Abstract
Cr 4+-doped transparent glass–ceramics containing Li 4SiO 4 nanocrystals were prepared by heat-treatment on as-made glasses. It was confirmed from absorption spectra that the energy levels of Cr 4+-doped the glass–ceramics is close to the cross point 1E and 3T states. The broadband infrared emission centered at 1230 nm with the full width at half maximum (FWHM) of more than 240 nm was observed by exciting the glass–ceramics with excitation of an 808 nm laser diode. The lifetime was about 230 μs at room temperature. The observed infrared emission could be attributed to Cr 4+ ions at low-field sites in Li 4SiO 4 glass–ceramics.
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