Search

Er3+-doped glass based on TiO 2 –GeO 2 –BaO–Ga 2 O 3 has been examined for mid-IR luminescence applications. Mid-IR luminescence corresponding to the 4I 11/2 → 4I 13/2 transition of Er3+ is enhanced in the presence of TiO 2. These effects are stronger for mid-IR emission at 2727 nm than near-IR emission at 1533 nm related to the 4I 13/2 → 4I 15/2 transition of Er3+. The gain bandwidth for the 4I 11/2 → 4I 13/2 transition of Er3+ is relatively large (σ em × FWHM = 8.14 × 10−26cm3), which imply that glass with TiO 2 might be a promising candidate for efficient sources emitting mid-IR radiation. • Titanate-germanate glass doped with Er3+ has been studied for mid-IR emission. • Mid-IR luminescence at 2700 nm is enhanced significantly in the presence of TiO 2. • The relatively large gain bandwidth for the 4I 11/2 → 4I 13/2 transition of Er3+ is observed. [ABSTRACT FROM AUTHOR]

[Display omitted] • The physicochemical and optical properties of TiO 2 -modified barium gallo-germanate glasses co-doped with Er3+ and Yb3+ were characterized. • The near-IR luminescence at 1.5 μm (Er3+: 4I 13/2 → 4I 15/2) is enhanced significantly in the TiO 2 -GeO 2 -BaO-Ga 2 O 3 system. • Based on the lifetime values, the energy transfer efficiencies were estimated. • The effect of pair Yb3+/Er3+ was verified by the Stark splitting observed for hypersensitive Er3+:4I 15/2 → 2H 11/2 transition. • XRD analysis confirmed the presence of crystalline phases in the highly Yb3+ and Er3+ co-doped titanate-germanate samples with Yb 2 Ti 2 O 7 and Er 2 Ti 2 O 7 phases. This work combines photoluminescence methods, Raman spectroscopy, and X-ray diffraction (XRD) to expand the knowledge of the effects of pair rare earth ions doping on the physicochemical and near-IR properties of glasses. For this purpose, glass systems based on GeO 2 -BaO-Ga 2 O 3 (GBG) and TiO 2 -GeO 2 -BaO-Ga 2 O 3 (TGBG) doped with Er3+ ions (0.1, 0.25, 0.5 mol%) and Yb3+ ions (0.5, 1.25, 2.5 mol%) were synthesized and analyzed. The near-IR luminescence band corresponding to Er3+:4I 13/2 → 4I 15/2 is narrowed for germanate-based glasses (FWHM = 31 nm), whereas in the presence of TiO 2 is more intense and broadened (FWHM = 65 nm). The energy transfer efficiencies between Yb3+ and Er3+ ions in glass samples have been calculated. Notably, the absorption spectra showed the Stark splitting for the band due to the 4I 15/2 → 2H 11/2 hypersensitive transition. Finally, we find the formation of Er 2 Ti 2 O 7 and Yb 2 Ti 2 O 7 crystalline phases in highly doping titanate-germanate samples. The results provide valuable ideas to evaluate the effect of the rare earths doping procedure on properties of designed glasses for near-IR luminescence applications. [ABSTRACT FROM AUTHOR]