Preparation and fluorescence properties of Yb~3 and Er ~3 co-doped GdAlO_3 phosphors

摘要

Yb~3 and Er~3 co-doped GdAlO_3 phosphors are prepared by the solgel method. The effect of doping concentration on the structure and fluorescence properties is investigated by X-ray diffraction (XRD) and photoluminescence, respectively. XRD pattern indicates that the sample structure belongs to orthorhombic. The photoluminescence results show that both green and red fluorescence emission and upconversion emission intensities decrease with an increase in Yb~3 concentration due to the cross-relaxation process between Yb~3 and Er~3 ions. Based on the emission spectra, the mechanism of the upconversion emission is discussed, and we concluded that the upconversion emission is a two-photon process.