Abstract
Co2+/Er3+ co-doped transparent glass ceramic embedding spinel ZnAl2O4 and orthorhombic Y F3 nanocrystals was fabricated successfully by a conventional melt-quenching method for the first time. The sequential precipitations of ZnAl2O4 and Y F3 phases from the precursor glass are confirmed by x-ray diffraction and transmission electron microscopy. Spectroscopic results reveal that the selective incorporations of Co2+ and Er3+ ions into the ZnAl2O4 and Y F3 nanocrystals respectively are achieved, leading to complete suppression of the energy transfer between Co2+ and Er3+. The investigated glass ceramic, in which the tetrahedrally coordinated Co2+ could create saturated absorption for the Er3+ emission at 1.54 μm, might find potential application as a self-Q-switched laser material.
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