The analysis of measurement methods for high power LED thermal resistance

With the development of high power LED technology, junction temperature as a key factor constrains the performance and the service life of LED, and the main parameter of junction temperature is thermal resistance. Therefore, how to measure the thermal resistance of high power LED quickly and accurately plays an important part in improving the performance and the service life of LED. Based on the study of high power LED thermal resistance and its basic measurement principle, this paper provides an analysis of the different measurement methods for thermal resistance, including of infrared thermal imaging method, spectra method, electrical parameters method, and so on, then compares and analyses their merits and shortcomings, applicable areas and improvement measures that provide the reliable basis for measuring the thermal resistance of high power LED.