| Summary: | 碩士 === 國立東華大學 === 材料科學與工程學系 === 106 === In this thesis, manufacture of light-extraction films with highly stable CIE indices for organic light-emitting diode (OLED) was focused on. The light-extraction films were made by adding oxide nanoparticles, having a high refractive index, uniformally dispersed in the polymeric matrix. The efficiency of the OLED is increased by destroying substrate waveguide through light scattering from oxide nanoparticles with a high refractive index.
Zirconia nanoparticles, having an average size of 200 nm and irregular shape, were surface modified firstly. The modified ZrO2 nanoparticles, poly(methyl methacrylate) (PMMA), and butyl acetate (BA) were then mixed using a magnetic stirrer and a mechanical homogenizer to form a suspended solution. The solution was diluted by adding a certain amount of butyl acetate, followed by spin coating on glass substrates to form light-extraction films. In addition, duplicate of light-extraction films without zirconia nanoparticles was performed by using polydimethylsiloxane (PDMS) molding and UV forming techniques. Finally, efficiency improvement and optical properties of the OLED were investigated by attaching either light-extraction films or duplicate on the OLED.
Surface morphologies of light-extraction films and their duplicates were measured using a scanning electron microscopy (SEM). The emitting spectra, CIE indices, luminous current efficiency and power efficiency of the OLED attached with either light-extraction films or their duplicates were analyzed by using a chroma meter (CS-1000A).
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