发光二极管归一化光谱模型的修正

Modification of Light Emitting Diode′s Normalized Spectrum Model

受自吸收等因素的影响,由发光二极管(LED)归一化光谱模型得到的光谱与实测LED光谱之间存在差异。为得到与实测LED光谱相吻合的归一化光谱模型,将由归一化光谱模型得到的理论光谱与实测光谱相减得到近似的自吸收谱。通过分析自吸收谱的峰值强度和半峰全宽与温度之间的关系以及其峰值能量与实测光谱峰值能量之间的定量关系,结合LED光谱的高斯模型和归一化光谱模型给出了自吸收谱的拟合表达式,并作为归一化光谱模型的修正项,对归一化光谱模型进行修正。在不同测试温度下的实验结果表明修正后的平均模型误差小于4%,证明由修正后的归一化光谱模型得到的光谱与实测光谱相吻合。

Primarily due to self-absorption, there is obvious discrepancy between the spectra from the light emitting diode＇s （LED） normalized model and the actually measured spectra. In order to make the model fit the actual spectrum, the modification of LED＇s normalized spectrum model is investigated. The self-absorption spectrum is gotten from the subtraction of the spectrum from the normalized spectrum model and the actual spectrum. Through the analysis of the dependence of the peak light intensity and the full width at half maximum in self-absorption spectrum on temperature and the relation between its peak energy and the actual spectrum＇s, the self-absorption spectrum＇s expression is provided. The fitting expression is obtained by combining Gaussian spectrum model and the normalized spectrum model. The expression is used to modify the normalized spectrum model. Experimental results show that errors by the modified model are less than 4 % at various temperatures, thus the spectra from the modified normalized model agree with the actual ones.