title: Broadband and omnidirectional light harvesting enhancement of fluorescent SiC.
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-Pérot microcavity interference effect.
authors.affiliation: Department of Photonics Engineering, Technical University of Denmark, Lyngby DK-2800, Denmark. yiyo@fotonik.dtu.dk
authors.forename: Yiyu
authors.initials: Y
authors.lastname: Ou
authors.forename: Valdas
authors.initials: V
authors.lastname: Jokubavicius
authors.forename: Philip
authors.initials: P
authors.lastname: Hens
authors.forename: Michl
authors.initials: M
authors.lastname: Kaiser
authors.forename: Peter
authors.initials: P
authors.lastname: Wellmann
authors.forename: Rositza
authors.initials: R
authors.lastname: Yakimova
authors.forename: Mikael
authors.initials: M
authors.lastname: Syväjärvi
authors.forename: Haiyan
authors.initials: H
authors.lastname: Ou
mesh_terms: D017554:Carbon Compounds, Inorganic / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D012542:Scattering, Radiation; D017655:Silicon Compounds / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D017554:Carbon Compounds, Inorganic; D017655:Silicon Compounds; C022088:silicon carbide