| Summary: | 碩士 === 國立中央大學 === 光電科學與工程學系 === 106 === As being indicators and markers initially, the light sources of lighting-emitting diodes has become one of the most important light sources in the contempary world. Although many studies have tried to understand, explain and regulate the characteristics of LEDs, we still need to much further understand the characteristics of aging behavior of LEDs in practical applications. In this thesis, the aging chracteristics of LEDs has been studied in details. By well-controlling the junction temperature (aluminum substrate) and the driving electric current of the LEDs in the accerlating aging conditions, the corresponding emission spectra of the LEDs have been automatically measured and recorded during the whole working time. Then, analyzing the relationship of the dependence of the lifetime of LED upon the junction temperature and the driving current, one empirical accerlating aging model is proposed. Under such circumstances, it is to effectively shorten the practical evaluation process on the lifetime of LEDs.
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