2.7 µm band enhancement induced by energy transfer in Er3+/Tm3+ co-doped tellurite glass

In this work, the improvement of 2.7 µm band mid-infrared fluorescence of E r 3 + was investigated. When 0.6 mol% T m 2 O 3 was incorporated into the tellurite glass doped with 0.5 mol% E r 2 O 3 , the 2.7 µm band fluorescence originating from the E r 3 + : 4 I 11 / 2 → 4 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 T m 3 + and E r 3 + ions. The energy transfer mechanism was investigated quantitatively by calculating the microparameters and phonon contributions. The obtained result indicated that E r 3 + / T m 3 + co-doped tellurite glass is a promising candidate applied for 2.7 µm band optoelectronic devices.