摘要
为了提高采用光谱参数表征AlGaInP基发光二极管(LED)结温的准确度,提出了一种采用质心波长表征结温的方法。采用光谱仪测量恒定电流下、不同衬底温度时,AlGaInP基大功率LED的归一化光谱功率分布;然后计算质心波长,并得到质心波长-结温系数;再结合小电流下的质心波长,得到质心波长表征结温的公式。将5只红色和5只黄色AlGaInP基LED采用质心波长法、正向电压法、峰值波长和中心波长法得到的结温比较后发现:采用实验室常用的1nm采样间隔的可见光光谱仪,质心波长法与作为基准的正向电压法相比,平均误差仅1.24℃,准确度较高。质心波长与结温成良好的线性关系,而中心波长和峰值波长与结温成阶梯状变化,因此质心波长更适合表征AlGaInP基LED结温。
In order to improve the measurement accuracy of junction temperature of AlGaInP-based light emitting diode（LED）by spectral analysis,a new method for determining junction temperature based on centroid wavelength is developed.The normalized spectral power distributions of AlGaInP-based LEDs are measured with different substrate temperatures and constant driving currents.The centroid wavelengths are calculated and the junction temperature coefficients of centroid wavelength are obtained,and then combined with the centroid wavelength of small driving current,the expression of junction temperature with centroid wavelength is obtained.The junction temperatures of five red and five yellow AlGaInP-based LEDs are measured with the centroid wavelength method,forward voltage method,peak wavelength method and center wavelength method.The comparisons show that with the common visible light spectrometer of 1nm step,the centroid wavelength can be used to predict the junction temperature accurately,because compared with forward voltage method,which is demonstrated as the most accurate method,the mean error of the junction temperatures is just 1.24 ℃.The relationship between junction temperature and centroid wavelength is linear for any AlGaInP-based LEDs.However,it is step size for the peak wavelength and center wavelength.The centroid wavelength is more suitable for characterizing the junction temperature of AlGaInP-based LED.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2015年第3期444-449,共6页
Journal of Optoelectronics·Laser
基金
江苏省高校自然科学(14KJB140001)
江苏高校文化创意协同创新(XYN1406)
常州工学院重点(YN1209)
常州现代光电技术研究院项目(CZGY003)资助项目
关键词
光谱学
结温测试
光谱分析
发光二极管(LED)
光谱仪
质心波长
spectroscopy
junction temperature measurement
spectral analysis
light emitting diode（LED）
spectrometer
centroid wavelength
