LED光源光衰规律研究

Research on LED Light Source Lumens Depreciation Rule

光衰是反映LED性能的重要指标,而LED的光衰是一个很漫长的过程,用实测数据描绘光衰曲线是不现实的。通过对LED光衰的原因、现象进行分析,在封装材料的功能退化符合阿伦尼乌斯定律的前提下,推出了LED光通量随时间变化的数学模型,给出了利用Excel工具对较短时间的测试数据进行回归分析来评估和预测LED光衰的方法。在没有发生明显加速或减速衰减的机理和相应物理现象的现实情况下,利用该数学模型分析、预估LED光源的光衰数据不失为一个方便快捷的方法。

Light attenuation is the important index of performance of LED, and it is a very long process. It isn＇ t realistic to describe the light curve decline with the measured data. By analyzing the reasons and the phenomena of LED lumens depreciation, based on functional degradation of packaging materials fitting of the Arrhenius theorem, the mathematical model of LED flux changes with time were derived. And the methods of assessment and prediction of LED light attenuation were given, which used Excel regression analysis tools to deal with short time of test data. In the case of no obvious acceleration or deceleration of the attenuation mechanism and the corresponding physical phenomenon, it is a short-cut method to analyze and estimate the LED light attenuation data by using the mathematical model.