Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/4079
標題: 鋱釔鋁石榴石螢光粉對白光發光二極體特性影響之研究
Effects of terbium-yttrium-aluminum garnet phosphors on luminance properties of white light LEDs
作者: 古依雯
Ku, Yi-Wen
關鍵字: phosphors
螢光粉
white light LEDs
白光發光二極體
出版社: 精密工程學系所
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摘要: 本論文是以藍光發光二極體激發與其成互補色之黃色螢光粉,並藉由色光之混合產生白光,分別改變螢光粉及藍光LED的發射波長,探討以環氧樹脂與螢光粉不同配比封裝,LED色彩所產生的影響變化趨勢,並尋找螢光粉與晶粒的最佳搭配方式。 實驗結果顯示,以波長466 nm的藍光晶片搭配發射波長552 nm的螢光粉為最佳,當環氧樹脂與螢光粉的混合重量比為30:1時,20 mA的驅動電流,其色度座標值為(0.33, 0.33),發光效率40 lm/W,演色性可達到84。但在注入較高電流時,色度座標的x、y值變小,電流慢慢提升,發光效率逐漸下降,電流提升至80 mA演色性提高到85.6。 從高溫壽命測試研究發現,單一藍光晶粒並未出現老化現象。但若封裝後經200小時亮度衰減70%,又對白光LED老化測試其衰退更嚴重,由此可知樹脂與螢光粉之熱穩定性對LED元件壽命有很明顯之影響。
In this thesis, using blue LED pumping the yellow phosphors to form white light was studied. The effects of the emission wavelength of the phosphors , blue LED on the final color coordinate were investigated. The combination of the phosphors, LED and epoxy was optimized. As the LED with wavelength 466 nm combinated with phosphors with 552 nm emission wavelength and the weight ratio of epoxy and phosphors being 30:1 , the color coordinate (0.33, 0.33), efficiency 40lm/W, Ra 84 can be obtained. But, the color coordinates x,y decrease as the LED injection current increasing. For example, Ra can be up to 85.6 as LED injection current increase to 80 mA. The trial of high temperature operating life revealed, the blue chip have not worn out. But after packaged, the blue LEDs have degraded by 70% after 200 hours operation, and the white LEDs have serious degradation. These results suggest that the heat stability of the epoxy and phosphors have very obvious effects on the LEDs life.
URI: http://hdl.handle.net/11455/4079
其他識別: U0005-0808200623434000
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0808200623434000
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