壓印技術製作表面微結構應用於圖樣化藍寶石基板發光二極體之研究;The research on applications of surface microstructure with imprinting technology in pattern sapphire substrate light emitting diodes

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/7072

Title:	壓印技術製作表面微結構應用於圖樣化藍寶石基板發光二極體之研究;The research on applications of surface microstructure with imprinting technology in pattern sapphire substrate light emitting diodes
Authors:	林佳裕;Jia-Yu Lin
Contributors:	光電科學研究所
Keywords:	壓印技術;圖樣化藍寶石;發光二極體;遠場光型圖;光萃取效率;LED;light extraction efficiency;far-field light pattern;imprinting technology;pattern sapphire substrate
Date:	2009-07-03
Issue Date:	2009-09-22 10:36:34 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	隨著發光二極體在生活中的應用越來越為廣泛，對於其發光效率及光源的配置就格外顯的重要。本論文最主要的目的是藉由使用圖樣化藍寶石基板 (Pattern Sapphire Substrate, PSS) 及運用壓印技術(Imprint Technology) 製作表面微結構的發光二極體，來達到對發光效率的提升與遠場光型的調制效果。我們使用四種不同結構的模具將微結構壓印於有、無圖樣化藍寶石基板之發光二極體表面上，相互作為比較，並分別進行電特性、光特性及遠場光型的量測，觀察其對發光效率及遠場光型的改變。由實驗結果顯示，有壓印微結構於發光二極體表面的電特性與無壓印微結構相較，幾乎維持一致，證實運用壓印技術配合相關製程，並不會影響電特性。在出光表現上，在20mA電流操作下，有、無圖樣化藍寶石基板之發光二極體相比較，前者可提升光強度約1.5倍；製作壓印微結構於具圖樣化藍寶石基板之發光二極體，依據所製作的圓洞 (Hole) 、金字塔 (Pyramid) 、圓錐 (Cone) 以及光柵 (Grating)四種圖形結構，與沒有壓印微結構相比較，光強度分別提升27 %、12 %、13 %及26 %。光型調制方面，由壓印結構在無圖樣化基板之發光二極體表面的遠場光型圖，可以發現依不同的幾何結構，會得到相對應的光型改變；從壓印結構於有圖樣化基板之發光二極體表面的遠場光型圖來分析，所有具有壓印結構與沒有壓印結構的光型幾乎呈現一致，可知光源調制效果會由圖樣化基板所改變的光型所主導，顯示出微結構對有圖樣化基板的發光二極體來說，對整體輸出光型的影響並不顯著。With the wide application of LED, the LED light extraction efficiency and the arrangement of the light source are important. In this thesis, the surface microstructure by Pattern Sapphire Substrate (PSS) and Imprint Technology are employed to enhance the light extraction efficiency and modulate the far-field light pattern of LEDs. There are four different configurations for imprinting the microstructure on the surfaces of the substrate with and without PSS. The electrical properties, light characteristics, and the measurement of far-field light patterns of these two substrates are used to observe the light efficiency and the variations of far-field light pattern. From the experimental results, the electrical properties of the imprinting microstructure with and without PSS are consistent, which confirms the electrical properties are not affected by LED process and the imprinting method. In the light extraction efficiency, it can enhance the light output power of PSS LEDs to 1.5 times under the current of 20mA. The LEDs with PSS are imprinted with four structures which are Hole, Pyramid, Cone, and Grating. Comparing with the conventional LED, it shows the light extraction enhancements of each structure are 27%, 12%, 13%, and 26% respectively. In the modulation of light pattern, the imprinting structure with different structures on the LED without PSS shows the correspondent far-field light patterns vary with the geometric structure types. Both of the light pattern which are with and without imprinting microstructure are consist by the analysis of the far-field light pattern of imprinted microstructure the PSS LED. It can be concluded that the effects of light pattern modulation are dominated by the microstructures on substrate of LEDs but slightly affected by the imprinted microstructure on the LED.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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