Upon 808 nm excitation, an intense broadband near-infrared emission from ${\mathrm{Cr}}^{4+}$ has been observed in $80{\mathrm{GeS}}_2\text{-}20{\mathrm{Ga}}_2{\mathrm{S}}_3$ chalcogenide glass-ceramics (GCs) containing ${\mathrm{Ga}}_2{\mathrm{S}}_3$ nanocrystals. The emission band peaking at 1250 nm covers the O, E, S bands (1000–1500 nm). The formation of ${\mathrm{Ga}}_2{\mathrm{S}}_3$ nanocrystals ($\sim 20\mathrm{nm}$) increases the emission intensity of ${\mathrm{Cr}}^{4+}$ by more than three times. The quantum efficiency of the present GCs is as great as 36% at room temperature.

© 2012 Optical Society of America

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