臺灣博碩士論文加值系統

在本論文中，提出一種RGB螢光粉-轉換型白光發光二極體的設計，此設計乃在LED的封裝表面塗佈一層光觸媒，利用氧化鉍光觸媒在藍光與UV光譜之吸收特性，藍光與UV光之漏光問題可以有效被降低。此外，光觸媒之塗佈層恰可扮演散射器之角色用以緩和眩光問題，氧化鉍光觸媒以噴霧熱解法合成，所合成之Bi2O3光觸媒電子能階為2.38eV；比表面積為4.465m2/g。為了驗證此設計之可行性，製造白光LED以3.48V/20mA之正向電壓/電流驅動，並使用LED特性系統量測具有CIE(x, y)色座標為(0.349, 0.393)，相對色溫為4991K。在360-420nm波長範圍之UV光之能量抑制百分比超過52.33%；在420-780nm波長範圍之可見光之能量抑制百分比為33.11%。由於散色現象，光觸媒之塗佈層恰可扮演散射器之角色，眩光問題明顯獲得緩和。因此，在本研究中一種兼具健康、安全與環境友善的LED光源已被成功提出。

In this thesis, a design of RGB phosphor-converted white light-emitting diode was proposed which is coated with a layer of photocatalyst on the surface of LED package. Utilize the characteristic of absorption spectrum in blue and UV regions of bismuth oxide photocatalyst, the blue light and UV leakage problems can be significantly reduced. In addition, the coating layer of photocatalyst can properly play a role of diffuser to ease the glare problem. The bismuth oxide photocatalyst was synthesized by spray pyrolysis. The energy gap of the synthesized Bi2O3 photocatalyst is 2.38eV; the specific surface area is 4.465m2/g. To show the feasibility of the design, white-light LEDs were fabricated which was driven at forward voltage/current of 3.48V/20mA, and was tested by LED characterization system with CIE chromaticity coordinates (x, y) of (0.349, 0.393) and correlated color temperature of 4991K. The UV suppressed ratio is over 52.33% in the region from 360-420nm; the visible light suppressed ratio is 33.11% in the region from 420-780nm. Due to the scattering phenomenon, the coating layer of photocatalyst can properly play a role of diffuser, and the glare problem was eased obviously. Accordingly, an healthy, safe and environment benign LED lighting source was successfully proposed in this study.

摘 要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vii
表目錄 x
第一章 研究動機 1
第二章 相關原理之介紹 5
2.1前言 5
2.2 LED之介紹 5
2.2.1 LED歷史 5
2.2.2 LED發光原理 7
2.2.3 白光LED 10
2.3 螢光粉 15
2.4 光觸媒 17
2.5 LED的相關演色參數之介紹 19
2.5.1色座標圖 19
2.5.2色溫與相關色溫 22
2.5.3演色性 23
2.6 小結 24
第三章 實驗架構與原理 25
3.1前言 25
3.2實驗架構 25
3.2.1光觸媒材料之特性分析 25
3.2.2白光LED之製作 31
3.2.3光觸媒塗佈 32
3.2.3 實驗樣品之量測 34
3.3小結 35
第四章 實驗結果與討論 36
4.1前言 36
4.2光觸媒之材料特性分析 36
4.2.1 超音波合成法之氧化鉍 36
4.2.2 噴霧熱解法之氧化鉍 39
4.3 白光LED結合氧化鉍之實驗結果 43
4.3.1 直接塗佈氧化鉍於白光LED表面 45
4.3.2 網印法塗佈氧化鉍於玻璃基材上 49
4.4討論 54
4.5小結 57
第五章 結論 58
參考文獻 61

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