Breath figure pattern formation as a means to fabricate micro-structured organiclight-emitting diodes

Abstract

We demonstrate a procedure for fabricating micro-structured organic light-emittingdiodes (micro-LEDs) based on so-called breath figure (BF) pattern formation. Inthe latter process water vapour is condensed on the surface of a spread polymersolution to form droplets that close pack into ordered arrays and that transferthe BF pattern into the resulting solid thin polymer film. Here, we generate asilicone elastomer negative replica of the BF pattern and use it as a master forsolvent-assisted micro-moulding of an insulating polymer layer deposited on top of aPEDOT:PSS covered indium tin oxide (ITO)-coated glass substrate. By spin coating alight-emitting polymer blend film on top of the micro-structured insulator, weobtain micro-structured polymer LEDs with dimensions defined by the BF pattern.