GaN蓝色LED结温的最佳光谱带宽表征  

Characterization of Junction Temperature of Ga N Blue LED with Optimum Spectral Bandwidth

作　　者：饶丰[1,2,3] 朱锡芳[1] 徐安成[1] 褚静[1] 张燕[1] 

机构地区：[1]常州工学院光电工程学院,江苏常州213002 [2]常州现代光电技术研究院,江苏常州213002 [3]常州光电子材料与器件重点实验室,江苏常州213002

出　　处：《光学学报》2015年第1期430-437,共8页Acta Optica Sinica

基　　金：江苏省高校自然科学项目(14KJB140001);江苏省高校文化创意协同创新中心(XYN1 406);常州工学院重点项目(YN1209);常州现代光电技术研究院项目(CZGY003)

摘　　要：研究了光谱带宽表征Ga N蓝色发光二极管(LED)结温的最优方式。测量了10只Ga N蓝色LED在不同驱动电流和不同热沉温度下的归一化光谱功率分布和结温,采用最小二乘法分析得到不同n值的光谱带宽Δλn表征结温的公式,比较了该公式和电压法得到的结温之间的差别以及差别最小时的最优n值。研究表明采用不同n值的Δλn均能够表征结温。随着n值减小,Δλn表征结温的误差先减小后增大。最优n值与光谱仪的测量误差有关。采用Hass2000型光谱仪时最优n值为0.2或0.3。该研究对提高Ga N基LED结温的测量准确度具有重要意义。The optimum approach to determine junction temperature of GaN blue light emitting diode （LED） with spectral bandwidth is studied. The normalized spectral power distribution and junction temperature of ten GaN blue LEDs is measured at different drive current and heat sink temperature. The formulae for calculating junction temperature with A2, are obtained from the least-square fitting. Difference between the values by the established method and the forward voltage method is analyzed. The optimum n, which yields the least error, is obtained. It is shown that the spectral bandwidth A~, with different n can be used to determine junction temperature, and the error initially decreases with the decreasing n, and then increases. The optimum n depends on the accuracy of spectrometer, it is 0.2 or 0.3 when Hass2000 spectrometer is used. This research is very important to improve the measurement accuracy of GaN-type LED junction temperature.

关 键 词：测量 紫外荧光法 苯并(A)芘 归一化最小均方自适应 信噪比 均方误差 

分 类 号：TN312.8[电子电信—物理电子学] O433.4[机械工程—光学工程]