Luminescence of Yb2+, Yb3+ co-doped silica glass for white light source

Abstract

Yb2+, Yb3+ co-doped silica glasses were prepared by solid state reaction under vacuum condition for the first time. The luminescence properties of Yb2+-doped silica glass were investigated. There are four strong absorption bands in the Ultraviolet (UV) light region due to the 4f14–4f135d1 transition of the Yb2+ ions. The main emission wavelength of the Yb2+-doped silica glass was around 530nm by the excited wavelength of 398nm. The full width at half maximum (FWHM) of the excitation and emission bands were 137nm, 165nm respectively. The results suggest the Yb2+-doped silica glasses may be the potential medium for white light sources based on near UV LED chip.