本篇論文是以增加白光發光二極體之功能性為研究目標，提出多晶封裝結構結合改良型全方位反射器與二氧化鈦光觸媒，製作兼具可變顏色和空氣淨化功能的白光LED。改良型全方位反射器是根據先前研究的全方位反射器去做改良，使光的入射角度40°時，波長380 nm之穿透率為40 %。二氧化鈦光觸媒必須照射紫外光才能發生作用，本研究將二氧化鈦光觸媒噴塗在改良型全方位反射器的背面以製作成複合元件，封裝在紫外光激發的白光LED上，大角度出射的紫外光可激發二氧化鈦光觸媒進行空氣淨化。將複合元件用以封裝白光發光二極體，並以田口式法調配螢光粉配方，當二氧化鈦光觸媒層為三層，在20 mA電流驅動下，可得色座標為（0.3319, 0.3224），色溫為5518 K、演色性為94，光場分佈之均勻性佳，並且可以降解亞甲藍。本文提出將（λpeak = 372 nm）一紫光晶粒（λpeak = 410 nm）和藍光晶粒（λpeak = 465 nm）結合上述紫外光激發白光發光二極體共同封裝在此結構中，藉由螢光粉選擇和控制電流可獲得兼具顏色可變性和空氣淨化之多功能白光發光二極體，經實驗驗證，可調控出色座標（0.3332, 0.3357），色溫5461 K，演色性83的白光規格。最後將此多功能白光LED之晶粒更換為大功率晶粒，製作成燈具進行氨氣分解實驗，證實多功能白光LED確實具有空氣淨化之功能，在紫外光和藍光晶粒以20 mA和100 mA電流驅動下，經過5小時持續作用，氨氣去除率約為42.5 %和64.3 %。

The objective of this thesis to increase the functionality of white light emitting diode (WLED) use the multi-chips structure, modified omni-directional reflector (ODR) and TiO2 photocatalyst to package the WLED which has functionality of the tunable color garmut and air purification. The modified ODR has been improved according to the previous research, which property is that when light incident angle is 40°, the wavelength of 380 nm of transmittance is 40%. Because TiO2 photocatalyst have to be under the UV light emitting and TiO2 photocatalyst can be used to do air purification, we spray the TiO2 photocatalyst on the back side of the modified ODR to fabricate the compound element, and packaged with UV-excited white LED, where TiO2 can be work over the emitting angle of 40°. To packaged WLED with compound element and controlled the composition and concentration of phosphors blend layer by means of Taguchi Method. When TiO2 photocatalyst layers is 3 layers and WLED is at a constant driving current of 20 mA, the color coordinate for light source made was (0.3319, 0.3324), the color correlated temperature (CCT) was 5518 K, the color rendering index (CRI) was 94, the angle distribution of properties of WLED is uniformity, and it could work for degradation of methylene blue. This study proposed a purple light chip (λpeak = 410 nm) and a blue light chip (λpeak = 465 nm) combined with the above structure of UV-excited WLED, and we can achieve a multifunctional WLED which can be color tunable and for air purification by controlling the concentration of phosphor and driving current. Specifically, the color coordinate for light source made was (0.3332, 0.3357), the CCT was 5461 K and CRI was 83. Finally, we changed the chips of a multifunctional WLED for high power chips, and fabricated the WLED lamp to do the experiment of degradation of ammonia concentration. The result showed the multifunctional WLED can really work for air purification. The UV light chips and blue light chips were applied driving current at 20 mA or 100 mA, and it worked for 5 hrs, the degradation rate of ammonia concentration were 42.5 % or 64.3 %.

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