白光LED中的荧光粉老化研究  

Research on the degradation of phosphors in White-LED

作　　者：陈宇彬[1] 李炳乾[2] 范广涵[1] 

机构地区：[1]华南师范大学光电学院,广东广州510630 [2]佛山科学技术学院光电子与物理学系,广东佛山528000

出　　处：《佛山科学技术学院学报（自然科学版）》2007年第4期6-8,共3页Journal of Foshan University(Natural Science Edition)

基　　金：广东省自然科学基金项目(04011462);佛山市科技发展专项资金项目(04030021)

摘　　要：利用同批次芯片的白光LED与蓝光LED在相同条件下进行老化实验,根据老化过程中电致发光谱(EL谱)和光功率变化情况计算了白光LED中蓝光被转化为黄光的比例,研究了荧光粉转换效率对白光LED老化的影响,并测量了荧光粉老化规律,发现转换率呈指数衰减变化,且电流加大时衰减也更快。据此认为荧光粉转换率的衰减是造成白光LED老化的重要因素之一。We performed aging study using White-LED.and Blue-LED of same batch of chips under same conditions. Then we calculated the conversion rate from blue light to yellow light in White- LED, according to the electroluminescent spectrum and ray-power. It＇s indicated that the rate reduces following exponential function, and it reduces faster when the electrical current is bigger, which conclude, is an important reason for degradation of White-LED.

关 键 词：白光LED 荧光粉 老化 积分 

分 类 号：TN365[电子电信—物理电子学]