Spectroscopic investigations of Nd3+-, Er3+-, Er3+/Yb3+-, and Tm3+-ions doped SiO2–Al2O3–CaF2–GdF3 glasses

Role of Al2O3 in upconversion and NIR emission in Tm3+ and Er3+ codoped calcium fluoro phosphorous silicate glass system

“…These changes may have strong bearing on various luminescence transitions and the energy transfer mechanism of rare earth ions in the glass network. The energy transfer mechanism between Er 3 þ and Tm 3 þ , and the process of upconversion have been reported earlier in a number of other glass systems [4,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. However, reports on the changes in the energy transfer mechanism between rare earth ions in the context of deviations in the coordination of rare earth ions (due to the variation in the concentrations of constituents of the glass matrix, especially, alumino phosphorous silicate glasses), to the best of our knowledge, are not available in the literature.…”

Spectroscopic Properties and Energy Transfer in Lead Bismuth Gallium Borate Glasses Codoped with Tm3+ and Yb3+

“…The spectra exhibits an absorption band at 980 nm due to 2 F7/2 → 2 F5/2 transition of Yb 3+ ions. The other absorption bands at 658 nm ( 3 H6 → 3 F2), 686 nm ( 3 H6 → 3 F3), 792 nm ( 3 H6 → 3 H4), 1211 nm ( 3 H6 → 3 H5) and 1663 nm ( 3 H6 → 3 F4) are attributed to 4f-4f transitions of Tm 3+ ions, respectively [22][23][24]. Assignments to the various observed bands made by comparing their band positions with the previously reported transitions of Tm 3+ ions in other glass systems.…”

Structural and spectroscopic behavior of Er3+/Yb3+ co-doped boro-tellurite glasses

“…The experimental oscillator strengths (f exp ) corresponding to the f-f induced electric-dipole transition of each band has been determined from the area under the absorption band using the below given expression [40] f…”