Enhanced efficiency of organic light-emitting devices with corrugated nanostructures based on soft nano-imprinting lithography

An enhanced efficiency organic light-emitting device(OLED) with corrugatednanostructures on a small-molecule organicfilm has been demonstrated. Bypatterning the hole transport layer via soft nano-imprinting lithography and coating with Ag, a nanostructured cathode is introduced to enhance the light extraction of theOLED without affecting the flatness and conductivity of the indium-tin-oxidefilm. Both luminance and current efficiency are improved compared with those of conventional planar devices. The observable improvement in luminance and current efficiency can be ascribed to thesurface plasmonic and scattering effects caused by the Agnanostructures. Moreover, theoretical simulations also demonstrate that the power loss tosurface plasmon-polariton modes has been recovered.

Source: Applied Physics Letters - November 8, 2016 Category: Physics Authors: Yue-Feng Liu, Ming-Hui An, Xu-Lin Zhang, Yan-Gang Bi, Da Yin, Yi-Fan Zhang, Jing Feng and Hong-Bo Sun Source Type: research