Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/11350
標題: 使用銀奈米顆粒提升發光二極體光萃取效率之研究
Enhanced LED Light Extraction Efficiency Using Ag Nanoparticles
作者: 宗成聖
Tsung, Cheng-Sheng
關鍵字: 表面電漿
Surface Plasmon
外部量子效益
發光二極體
氮化鎵
External Quantum Efficiency
LED
GaN
出版社: 材料科學與工程學系所
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摘要: 隨著時代環境的變遷,能源使用效率及經濟效益等議題已成為目前全球最關心的問題。在本研究中,我們嘗試利用表面電漿(Surface Plasmon, SP)作用提升發光二極體(Light-Emitting Diode,LED)之光萃取效率(Light Extraction Efficiency,LEE),藉以增益發光二極體外部量子效益(External Quantum Efficiency,EQE)。論文中主要以水平式藍光發光二極體元件製程為研究方向,利用表面電漿電磁耦(Surface Plasma Polariton,SPP)與區域性表面電漿(Localized Surface Plasmon,LSP)機制,以提升發光二極體元件之出光效益。其中,利用奈米結構的銀顆粒,在適當參數條件下,堆疊形成奈米銀顆粒薄膜於p型之氮化鎵磊晶層與玻璃基板上,組成有限厚度金屬薄膜之表面電漿模態,並自然形成金屬表面光柵結構以加強表面電漿耦合作用,再以電子束蒸鍍法蒸鍍銦錫氧化物(Indium Tin Oxide ; ITO)透明導電薄膜(厚度為200nm)於銀奈米顆粒薄膜上,使整體結構經退火後可強化其光電特性,同時增益表面電漿作用與添加些微粗化效果。經測試後,奈米銀顆粒薄膜於玻璃基板時,樣品保有80%~90%的穿透率,且兼具表面電漿作用;若樣品蒸鍍200nm銦錫氧化物薄膜後退火,可再提升表面電漿作用。若將此模型應用於傳統水平式藍光發光二極體製程中,增加發光效率可達90~110%,且元件仍保有良好之電特性效果。
As time goes by, the energy efficiency and economic benefit have become a famous issue. In this thesis, a surface-plasmon-enhanced LED was successfully fabricated by improving the external quantum efficiency via the increase of light extraction efficiency of the device. It was found that the light extraction efficiency of lateral conducting blue LED can be enhanced by using surface plasmon polariton(SPP)and localized surface plasmon(LSP). With a silver nanoparticle layer deposited on p-GaN layer, a metallic thin film as the grating structure increases the out-coupling efficiency during the SPP excitation. Subsequently, electron-beam evaporated 200-nm-thick indium tin oxide(ITO) as an ohmic contact layer with rough surface was deposited on a silver nanoparticle layer using a thermal annealing process. With a comparison of the optical performance of the conventional LED without the silver nanoparticles, we confirm the superior performance of these surface-plasmon-enhanced LED. It exhibited over 1.1 times output power increase than that of the conventional LED at 350 mA and the good current-voltage characteristic as well as the conventional LED. Especially, the transmittance of silver nanoparticles on the glass substrates is higher than 80%, indicating that the increase in output power intensity is not due to the reflection of light by a silver nanoparticle layer.
URI: http://hdl.handle.net/11455/11350
其他識別: U0005-2808201322000400
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2808201322000400
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