Abstract

In this work, the improvement of 2.7 µm band mid-infrared fluorescence of ${{\rm Er}^{3 +}}$ was investigated. When 0.6 mol% ${{\rm Tm}_2}{{\rm O}_3}$ was incorporated into the tellurite glass doped with 0.5 mol% ${{\rm Er}_2}{{\rm O}_3}$, the 2.7 µm band fluorescence originating from the ${{\rm Er}^{3 +}}:{^4{\rm I}_{11/2}}\to {^4{\rm I}_{13/2}}$ transition underwent significant enhancement up to 2.3 times under the excitation of an 808 nm laser diode. This enhancement was attributed to the energy transfers between ${{\rm Tm}^{3 +}}$ and ${{\rm Er}^{3 +}}$ ions. The energy transfer mechanism was investigated quantitatively by calculating the microparameters and phonon contributions. The obtained result indicated that ${{\rm Er}^{3 +}}/{{\rm Tm}^{3 +}}$ co-doped tellurite glass is a promising candidate applied for 2.7 µm band optoelectronic devices.

© 2021 Optical Society of America

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