Upconversion luminescence in erbium doped transparent oxyfluoride glass ceramics containing hexagonal NaYF4 nanocrystals

摘要

In this work transparent erbium doped oxyfluoride glass ceramics containing hexagonal NaYF4 nanocrystals has been prepared by melt-quenching and subsequent heat treatment of the precursor glass. The formation of beta-NaYF4 was confirmed by X-ray diffraction measurements. The overall intensity of the upconversion luminescence of the glass ceramics sample is 2 orders of magnitude higher than that of the precursor glass. The observed enhancement of the efficiency is explained by the incorporation of Er3+ into low-phonon beta-NaYF4 crystalline phase. (C) 2015 Elsevier Ltd. All rights reserved.