本論文主要將全方位反射鏡(Omni-Directional reflector, ODR)製作於
垂直式磷化鋁銦鎵發光二極體，利用光由密介質進入疏介質產生全反射
原理，提升發光二極體的外部量子效率。
全方位反射鏡(ODR)主要由二氧化矽(SiO2)、二氧化鈦(TiO2)和銀(Ag)
所組成，我們設計了四種不同結構，分別從週期數的增加以及介電層與
金屬層間附著層的改變，來分析兩者對於反射率的影響。首先，以光學
模擬軟體Macleod 進行反射率模擬，初步得知，當光由垂直入射時，週
期數越多，反射率越高，且反射光譜中的禁止帶(Stop Band)的邊界將越明
顯；而在週期數固定下，氧化物附著層比金屬附著層的反射率高出約
0.5%，當週期數增加時，兩者間的差距也隨之增加。
接著，將上述四種結構做成元件，量測元件的各項光電特性，並且
將測量的結果與模擬數值比較，發現附著層相同時，週期數越多，反射
率越高；當週期數固定，改變附著層材料時，氧化物附著層較金屬附著
層有較高的輸出功率，與模擬結果的趨勢相同。

We demonstrate the application of internal reflection on increasing the
external quantum efficiency of light emitting-diodes (LED). In this thesis, we
employ Omni-Directional reflector (ODR) in vertical AlGaInP-based LED.
And we successfully make enhancement of light output power.
Omni-directional reflector (ODR) is made of alternating layers of SiO2,
TiO2 and Ag. We exhibit four different structures of LEDs including various
number of reflector pairs and adhesive layers, which is deposited between
dielectric layer and metallic layer. At first, we utilize the simulation result of
reflectance spectra by Macleod software. And it indicated that the reflectivity
would be increased by increasing the number of reflector pairs, and the
boundary of stop band will be obviously. In the same period, the output power
of oxide adhesive layer is 0.5% higher than that of metal adhesive layer, and it
would increase with the period.
From the measure results, we find that in the same period, the reflectance
spectra of oxide adhesive layer is higher than that of metal adhesive layer
absolutely. And this agree with the consequence of simulation.

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