Abstract
The near-infrared (NIR) emission and energy transfer (ET) of Pr3+–Er3+–Yb3+ tri-doped in TeO2–Nb2O5–BaO–La2O3 niobate tellurite glasses under the excitation of a 980 nm laser diode (LD) were investigated. A broadband flat NIR emission of Pr3+–Er3+–Yb3+ tri-doped was observed within the range of 1250 to 1650 nm with a full-width at half-maximum (FWHM) of about 300 nm which covered the whole O-, E-, S-, C- and (C+L)- bands. The role of Yb3+ for enhancing the intensity of NIR emissions has also been examined. Remarkably, the analysis results on the DTA curve exhibited the good thermal stability of TeO2–Nb2O5–BaO–La2O3 niobate tellurite glasses in this study with the average value of ΔT = 196°C. The GPr(λ), GEr(λ) gain coefficient spectra of Pr3+ and Er3+, respectively in the TNBL-0P0.1E0Y (Er3+-single-doping) and the TNBL-0.8P0E0Y (Pr3+-single-doping), are determined. Besides, the mechanism of ET processes between Pr3+, Er3+, and Yb3+ was proposed and discussed.
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