Characteristics of high power LEDs at high and low temperature

The high power light emitting diodes(LEDs) based on InGaN and AlGaInP individually are tested on line at temperatures from -30 to 100℃.The data are fitted to measure the relationship between temperature and the properties of forward voltage,relative light intensity,wavelength,and spectral bandwidth of two different kinds of LEDs.Why these properties changed and how these changes reflected on applications are also analyzed and compared with each other.The results show that temperature has a great influence on the performance and application of power LEDs.For applications at low temperature,the forward voltage rising and the peak wavelength blue-shifting must be considered;and at high temperature,the relative light intensity decreasing and the peak wavelength red-shifting must be considered.     

大功率LED高低温特性

在线测量了从－30至100度InGaN和AlGaInP大功率LED的各参数,拟合了两种LED正向压降、相对光强、波长、谱宽和温度的曲线,分析了两种LED参数变化的原因和这些变化对应用的影响。温度对大功率LED的性能和应用都有很大影响,低温时,应考虑正向压降的增大和波长的蓝移,高温时,应考虑光强的下降和波长的红移