The junction temperature of red,green and blue high power light emitting diodes(LEDs)is measured by using the emission peak shift method and the forward voltage method.Both the emission peak shift and the forward volt...The junction temperature of red,green and blue high power light emitting diodes(LEDs)is measured by using the emission peak shift method and the forward voltage method.Both the emission peak shift and the forward voltage decrease show a linear relationship relative to junction temperature.The linear coefficients of the red,green and blue LEDs for the peak shift method and the forward voltage method range from 0.03 to 0.15 nm/℃ and from 1.33 to 3.59 mV/℃,respectively.Compared with the forward voltage method,the peak shift method is almost independent of bias current and sample difference.The variation of the slopes is less than 2%for the peak shift method and larger than 30%for the forward voltage method,when the LEDs are driven by different bias currents.It is indicated that the peak shift method gives better stability than the forward voltage method under different LED working conditions.展开更多
基金Supported by the National Basic Research Program of China under Grant Nos 2011CB925604,2011CB922004the Natural Science Foundation of China(10990103,60906058)+1 种基金Shanghai Committee of Science and Technology(09DJ1400700,11DZ1140900)China Postdoctoral Science Foundation(20110490075).
文摘The junction temperature of red,green and blue high power light emitting diodes(LEDs)is measured by using the emission peak shift method and the forward voltage method.Both the emission peak shift and the forward voltage decrease show a linear relationship relative to junction temperature.The linear coefficients of the red,green and blue LEDs for the peak shift method and the forward voltage method range from 0.03 to 0.15 nm/℃ and from 1.33 to 3.59 mV/℃,respectively.Compared with the forward voltage method,the peak shift method is almost independent of bias current and sample difference.The variation of the slopes is less than 2%for the peak shift method and larger than 30%for the forward voltage method,when the LEDs are driven by different bias currents.It is indicated that the peak shift method gives better stability than the forward voltage method under different LED working conditions.
