Improved Light Extraction Efficiency in Organic Light-Emitting Diodes Using Phase-Separated Polymer Films
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We report high performance internal light outcoupling films based on phase-separated polymers for indium tin oxide-free organic light emitting diodes (OLEDs). The two immiscible polymers of poly(amic acid) and polyimide in a blend film result in nanoporous structures after spin-coating by self-assembly process. The phase-separated films prepared between the glass substrate and the PEDOT:PSS transparent electrode remarkably improve the outcoupling performance of OLEDs. The poly(methyl methacrylate) (PMMA)-assisted phase-separated films significantly improve the current efficiency and power efficiency of OLEDs by a factor 1.82 and 2.06, respectively, compared to the reference device without any outcoupling structure. Our results demonstrate that phase-separated films developed here offer new opportunities in improving the outcoupling efficiency in OLEDs.