"S. M. Jeong,F. Araoka,Y. Machida,K. Ishikawa,H. Takezoe","Enhancement of normally-directed light outcoupling from organic light-emitting diodes using nano-imprinted low-refractive-index layer",,"Appl. Phys. Lett.",,"Vol. 92",,"pp. 083307-083309",2008,June "S. M. Jeong,F. Araoka,Y. Machida,Y. Takanishi,K. Ishikawa,H. Takezoe","Enhancement of Light Extraction from Organic Light-Emitting Diodes with Two-Dimensional Hexagonally Nano-Imprinted Periodic Structures Using Sequential Surface Relief Grating",,"Jpn. J. Appl. Phys.",,"Vol. 47",,"pp. 4566-4571",2008,June