從1993年推出藍光發光二極體，再因藍光發光二極體與黃色螢光粉的結合使用，使得單顆發光二極體可以發出白光，在此敞開了白光發光二極體應用的大門。但到目前為止白光發光二極體還沒真正使用在主要照明。因其發光二極體約只有15~20%可轉換成可見光，其餘全部轉換成熱量。又因藍色發光二極體的晶片尺寸大小不一，在此對於不同尺寸的晶片來進行熱、光、電之分析，可在往後的模組設計中可以提供一個方向好讓設計者來設計。
本研究主要使用45 mil、24 mil、15 mil、10*23 mil的晶片的發光二極體模組，以及使用一鋁擠型散熱鰭片為主要之散熱體，又利用此結構配合各分析儀器來觀察其熱、光、電之行為以及分析出相互之關係。
本分析結果顯示，在大尺寸晶片與小晶片尺寸分析下，小晶片尺寸有比較好之散熱效應，在光衰方面又達不到其光衰溫度而使發光二極體模組可以穩定使用。又在發光二極體的使用上必須使用定電流來操作，因如用定電壓操作會使發光二極體模組的溫度拉高而使電流增高而造成惡性循環，進而影響其壽命與發光效率。

By developing the blue Light Emitting Diodes in 1993. They were widely used in markets after combining blue LED with yellow phosphors to emit white lights. The white LEDs are not already apply in main lighting because of the input power only transformed 20% to visible light, while up to 80% will be transformed to heat. There are many different size of chips in the market. In this research will analysis the relations between thermal, illumination and electron. It will give the Research and Development engineers a direction to design a LED module.

The purpose of this research is use 4 LED module that is combine by different chip size, including 45mil, 24mil, 15mil and 10*23mil. Using the aluminum heat-sink, which was made by extrusion. Analysis the relations between thermal management, illuminant performance and electron property by using different kind of equipment.

In this research, the small LED chip goes to a better property in thermal management. The working temperature will not reach the light decay temperature. In using the LED module, the operator must using it by fixing Current, or it will be cause the temperature rise by overdriving the LED module. This property will let the LED module reduce the lifetime and illuminant performance.

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