Blue and NIR emission from nanostructured Tm³⁺/  Yb³⁺co-doped SiO₂–Ta₂O₅for photonic applications

Phase-sensitive radioluminescence and photoluminescence features in Tm3+-doped yttrium tantalates for cyan and white light generation

“…Furthermore, bands located at 358, 461, and 682 nm emerged for the emission at 789 nm excitation, ascribed to the Tm 3+ f–f transitions 3 H 6 → 1 D 2 , 3 H 6 → 1 G 4 , and 3 H 6 → 3 F 3,2 , respectively. 61,62…”

“…Furthermore, bands located at 358, 461, and 682 nm emerged for the emission at 789 nm excitation, ascribed to the Tm 3+ f-f transitions 3 H 6 → 1 D 2 , 3 H 6 → 1 G 4 , and 3 H 6 → 3 F 3,2 , respectively. 61,62 The CT band intensity and position depend on two variable parameters: (i) the crystalline structure composition in each sample and (ii) the RE 3+ dopant ion. The CT band position changes toward a lower wavelength when the annealing temperature increased from 900 to 1100 °C.…”

Super Broadband at Telecom Wavelengths From RE3+-Doped SiO2-Ta2O5 Glass Ceramics Planar Waveguides

“…The use of several RE 3+ dopants in waveguide materials proposes the widest gain amplification spectrum, increasing the transmission capacity of them. Thulium (Tm 3+ ) doped amplifiers can operate in the S-band (1460–1530 nm), as well in the region from 1.2 to 2 μm, increasing the transmission via shifting away from the third telecommunication window ( Muscelli et al, 2016 ; Aquino et al, 2018 ; Khamis and Ennser, 2019 ). Neodymium (Nd 3+ ) single doped materials show one near-infrared band emission at 1.3 µm, which is placed in the O- and E-bands ( Herrera et al, 2021 ; Xia et al, 2021 ).…”

“…Among the potential RE doped matrices for telecommunication, tantalum oxide (Ta 2 O 5 ) has attractive properties like low phonon energy (<700 cm −1 ), transparency over a wide spectral range from visible to NIR regions, high refractive index (n ∼ 2.15), chemical stability ( Muscelli et al, 2016 ). Previous studies published by some of the authors have revealed that Er 3+ doped SiO 2 -Ta 2 O 5 glass ceramics can be potentially used in EDWA and WDM devices ( Ferrari et al, 2010 ), showing NIR emission with bandwidth values from 65 to 91 nm, indicating that Er 3+ ions are preferentially placed in the Ta 2 O 5 sites due to the complex structure of Ta 2 O 5 ( Ferrari et al, 2011a ).…”