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URN etd-0708110-095427 Statistics This thesis had been viewed 2812 times. Download 1470 times. Author Tzu-Chen Hung Author's Email Address email@example.com Department Materials Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 104 Title Enhanced light extraction by NiFe nanostructures for optoelectronic device Keyword honeycomb Structure external quantum efficiency rough surface nanosphere lithography nanosphere lithography rough surface external quantum efficiency honeycomb Structure Abstract 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.
Advisor Committee Hong-Ming Lin - advisor
Da-Hua Wei - co-chair
Yeong-Der yao - co-chair
Files Date of Defense 2010-06-30 Date of Submission 2010-07-09