白光LED用长效Sr2SiO4:Dy3+/低熔点玻璃荧光复合材料的设计及发光性能研究

项目名称： 白光LED用长效Sr2SiO4:Dy3+/低熔点玻璃荧光复合材料的设计及发光性能研究

项目编号： No.51202111

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 王丽熙

作者单位： 南京工业大学

项目金额： 25万元

中文摘要： 通过新型单基质白光LED荧光粉/低熔点玻璃复合荧光材料的设计、制备及发光性能研究，解决由于环氧树脂导热能力差使得大功率LED芯片产生大量热量无法散出，导致荧光粉发生严重光衰的问题。引入NH4Cl助熔剂制备组成、晶型、粒度可控的Sr2SiO4:Dy3+荧光粉，揭示Sr2SiO4:Dy3+在NH4Cl助熔剂作用下的相变规律，掺杂Bi3+、Ce3+等敏化离子，拓宽Dy3+激发范围，提高发光强度，获得高发光性能的Sr2SiO4:Dy3+荧光粉；借助热力学计算硼磷酸盐玻璃体系的导热系数、热膨胀系数、熔点等性能参数，实验优化其组分配比，制备高导热、低熔点玻璃基体粉体；将荧光粉和玻璃基体相结合，研究复合材料组成、结构及工作温度下的界面特性对发光性能的影响规律，阐明界面调控机制，设计并制备白光LED用长效、高发光性能Sr2SiO4:Dy3+/低熔点玻璃荧光复合材料，为其在白光LED中的应用提供理论指导。

中文关键词： 白光LED；镝掺杂硅酸锶；低熔点玻璃；复合发光微晶玻璃；可控制备

英文摘要： The bad light decline of phosphors for white LEDs due to the much heat from the working high-power LED chip are solved by designing and preparing the novel single host phosphor/ low melting point glass composite materials and investigating its luminescence properties in this project. The single host and single luminescence center Sr2SiO4:Dy3+ phosphors with controlled crystal form and particle size distribution are prepared by solid state reaction with flux are prapared and the mechanism of phase transition is clarified. To solve the decreased luminescence efficiency resulted from the reabsorption between R-G-B colors excited by UV-LED, the high-efficiency phosphors for white LEDs are obtained by selecting specific sensitization ions to enhance its luminescence intensity and broaden its excitation range. Based on the calculation of the properties of phosphate glass by thermodynamic software such as the coefficient of heat conductivity, the thermal expansion coefficient and melting point, the low melting point glass substrate powders with high thermal conductivity and matching thermal expansion coefficient are prepared by adjusting the ratio of compositions and optimizing the preparation technology. The high stability and long life luminescence materials for white LEDs are designed and prepared by combining the

英文关键词： white light emitting diodes；Sr2SiO4:Dy3+；low melting glass；composite luminescence glass ceramics；controllable preparation