Investigation of the TeO2/GeO2 Ratio on the Spectroscopic Properties of Eu3+-Doped Oxide Glasses for Optical Fiber Application

Abstract

This study presented an analysis of the TeO2/GeO2 molar ratio in an oxide glass system. A family of melt-quenched glasses with the range of 0–35 mol% of GeO2 has been characterized by using DSC, Raman, MIR, refractive index, PLE, PL spectra, and time-resolved spectral measurements. The increase in the content of germanium oxide caused an increase in the transition temperature but a decrease in the refractive index. The photoluminescence spectra of europium ions were examined under the excitation of 465 nm, corresponding to 7F0 → 5D2 transition. The PSB (phonon sidebands) analysis was carried out to determine the phonon energy of the glass hosts. It was reported that the red (5D0 → 7F2) to orange (5D0 → 7F1) fluorescence intensity ratio for Eu3+ ions decreased from 4.49 (Te0Ge) to 3.33 (Te15Ge) and showed a constant increase from 4.58 (Te20Ge) to 4.88 (Te35Ge). These optical features were explained in structural studies, especially changes in the coordination of [4]Ge to [6]Ge. The most extended lifetime was reported for the Eu3+ doped glass with the highest content of GeO2. This glass was successfully used for the drawing of optical fiber.

The Effect of Fluorides (BaF2, MgF2, AlF3) on Structural and Luminescent Properties of Er3+-Doped Gallo-Germanate Glass

“…The band E (at 850 cm −1 –880 cm −1 ) can be attributed to the asymmetrical stretching vibration of the bridging oxygens (BO) from the GeO 4 tetrahedra ( [4] Ge-O- [4] Ge). The last band, F, at 950 cm −1 –1000 cm −1 ) can be related to the stretching vibration of the non-bridging oxygens (NBO) of the GeO 4 tetrahedra [ 32 , 33 , 34 , 35 , 36 ].…”

Influence of Eu3+ ions on 1.5 µm luminescence of Er3+ in TeO2–ZnO–Bi2O3 glasses

“…of dissolving significant amounts of REEs [1], which enables the preparation of glass with wide REE content and facilitates the manufacture of active elements of solid-state lasers [2], optical fibers [3], infrared (IR) sensors [4], and optical up-converters [5]. Tellurite glasses doped with Er 3+ ions are considered to be appropriate materials for the applications listed.…”

Rare Earth Doped Glasses/Ceramics: Synthesis, Structure, Properties and Their Optical Applications

“…The influence of TeO 2 /GeO 2 molar ratios on spectroscopic properties of Eu 3+ -doped oxide glasses is reported by Leśniak et al [20]. Glasses were investigated to explore their potential application as an efficient host material for rare-Earth doping and optical fiber drawing and characterized using different experimental techniques, i.e., DSC, Raman, MIR, refractive index, PLE, PL spectra and time-resolved spectral measurements.…”