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研究生:林盈君
研究生(外文):Ying-Jyun Lin
論文名稱:混合氮化物類螢光膠高演色性白光LED光學特性的探討
論文名稱(外文):A Study on Optical Properties of High Color-RenderingIndex for Nitride Phosphor Mixture in White-Light LEDs
指導教授:鄭木海
指導教授(外文):Wood-Hi Cheng
學位類別:碩士
校院名稱:國立中山大學
系所名稱:光電工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:85
中文關鍵詞:演色性氮化物螢光膠白光發光二極體
外文關鍵詞:color rendering indexwhite lighnitridephosphorLight Emitting Diode
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本論文係研究高演色性白光發光二極體之螢光膠光學性質及其可靠度測試。基於光混色原理及為達成高演色性的考量之下,選用了紅、黃與綠三種顏色的螢光粉,將其與矽膠充分混合後形成螢光膠,搭配藍色發光晶片製成白光發光二極體。三種螢光粉分屬不同類別:紅色螢光粉為氮氧化物、黃色為YAG、綠色為矽酸鹽。
於本研究中,製作兩種樣品,分別為與市售產品相同元件及單色螢光膠樣品,而元件樣品係依照嚴格的製作流程及亮度要求,製作冷白(色溫5650~7000K,發光率>70lum/W,Ra=91)與暖白(色溫2850~3250K,發光效率>50lum/W,Ra=93)兩種高演色性與極佳發光效率的元件,此結果顯示研發元件的發光效率優於文獻中所發表(發光效率=28 lum/W,Ra=95)。
在單純螢光膠樣品中,製作了三種單色膠,之後對其作可靠度測試。可靠度的試驗標準係採用與美國LED 大廠CREE 相同之規範,總共試驗三個項目,包含高溫高濕(60℃,90% 相對溼度),冷熱衝擊(-40℃~125℃)與壽命檢測(驅動電流350mA)。在紅、黃、綠螢光粉經過冷熱衝擊可靠度測試結果,其光強度衰減量分別為11.7%、17.5%及19.3%,因此紅螢光粉的熱穩定較佳。而高溫高濕可靠度測試結果,在紅、黃、綠螢光粉中,其光強度減少量分別為15.7%、10.1%及6.4%,因此綠螢光粉對水穩定性佳。在元件的壽命可靠度測試結果,冷白、暖白光強度的衰減量分別為3.2%及4.2%,因此冷白元件的壽命有較好可靠度。
This paper tries to explore the phosphor optical characteristics through reliability tests using white light emitting diodes (WLEDs) with a high color rendering index
(CRI ,Ra>90). Based on light mixing principles and considering the high CRI, three color-coded powders were mixed separately with silicone into a phosphor, and then
bottomed with blue chips into WLEDs. The three powders were oxide nitride (red), YAG (yellow), and silicate (green).
Two kinds of samples were fabricated – phosphor and emitters similar to commercial products. Both cool-white (CCT=5650~7000K, lumen efficiency>60 lum/w.) and
warm-white (CCT=2850~3250K, lumen efficiency>50 lum/w.) samples passed the Bin Code distribution process and brightness measurement. The results indicate better
lumen efficiency than previously published research.
After the three kinds of mono-colored phosphors were created, .we implemented the reliability test in which three CREE standards were chosen. These standards were (1)
high temperature with high humidity test (60℃ , 90% humidity) in operating and non-operating condition; (2) thermal shock test (-40℃ ~125℃ ); (3) life time test.
The thermal shock test showed the decaying power of intensity for red, yellow, and green phosphors were 11.7%, 17.5%, and 19.3% respectively. These results demonstrate that the red phosphor has the best thermal resistance. However, after the high temperature with high humidity tests, the decaying power of intensity for red,yellow, and green phosphor were 15.7%, 10.1% and 6.4% correspondingly. These results show that the green phosphor has best aqua resistance. In the life time test of
emitters, the decaying power of intensity for the cool-white emitter was 3.2%, while the warm-white emitter showed 4.2%. As such, cool-white emitters were concluded to
have better reliability than warm-white emitters.
中文摘要I
英文摘要II
誌謝III
內容目錄V
圖目錄VI
表目錄IX
第一章簡介
1.1 發光二極體的發展概述………………….…………1
1.2 研就動機.........………………………………………3
1.3 研究大綱…….………………………………………3
第二章基本原理
2.1 發光二極體的發光原理…….………………………5
2.2 光色度學(Photometry)
2.2.1 白光混色原理………………..……………………7
2.2.2 螢光發光理論……………..………………………8
2.2.3 色彩屬性…………..………………………………9
2.2.3.1 CIE 色座標………….…………………………10
2.2.3.2 色溫…………….………………………………10
2.3 關於演色性
2.3.1 演色性計算原理… ………………………………12
2.4 色溫與白光分級……………………………………14
第三章研究方法與流程
3.1 實驗流程圖…………………………………………25
3.2 材料準備與樣品製作………………………………26
3.3 實驗方法……………………………………………26
3.4 特性儀器介紹
3.4.1 紫外線/可見光分光光譜儀原理…………………27
3.4.2 多功能螢光分光光譜儀原理.……………………29
3.4.3 光電特性量測系統.………………………………30
3.5 可靠度測試…………………………………………30
第四章結果與討論
4.1 吸收與激發光譜……………………………………45
4.2 積分球量測與色飄移………………………………46
4.3 電性資料分析………………………………………47
第五章結論...……………………………………………69
第六章參考文獻………………………………...............74
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