Organic emitting layer formation with microfluidic channel for multi-colored OLED array

This study describes a simple, and a low-cost method for pattering organic light emitting diodes (OLEDs) on substrates using poly-dimethylsiloxane (PDMS) microfluidic channels. We simply introduced solutions of organic emitting polymer into the microfluidic channel, and successfully coated the organic emitting polymers on the hole transport layers on electrodes. Different type of organic emitting polymers can be patterned in the same plane since the PDMS microfluidic channel has some independent flow paths for the different solutions of organic emitting polymers. Hence, each pattern emits light with different colors when voltage is applied through metal layers as electrodes. This method will be applicable for a rapid fabrication of a multi-colored OLED array.