| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 101 === This study focus on, the effect of surface modification of ITO electrode with organic phosphorous acid monolayer on the device characteristics of organic light emitting diode, especially the optimizatioon of adsorption conditions, including the adsorption time, the baking time and the solvent selection. The effects of surface modification was studied based on surface analysis, device performance and lifetime measurement. The possible cause of dark spots formation on the device surface was also explored and improved.
The effects of adsorption time and the baking time of substrate indicated that a brief immersion followed by high-temperature baking is enough to achieve a saturated monolayer adsorption of organic phosphorous acid molecules. In the device lifetime measurement, a tenfold lifetime enhancement was observed for device with the modified substrate compared to standard device. Results on solvent effect show that poorer quality of monolayer formation and device characteristics were obtained as long as the substrate had been in contact with deionized water, during adsorption step or washing step. For the dark spot formation, it was found solvent sonication alone cannot remove the particles that may inadvertently adsorbe on the surface and cause dark spots. Mechanical rubbing with cotton wool can effectively remove the particles. The adsorption solution may also contain particles from the organic compound and physisorb on the substrate and lead to dark spots. This can be improved by filtration of the solution before adsorption.
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