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Title: | 高光效率與高演色性發光二極體之研究 Study of Light Emitting Diodes with High Luminous Efficiency and Color Rendering Index |
Authors: | Pei-Yu Tseng 曾培瑜 |
Advisor: | 林晃巖(Hoang Yan Lin) |
Keyword: | 發光二極體,白色發光二極體,螢光粉,高演色性,高效率, Light Emitting Diodes,White-light Emitting Diodes,phosphor,high color rendering index,high luminous efficiency, |
Publication Year : | 2013 |
Degree: | 碩士 |
Abstract: | 光對人們的生活來說是不可或缺的。在照明這領域技術不斷地提升,從使用
火到現在使用燈。由於在天然能源有限的情況下,最常使用的照明設備若能更節 省能源當然是最好。於是現在更進一步地想將比一般的燈更節能的LED 使用在照 明上。 然而,LED 所產生出的白光不見得是適合使用的。發光效率與演色性對光源 而言是很重要的評斷標準。目前為了提升LED 的演色性,大多使用紅色的螢光粉 加入來補上所缺乏的發光波段。但這樣就會使其發光效率下降而違背節能的初衷。 在本論文裡建立了LED 的模型,研究各種會對其出光產生影響的變因,包括螢光 粉的濃度、膠體的厚度等。並且指出加入紅色螢光粉後所產生的再吸收現象與其 帶來功率損失的壞處。 除此之外,本論文提出一種新的膠體結構來解決再吸收的問題,當然也探討 了這些膠體結構下影響出光的變因。最後,比較新結構與傳統結構之不同。證明 在這個改良式半球結構陣列之下,的確可以提高LED 到同演色性時不讓效率下降 太多。並且在未來的研究上可以使用更多種的螢光粉來混出任何需要的顏色的 光。 Historically, light is the most important invention for human beings. From using fire to using lamps, the lighting technology is becoming more and more advanced. But the energy from earth is not unlimited. It is better to save the energy from lighting. Because LED can save more energy than the conventional lamps, it becomes a good candidate in the future lighting. But not any white light spectrum can be conducted for people. The luminous efficiency and the color rendering index are very essential for the light source. To improve the color rendering index of a LED, conventionally, the red phosphor was added into the white light LED. But it will make the luminous efficiency of LED decreased. This thesis developed the optical model and investigated the dominant factors of CRI. The controlling factors include the thickness and concentration of phosphors layer. The disadvantage caused by the phenomenon of re-absorption is also demonstrated in our model. This thesis proposed a novel structure of both silicone and phosphor and investigated the controlling factors of this new model. Obviously it can reduce the iv phenomenon of re-absorption. We proved that the new structure can increase the color rendering index of LED without decreasing the luminous efficiency. Finally, we propose using more different kinds of phosphors to generate any color of light we wish in the future work. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60788 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 光電工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-102-1.pdf Restricted Access | 11.41 MB | Adobe PDF |
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