Abstract
We report on synthesis of photo-crosslinkable and photo-bleachable azobenzene based polymer and a facile process for enhancement of light extraction in organic light emitting diodes (OLEDs) using azobenzene surface relief gratings (SRGs). The crosslinked and bleached azobenzene SRGs were achieved using a two-step photo-induced fabrication process. The bleached azobenzene SRGs showed improvement in transmittance in the visible region compared with unbleached azobenzene SRGs. The SRGs were applied to OLEDs based on tris(8-hydroxyquinoline)aluminum(III) (Alq3) and poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV). As a result, the luminance of both OLEDs was increased by 18% through the use of transparent SRGs.
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