Abstract
The environment of rare-earth ions in fluorozirconate-based glasses was investigated by fluorescence line narrowing spectroscopy using Eu3+ as a local site probe. A pulsed tuneable dye laser was used to excite the5D0 level of Eu3+, and the subsequent5D0 →7Fj fluorescence spectra were recorded as a function of exciting wavelength. A series of5D0 excitation spectra was also taken, the emission monitored at various positions in the fluorescence spectra. The extra features visible in some of these spectra are not due to two different site distributions as previously thought, but are an effect caused by simultaneous excitation into the5D0 phonon side band.
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