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介绍了大功率发光二极管(LED)的工作原理,总结和分析了国内外文献中关于电流、结温与环境湿度对大功率LED寿命影响的研究进展,指出结点温度是决定LED寿命的最重要因素,详细评述了国内外关于大功率LED的界面热阻优化、封装热沉和散热基板设计两个方面的研究进展,为改良LED散热结构和延长大功率LED的使用寿命提供了有效的理论依据及研究方向。
The working principle of high power LED is introduced. The research progress in the influence of current, junction temperature and ambient humidity on the life of high power LED is summarized and analyzed in literature both at home and abroad. It is pointed out that junction temperature is the most important factor that determines LED lifetime Factors, detailed comments on the domestic and international research on high-power LED interface thermal resistance optimization, package heat sink and thermal substrate design two aspects, to improve the LED cooling structure and extend the service life of high-power LED provides an effective theoretical basis And research direction.