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URN etd-0811109-152902 Statistics This thesis had been viewed 3283 times. Download 2167 times. Author Kai-Yu Peng Author's Email Address No Public. Department Materials Engineering Year 2008 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 110 Title Enhanced Light Extraction Efficiency of Light-Emitting Devices by Ag Nanostructures Keyword metallic network nanostructures brightness enhancement film external quantum efficiency photonic crystal nanosphere lithography organic light-emitting devices organic light-emitting devices nanosphere lithography photonic crystal external quantum efficiency brightness enhancement film metallic network nanostructures Abstract Organic light-emitting devices (OLED) has become an oncoming flat panel industry in recent years, and the key issue is to promote the luminous efficiency of the devices. In fact, only a small fraction (20%) of the total ptotons generated inside the OLED are generally useable, how to extract the photons from the OLED is an important topic nowadays. Two-dimensional photonic crystal (PC) structures are fabricated by using NSL technique in this study, and the two-dimensional photonic crystal structures is acted as a scattering medium to extract the light to the outer medium efficiency, in order to enhance the external quantum efficiency of the OLED.
A large area (PET) substrate contained single-layer polystyrene nanosphere arrays with hexagonal close-packed structures, and then attached it on OLED acted as a brightness enhancement film to enhance the luminance of the devices. On the other hand, using the NSL as a template combined with the reactive ion etching (RIE) and thin film deposition techniques to fabricate metallic network nanostructures with different sizes and thicknesses on ITO/glass substrates. The out-coupling of light could be enhanced due to the roughened surface reduces internal light reflection and scatters the light outward caused the coherent scattering of the internally trapped light.
Advisor Committee Jiann-Kuo Wu - advisor
Yeong-Der Yao - advisor
Da-Hua Wei - co-chair
Files Date of Defense 2009-07-15 Date of Submission 2009-08-11