2016-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/702427摘要：近二十年來，由於長晶與製程技術提升，基於寬能隙氮化鎵材料的發光二極體已成為發展固態白光照明的要角。然而此種發光二極體之高效率只存在於低注入電流(亦即低亮度)的條件下。一旦為提高亮度而加大注入電流，其發光效率便隨之下降。此種發光效率隨注入電流加大而下降之現象稱為效率下降。因此探討效率下降之成因與如何減輕此效應，近年來遂成為學術界與產業界的重要研究課題。本計畫擬用理論方式探討如何藉表面電漿子耦合以減少發光二極體之效率下降。主要的研究課題包括：載子濃度變率方程之建立、金屬奈米結構對發光二極體效率下降影響之數值計算、表面電漿子耦合對發光二極體效率下降影響之探討等。本計畫的模擬結果將有助於瞭解高功率發光二極體之發光效率變化，並可供設計上參考。<br> Abstract: In recent two decades, technologies of crystal growth and device fabrication have been greatly improved and hence the GaN-based light-emitting diode (LED) has played an important role for solid-state lighting application. However, this kind of LED has high efficiency only at low injection current, i.e., at low brightness. Once the injection current is increased for higher brightness, the emission efficiency decreases. This efficiency decrease at high injection current is known as the efficiency droop. Therefore, to investigate the cause of efficiency droop as well as to reduce this effect has become an important academic and industrial research topic. In this proposal, we theoretically investigate the surface plasmon coupling for reducing the efficiency droop in an LED. Our main research topics include: establishment of the carrier concentration rate equation model, numerical calculation of the influence of metal nanostructures on the LED efficiency droop, and investigation of the influence of the surface plasmon coupling on the LED efficiency droop. The simulation results from this project will be helpful in understanding the variation of emission efficiency of a high-power LED, and also useful for designing this type of device.發光二極體效率下降表面電漿子耦合數值模擬light-emitting diodeefficiency droopsurface plasmon couplingnumerical simulation