Spectroscopic investigations on Yb3+ doped and Pr3+/Yb3+ codoped tellurite glasses for photonic applications

In this work, we report on structural and spectroscopic properties of Yb3+ doped and Pr3+/Yb3+ co-doped TeO2-Bi2O3-ZnO-Li2O-Nb2O5 (TBZLN) tellurite glasses. Bending and stretching modes of TeO2 and Te-OH bond (strong and weak) were analysed from the deconvolution of observed Raman and FT-IR spectra. Based on the absorption measurements, the energy bands of Yb3+ and Pr3+ ions are assigned. The spectroscopic properties for the radiative transitions of Yb3+ and Pr3+ ions were reported using McCumber and Judd-Ofelt theories. Visible emission bands originating from P-3(1) and P-3(0) to lower lying levels of Pr3+ were registered under 447 nm excitation. The emission band around 1334 nm assigned to the Pr-3: (1)G(4)-> H-3(5) was observed when excited at 980 nm. The stimulated emission cross-section (sigma(emi)(lambda)) and effective linewidth (Delta lambda(eff)) for the P-3(1)-> H-3(6), P-3(1)-> H-3(5), P-3(0)-> H-3(6), P-3(0)-> F-3(2), P-3(1)-> 3F3, P-3(1)-> F-3(4), P-3(0)-> F-3(4) and (1)G(4)-> H-3(5) transitions of Pr3+ are reported. Upconversion luminescence in Pr3+/Yb3+ co doped glass upon 980 nm excitation was measured. Possible resonant transfer processes between Yb3+ and Pr3+ ions are presented and discussed. The chromaticity co-ordinates were also evaluated from the visible emission spectra showing that Pr3+/Yb3+ co-doped glass may be suitable for the development of yellow-orange (lambda(exc) = 447 nm) and near white light (lambda(exc) = 980 nm) emitting devices in photonics. (C) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.

Automated summary

This work focuses on the structural and spectroscopic properties of Yb3+ doped and Pr3+/Yb3+ co-doped tellurite glasses. The Raman and FT-IR spectra were used to analyze the bending and stretching modes of TeO2 and Te-OH bonds. Energy bands and radiative transitions of Yb3+ and Pr3+ ions were assigned based on absorption measurements and theoretical models.