基于Mie散射理论的白光发光二极管荧光粉散射特性研究  

Research on scattering properties of phosphor for high power white light emitting diode based on Mie scattering theory

作　　者：钱可元[1] 马骏[1] 付伟[1] 罗毅[1] 

机构地区：[1]清华大学深圳研究生院,深圳518055

出　　处：《物理学报》2012年第20期252-259,共8页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2008AA03A194);深圳市重点实验室提升计划(批准号:CXB201005250038A);深圳市科技发展计划(批准号:2009003)资助的课题~~

摘　　要：基于Mie散射理论,对大功率发光二极管封装中荧光粉的光激发、吸收、散射等作用进行数值模拟,仿真计算在不同白光色温时前后向散射光的强度比例,研究了荧光粉的颗粒大小对白光发光二极管最大光通量的影响.对保型荧光粉涂覆结构中不同直径荧光粉颗粒和不同色温时的光效进行了分析,还分析了同样色温下不同荧光粉颗粒直径、涂层的厚度对白光发光二极管出光的空间色温分布均匀性的影响.研究中所采用的器件激发光谱和发射光谱都为材料的实测光谱,而并非假设的单一光谱.研究表明:在采用保型荧光粉涂覆结构的前提下,当荧光粉颖粒直径为0.5μm时能使发光二极管光通量达到最大;荧光粉颗粒越小,发光二极管空间色温分布均匀性越好;对给定的封装结构,荧光粉涂层厚度为0.8 mm时空间色温分布均匀性最佳.Based on Mie scattering theory, the phosphor particle＇s scattering effect were simulated including light excitation and absorption. The light intensity proportion changes of forward and backward scattering light with different white light emitting diode （LED） color temperature were calculated. We also analyzed the phosphor particle size effecting the luminous flux of white LED and light color distribution of angle. Devices＇ excitation and emission spectrums used in our simulation were real measured spectrums of the material, rather than assuming a single spectrum. Our investigation discloses that when a conformal phosphor layer was adapted, phosphor particle diameter of 0.5 μm, makes maximum luminous flux and phosphor particles smaller, light color distribution of angel is better. While for given package structure, the best spatial color uniformity can be achieved with a phosphor layer thickness of 0.8 mm.

关 键 词：大功率发光二极管封装 荧光粉 光通量 光色分布 

分 类 号：TN312.8[电子电信—物理电子学]