基于积分球的蓝光LED荧光粉测试系统  

Testing System of Phosphor Excited by Blue LED Based on Integral Sphere

作　　者：肖华[1] 吕毅军[1] 高玉琳[1] 朱丽虹[1] 陈国龙[1] 陈忠[1] 

机构地区：[1]厦门大学电子科学系,福建省半导体照明工程技术研究中心,福建厦门361005

出　　处：《光电技术应用》2013年第4期21-25,共5页Electro-Optic Technology Application

基　　金：国家自然科学基金项目(11104230);福建省重点科技项目(2011H6025;2012H0039)

摘　　要：为尽可能反映荧光粉在实际工作条件下的发光性质,准确测量荧光粉的发光性能,提出了一种基于积分球的荧光粉发光性能测试系统。该系统采用蓝光LED作为激发光源,配置有TEC控温系统对光源有效实施控温,可提供持续稳定的激发荧光粉发光。采用出光筒控制光源方向和积分球收集光线,能有效防止能量损失,提高测试的精确性。通过实验得到了不同强度蓝光激发下的荧光粉光谱功率分布以及发光效能、量子效率、光转换效率等参数的变化规律。随着驱动电流的增大,由于蓝光芯片内量子限制斯塔克效应,从而导致蓝光峰值波长出现小幅度的蓝移。三种效率在小电流下基本呈线性下降趋势,且在大电流下趋于平缓。实验结果表明,该系统及方法可以有效地评价实际LED芯片工作状态下的荧光粉发光性能。A testing system for phosphor luminous characteristics based on integral sphere is proposed so as to show luminous characteristics of phosphor at actual operation circumstances and measure its luminous characteristics accurately.Blue LED is used as an excited source in the system.TEC temperature control system is used to control the temperature of the source effectively.And continuous and stable excited light is provided to excite phosphor illumining.Energy loss is prevented effectively and testing accuracy is enhanced for the direction of source controlled by a light tube and light ray collected by integral sphere.Based on experiments,spectrum power distributions of phosphor excited by blue light with difference light strength and variation rules of parameters such as luminous efficiency,quantum efficiency and light conversion efficiency are got.With the increasing of driving current,a small blue shift appears in blue light peak wavelength for quantum confined Stark effect in blue light chip.Three kinds of efficiency almost show linear decline trend at low current and then approach to constant at high current.Experimental results show that luminous characteristics of phosphor on real LED chip at operation state can be evaluated effectively by the system and method.

关 键 词：白光LED 荧光粉 发光效能 量子效率 光转换效率 

分 类 号：TN312.8[电子电信—物理电子学] O433.2[机械工程—光学工程]