Yb3+ sensitized Er3+ doped Gd2SiO5 powders prepared by combustion synthesis: Up-conversion fluorescence emission at visible from near-infrared

摘要

The up-conversion (UC) fluorescence performance of Er3+: Gd2SiO5 and Er3+: Yb3+: Gd2SiO5 powders prepared by combustion synthesis was investigated under near-infrared (lambda=975 nm) continuous wave laser excitation. The surface morphology and structure of the powders were studied with scanning electronic microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS) and X-ray powder diffraction (XRPD). UC fluorescence spectra of the samples show bands centered at similar to 525, similar to 560 and similar to 660 nm, corresponding respectively to 4f-4f transitions from upper levels H-2(11/2), S-4(3/2) and F-4(9/2) to the ground state level I-4(15/2) of Er3+. The dynamics of the UC fluorescence signal obtained in the co-doped Er3+: Yb3+: Gd2SiO5 sample was used along with a simple rate equation model for the Er3+ and Yb3+ populations to estimate the Yb3+ -> Er3+ energy transfer rates. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.