The inkjet printed micro-rings is formed by pinned contact line which pulls the ink solution outwards to compensate solvent evaporation. This phenomena is called “coffee drop effect”, which causes uniformity problem in the inkjet printing. Our attempt is to exploit this effect for fabrication of high resolution polymer LEDs by increasing the number of pixels per unit length. Here we present fabrication of high resolution (> 200 pixels per inch) polymer LEDs using inkjet printing and reactive ion etching. We also show possible way of further increasing the resolution of polymer LEDs by modifying the inkjet printing dispensing parameters.
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