本研究中，針對圓形反射杯之設計，主要根據三種參數進行模擬比較，分別為反射杯的開口大小、深度、角度。由模擬結果得知，當反射杯開口越大時光通量略降，深度越深時光通量提升但角度變窄；當反射杯角度越大時光通量略降而角度在45o時有最大的發光角度；透過模擬結果分析，由於反射杯開口越小以及深度越深時，Bonding工作區域就越小，因此本實驗選擇開口直徑3.2 mm、深度0.4 mm的設計作為後續製程的規格。
將製作完成的白光LED元件輸入電流350 mA，矽反射杯白光LED的光通量平均為53.72 lm，玻璃反射杯白光LED的光通量平均為55.05 lm，玻璃反射杯白光LED的光通量提升了2.48%，而矽反射杯白光LED的發光角度，在0度線時發光角度為122o，在90度線時發光角度為122.75o，玻璃反射杯白光LED的發光角度，在0度線時發光角度為115.81o，在90度線時發光角度為115.64o。
玻璃反射杯不但沒有像矽反射杯於蝕刻時所造成的波紋缺陷，且可改善光輸出通量及光形，使得光在任何角度上光強度是均勻的，並可根據不同需求來改變反射杯的形狀。

In the study, the design of the cavity is according to three parameters. There are open size、 depth and angle, when the opening larger has a lower luminous flux, the depth deeper has a higher luminous flux but the angle is smaller, and the angle greater has a lower luminous flux but the angle is 45 degree have a maximum angle. Because of the cavity is opening smaller and deeper cause of the bonding work area is smaller. So I chose the opening diameter of 3.2 mm and depth 0.4 mm.
The fabricated device, when the operating current is 350 mA, the luminous flux of white LED with silicon cavity and glass cavity are 53.72 lm and 55.05 lm, respectively. Therefore the luminous flux of white LED which is glass cavity is increased 2.48% compared with that of white LED with silicon cavity. The emitting angle of silicon cavity and glass spacer white LED, in the 0 degree line emitting angle of 122o and 115.81o, respectively. In 90 degree line the emitting angle for 122.75o and 115.64o, respectively.
The glass spacer not like silicon substrate etching defects, and can improve the luminous flux and angle of light. Because of the etching defects, white LED with silicon cavity has a lower luminous flux. The luminous intensity is uniform at any point of light angle, and can change the shape of the cavity according to the different needs.

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