title: Insertion of two-dimensional photonic crystal pattern on p-GaN layer of GaN-based light-emitting diodes using bi-layer nanoimprint lithography.
abstract: Nanoimprint lithography (NIL) was adapted to fabricate two-dimensional (2-D) photonic crystal (PC) pattern on the p-GaN layer of InGaN/GaN multi quantum well light-emitting diodes (LEDs) structure to improve the light extraction efficiency. For the uniform transfer of the PC pattern, a bi-layer imprinting method with liquid phase resin was used. The p-GaN layer was patterned with a periodic array of holes by an inductively coupled plasma etching process, based on SiCl4/Ar plasmas. As a result, 2-D photonic crystal patterns with 144 nm, 200 nm and 347 nm diameter holes were uniformly formed on the p-GaN layer and the photoluminescence (PL) intensity of each patterned LED samples was increased by more than 2.6 times, as compared to that of the un-patterned LED sample.
authors.affiliation: Department of Materials Science and Engineering, Korea University, 1, 5ka, Anam-dong, Sungbuk-ku, Seoul 136-701, Korea.
authors.forename: Kyeong-Jae
authors.initials: KJ
authors.lastname: Byeon
authors.forename: Seon-Yong
authors.initials: SY
authors.lastname: Hwang
authors.forename: Chang-Hee
authors.initials: CH
authors.lastname: Hong
authors.forename: Jong Hyeob
authors.initials: JH
authors.lastname: Baek
authors.forename: Heon
authors.initials: H
authors.lastname: Lee