理的研究

In order to solve the scintillation phenomenon of the AC LEDs, the object of study of this project focuses mainly on the (orange) red phosphor for AC LEDs. The main research goal is to gain the (orange) red phosphor for AC LEDs with good heat and chemistry stability, high luminescence intensity and efficiency, specific luminescence lifetime (1-100ms). The matrix materials of the (orange) red phosphors for DC LED, which have good heat and chemistry stability, small luminous decay, good compatibility, and suitable doping ions will be employed. According to the theoretical calculation, the matrix materials and doping ions with a certain matching relations will be selected out to prepare the (orange) red phosphor for AC LEDs. The relationships between the matrix material components, kinds and concentrations of doping ions, preparation technology and the crystal structure, excitation and emission spectra, luminescence intensity, luminescence efficiency and luminescence lifetime of the phosphor will be systemically researched. The probable regulation mechanism of doping ions on luminescence lifetime of the phosphor will be discussed. Ultimately, the (orange) red phosphor with good heat and chemistry stability, high luminescence intensity and efficiency, specific lifetime(1-100ms) will be obtained. The aims of this project are to solve the scintillation phenomenon and glaring problem of the AC LEDs, and to promote the development of the AC LEDs technology.

针对交流LED在交流工作下的发光频闪问题，本项目以交流LED(橙)红色荧光粉为研究对象，以实现热和化学稳定性好、发光强度和发光效率高、具有特定发光寿命(1-100ms)的交流LED(橙)红色荧光粉为主要研究目标。拟采用直流LED(橙)红色荧光粉中热和化学稳定性好、光衰小、相容性好的基质材料为主，选择合适的掺杂离子，通过计算，优选出具有一定匹配关系的基质材料和掺杂离子进行交流LED(橙)红色荧光粉的制备；系统研究基质组分、掺杂离子种类和浓度、制备工艺等因素与荧光粉的晶体结构、激发和发射光谱、发光强度、发光效率以及发光寿命的关系；揭示掺杂离子对荧光粉发光寿命的调控机理，获得热和化学稳定性好、发光强度和发光效率高、发光寿命在1-100ms的交流LED(橙)红色荧光粉材料。旨在解决交流LED的发光频闪和炫目问题，推动交流白光LED技术的发展。

针对交流LED在交流工作下的发光频闪，以及红色交流荧光粉的缺乏问题，本项目以研究获得热和化学稳定性好、发光强度和发光效率高、具有特定发光寿命的交流LED橙红色荧光粉为主要内容。开展了以下几个方面的研究：交流LED（橙）红色荧光粉基质材料的选择及掺杂离子的优化；掺杂离子对荧光粉发光性能的影响及对发光寿命调控机理的研究；制备工艺对交流LED（橙）红色荧光粉发光性能的影响；交流LED（橙）红色荧光粉在交流LED 器件方面的应用。取得了一些重要成果：开发了一系列性能优良的直流（橙）红色荧光粉，并优选出共激活离子和其他掺杂离子进行掺杂改性，使荧光粉的发光寿命达到毫秒量级，制备得到交流LED（橙）红色荧光粉。详细研究了掺杂离子种类、浓度、制备工艺等因素与荧光粉的晶体结构、激发和发射光谱、发光强度、发光寿命等性能的关系。揭示了掺杂离子对荧光粉发光性能的影响及对发光寿命的调控机理。将交流LED（橙）红色荧光粉与蓝光/紫外LED芯片一起封装成交流LED器件，由于采用了具有毫秒级发光寿命的荧光粉，解决了交流LED器件的发光频闪。为建立交流LED用荧光粉的自主知识产权奠定了技术基础，推动了交流LED技术的发展。