| Summary: | 碩士 === 國立中央大學 === 光電科學研究所 === 100 === In the past few years, the package technology of light-emitting diodes (LEDs) has been of much more progress. The optical efficiency of LEDs is increased dramatically from 50 lm/W in 2006 to 250 lm/W in 2009. In the short future, LEDs has been penetrating to the general lighting market, especially replacing the traditional bulbs.
As of lots of advantages, such as energy saving, low cost, high luminous, long life time and pure spectrum, LEDs have been applied for many widespread range of applications. For example, traffic signals, LCD, TVs, mobile phones, general lighting and so on. However, the characteristic of the emission light will greatly vary as the junction temperature and the driving electric current change.
In this thesis, one model is proposed for intergrating the chromatic, thermal, optical, and electric characteristics. When monitoring the forward voltage under any certain electric current driven, the junction temperature can be evaluated in high accuracy. After obtaining the electric current and the junction temperature of LED in operation, the emission spectrum is also well predicted according to the proposed integration model.
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