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.
出处
《佛山科学技术学院学报（自然科学版）》
CAS
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)
关键词
白光LED
荧光粉
老化
积分
White-LED
fluorescent powder
aging
integral
