Structure and fluorescence properties of Dy‐doped alkaline‐earth borophosphate glasses
Kristin Griebenow, Francisco Muñoz, Nagia S. Tagiara, Róbert Klement, Anna Prnová, Bruno Wolfrum, E. I. Kamitsos, Alicia Durán, Dušan Galusek
Abstract
Abstract Dysprosium‐doped borophosphate glasses, containing the divalent cations Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , and Zn 2+ , are prepared by the melt‐quenching technique. The structure of the glasses is investigated by Raman, infrared, and nuclear magnetic resonance (NMR) spectroscopies and the fluorescence properties are determined. The Dy 3+ emission lifetime increases with an increasing ionic field strength and its maximum is observed in the Mg 2+ and Zn 2+ containing glasses. This result can be explained by the stronger M‐O bonding which causes a rearrangement of the borophosphate network and creates a local Dy 3+ environment of comparably low symmetry. This is in agreement with the Raman spectra and the evolution of the molar volume. The effect of the B/P variation on the emission properties of Dy 3+ is investigated in a second series of glasses where the emission lifetime is found to be maximum at 10 mol% B 2 O 3 .