title: Variable-color light-emitting diodes using GaN microdonut arrays.
abstract: Microdonut-shaped GaN/Inx Ga1-x N light-emitting diode (LED) microarrays are fabricated for variable-color emitters. The figure shows clearly donut-shaped light emission from all the individual microdonut LEDs. Furthermore, microdonut LEDs exhibit spatially-resolved blue and green EL colors, which can be tuned by either controlling the external bias voltage or changing the size of the microdonut LED.
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea.
authors.forename: Youngbin
authors.initials: Y
authors.lastname: Tchoe
authors.forename: Janghyun
authors.initials: J
authors.lastname: Jo
authors.forename: Miyoung
authors.initials: M
authors.lastname: Kim
authors.forename: Jaehyuk
authors.initials: J
authors.lastname: Heo
authors.forename: Geonwook
authors.initials: G
authors.lastname: Yoo
authors.forename: Cheolsoo
authors.initials: C
authors.lastname: Sone
authors.forename: Gyu-Chul
authors.initials: GC
authors.lastname: Yi
keywords: and indium gallium nitride; light-emitting diodes; multicolor; nanostructure; quantum well