Enhancing the light extraction efficiency of AlInN nanowire ultraviolet light-emitting diodes with photonic crystal structures

In this paper, AlInN nanowire ultraviolet light-emitting diodes (LEDs) with emission at similar to 299 nm have been successfully demonstrated. We have further studied the light extraction properties of these nanowire LEDs using photonic crystal structures with square and hexagonal lattices of nanowires. The light extraction efficiency (LEE) of the periodic nanowire LED arrays was found to be significantly increased as compared to random nanowire LEDs. The LEEs reach similar to 56%, and similar to 63% for the square and hexagonal photonic crystal-based nanowire structures, respectively. Moreover, highly transverse-magnetic polarized emission was observed with dominant vertical light emission for the A1InN nanowire ultraviolet LEDs. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement