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[International Journal] Soft Fabric-Based Flexible Organic Light Emitting Diodes
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Woohyun Kim , Seonil Kwon , Sung-Min Lee , Jinyoung Kim , Yun cheol Han , Eungtaek Kim and Kyung Che
Organic Electronics, November , 2013
vol 14, no 10, pp 3007-3013
We reported the first organic light-emitting diodes (OLEDs) on actual soft fabrics that can be used for a wearable display. Polyurethane (PU) and poly(vinyl alcohol) (PVA) layers, which only degrade slightly the flex stiffness of bare fabrics due to their ductile characteristics, were used as planarization layers via a simple fabrication process involving lamination and spin-coating. Therefore, many of the mechanical characteristics of the bare fabric substrates were retained in the planarized fabric substrates. Non-inverted top-emitting OLEDs, designed by considering the optical microcavity effects, were fabricated on a planarized surface by thermal evaporation. The fabricated OLEDs on soft fabrics showed a high current efficiency of around 8 cd/A, reliability during a 1000 cycle bending test with a bending radius of 5 mm, and clear green emission up to an emission angle of 70°. Consequently, we developed high-performance OLEDs on very similar to real fabric via a simple universalized fabrication method.