Broadband and omnidirectional light harvesting enhancement of fluorescent SiC

Yiyu Ou, Valdas Jokubavicius, Philip Hens, Michl Kaiser, Peter Wellmann, Rositza Yakimova, Mikael Syvajarvi, Haiyan Ou

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Abstract

In the present work, antireflective sub-wavelength structures have been fabricated on fluorescent 6H-SiC to enhance the white light extraction efficiency by using the reactive-ion etching method. Broadband and omnidirectional antireflection characteristics show that 6H-SiC with antireflective sub-wavelength structures suppress the average surface reflection significantly from 20.5% to 1.01% over a wide spectral range of 390-784 nm. The luminescence intensity of the fluorescent 6H-SiC could be enhanced in the whole emission angle range. It maintains an enhancement larger than 91% up to the incident angle of 70 degrees, while the largest enhancement of 115.4% could be obtained at 16 degrees. The antireflective sub-wavelength structures on fluorescent 6H-SiC could also preserve the luminescence spectral profile at a large emission angle by eliminating the Fabry-Perot microcavity interference effect.
Original languageEnglish
JournalOptics Express
Volume20
Issue number7
Pages (from-to)7575-7579
ISSN1094-4087
DOIs
Publication statusPublished - 2012

Bibliographical note

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-20-7-7575. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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