於發光元件製備NiFe奈米結構增益出光效率之研究

Enhanced light extraction by NiFe nanostructures for optoelectronic device

洪子承(Tzu-Chen Hung)

指導教授 ： 林鴻明

大同大學/工程學院/材料工程學系所/碩士(2010年)

摘要

為了在低消耗功率方式和長壽命的薄膜顯示器達成高效益的發光效率，已經有許多方式被研發出來。許多方式包括使表面粗糙化、或是使表面結構化、甚至是梯型結構、稜鏡結構、使用反射層。此外在二維的光子晶體中的確可以在垂直的表面增強光的出光效益，是因為粗糙化的表面會減少內部的光反射，同時被困在發光元件的同調散射光也會被汲取出來，近年來，在LED的元件中添增一層介電層也能有效的增強外部量子效益。
在本研究中，利用聚苯乙烯（polystrene，PS）奈米球旋鍍在ITO/glass上，並且配合反應式離子蝕刻進行減徑，並將蝕刻完之奈米球當作遮罩，進行磁性的奈米結構陣列製備，此種結構可以藉由將表面粗糙化將在元件中因為波導效應而被困住的光子給汲取至空氣中，藉此達到增加外部量子效益的增益，同時由於其磁性結構的製備
和純薄膜相比可以藉由孔洞的大小對磁矩產生釘札效應，致使矯頑磁力(HC)變大。

關鍵字

奈米球微影術 ； 光子晶體 ； 外部量子效益 ； 金屬網狀結構

並列摘要

In order to achieve high luminous efficiency of thin-film display device, many works have been made to enhance the performance of display device due to the consideration of low power consumption and long operational lifetime. Many methods include introducing rough or textured surfaces, mesa structures and lenses, and the use of reflecting surfaces or distributed Bragg reflectors . Furthermore, it has been shown that two dimensional photonic crystals enhance the out-coupling of light along the surface normal, which is due to the roughened surface reduces internal light reflection and scatters the light outward due to the coherent scattering of the internally trapped light. Recently, the introduction of a dielectric layer into device was also reported to enhance the external quantum efficiency of LED .
In order to further improve the external quantum efficiency from LED, one has to find ways to increase the light extraction efficiency because of the concept that photons generated and with multiple opportunities to find the escape cone to enhance light-extraction ability. In this work, we report on the improved light extraction and electrical performance of the ITO/glass based substrates using magnetic nanostructure pattern made as a scattering medium for the light extraction from wave guiding to air modes of the device.

並列關鍵字

nanosphere lithography ； rough surface ； external quantum efficiency ； honeycomb Structure

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