title: Solution-processed photonic crystals to enhance the light outcoupling efficiency of organic light-emitting diodes.
abstract: We report an effective solution process to fabricate planarized photonic crystal substrates to enhance the outcoupling efficiency of organic light-emitting diodes (OLEDs). The photonic crystal structure was fabricated using nanoimprint lithography using a UV-curable acrylate and was planarized by using a ZnO layer formed by the solgel process. The solgel process resulted in a smooth surface, and OLEDs have been successfully integrated on the planarized photonic crystal layer with a low leakage current. The resulting light outcoupling efficiency was enhanced by 38% compared with that of conventional OLEDs, which is well matched with a theoretical prediction.
authors.affiliation: Department of Materials Science and Engineering, OLED Center, Seoul National University, Seoul 151-744, South Korea.
authors.forename: Hwan-Hee
authors.initials: HH
authors.lastname: Cho
authors.forename: Boik
authors.initials: B
authors.lastname: Park
authors.forename: Hyong-Jun
authors.initials: HJ
authors.lastname: Kim
authors.forename: Sohee
authors.initials: S
authors.lastname: Jeon
authors.forename: Jun-Ho
authors.initials: JH
authors.lastname: Jeong
authors.forename: Jang-Joo
authors.initials: JJ
authors.lastname: Kim