紫外線LED(Light Emitting Diodes)使用的情境與其他波長的LED非常不同，因此在設計時需考量其獨特的需求。與一般照明不同的是，工業上的用途通常重點在於輻照度。在相同晶片規格下，較高的光萃取效率及較高的輻照度通常是不可兼得的。其中封裝設計的光萃取效率(LEE：Light Extraction Efficiency)關係到輻射通量（Radiant flux），封裝的光學元件之發光角度關係到輻照度（Irradiance）。
目前UVC LED封裝大部分是採金屬凹杯陶瓷基板加上平面石英玻璃的組合。不過此設計之光萃取效率是較為差勁的，因此如何提高LED 封裝光萃取效率，便是一個需要討論的課題。
本論文中，先探討提高LED 封裝光萃取效率及輻照度的方法，接著將一般市面上所常見的UVC LED封裝做為基準進行分類，並相互比對其光電特性，包含了輻射通量、輻照度及發光角度。本文列出了7種類型的封裝設計並將其製作成樣品，綜合考慮了上述7類的特性，改良了其中一款反射杯的封裝，並以市面上最常見的凹杯基板加上平面石英玻璃為基準，進行各種光學的量測及分析比較。最後順利的提高了LED 封裝光萃取效率(+8.7%)且提高輻照度一倍(+103%)

Applications for UV LEDs are very different from other wavelengths of LEDs, so some unique requirements for UV LEDs must be considered when some optical designs are needed. Unlike general lighting, industrial applications for UV LEDs usually focus on irradiance. However, it is nearly impossible to have high light extraction efficiency and high irradiance at the same time under the same chip size. Furthermore, the light extraction efficiency of the package design is related to the radiant flux, and the light-emitting angle of the packaged optical element is related to the irradiance.
Generally speaking, UVC LED packaging is a combination of metal concave cup ceramic substrate and flat quartz cover. However, the light extraction efficiency is poor under the general packaging. The most important topic rests in how to design and develop a UV LED packaging that can improve the light extraction efficiency.
In this thesis, methods of improving light extraction efficiency and irradiance of LED will be first discussed, and then the comparison will be made between common UVC LED packages on the market by several optical characteristics, such as radiant flux, irradiance and light angle. In our work, seven types of common packaging structures for UVC LEDs are listed and discussed. By optimizing one of the above packaging structures, various optical measurements and comparisons are analyzed. Finally, the light extraction efficiency of the optimized packaging structure increases about 8.7% and the irradiance increases about 103%.

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