单色LED信号灯温度特性研究

摘要

本文基于积分球光度测量系统对单色LED信号灯的变温光谱曲线进行了测试。实验结果发现,温度的升高对发光波长及光通量产生显著影响。红,蓝,绿,白LED光谱均出现红移现象,改变量大致为0．13 nm/K,光通量呈指数形式递减,衰减范围在2%~10%内,色温保持稳定。本文从LED的材料及发光机制两方面对波长的偏移及光通量的改变进行了分析。%In this paper, the spectrum of monochrome LED was tested by using integrating-sphere system. And the luminous flux and color temperature were obtained at the same way. We found Four LED spectrum were appeared red shift phenomenon with the increase of temperature. And the amounts of change were 0. 13 nm/K. Luminous flux was decreasing between 2% to 10% at the exponential form. Color temperature keeps stability with the change of temperature. The phenomena was explained from the LED structure and material properties.