功率LED高低温特性研究

摘要

对自制的GaN基大功率白光和蓝光LED及A1GaInP基的大功率红光和黄光LED进行了低温和高温下的光电特性测试，对不同材料的LED的正向电压、相对光强、波长、色温等参数随温度变化的关系进行了测试．实验结果表明，温度对功率型LED的光电特性有很大影响，随温度的降低，LED正向电压升高，峰值波长发生蓝移；高温条件下，LED发光功率降低，峰值波长发生红移．%In this paper, the high power GaN-based white and blue light-emitting diodes （LEDs） and AIGaInPbased red and yellow LEDs are fabricated and the electrical and optical properties at low and high temperature are measured. The temperature dependence of forward voltage, relative luminous intensity, wavelength, color temperature of different LEDs are analyzed. Experiment result shows that temperature has great influence on electrical and optical proprieties of high-power LEDs. When the forward voltage increased and peak wavelength blue-shift was observed with decreasing temperature. At high temperature, the optical power of LEDs decreases rapidly and the peak wavelength becames red-shift.