# The role of Ce$^{3+}$/Ce$^{4+}$ in the spectroscopic properties of cerium oxide doped zinc-tellurite glasses prepared under air

## TL;DR

This study investigates how cerium oxide doping affects the structural, optical, and luminescent properties of zinc-tellurite glasses, revealing charge transfer mechanisms and enhanced visible luminescence without direct involvement of cerium ions.

## Contribution

It provides new insights into the spectroscopic behavior of Ce$^{3+}$/Ce$^{4+}$ in zinc-tellurite glasses and how doping modifies their optical properties and luminescence.

## Key findings

- Cerium doping causes a strong redshift due to charge transfer.
- Luminescence enhancement is linked to glass network modifications.
- Ce ions do not directly contribute to radiative processes.

## Abstract

Emerging technologies are demanding innovative properties of glasses. In this work, Cerium Oxide is used as a dopant in Zinc-Tellurite samples and its effects on the properties of the glass are investigated. Thermal analysis and x-ray diffraction confirmed the amorphous nature of all samples. The bivalent nature of Cerium is investigated spectroscopically and a strong redshift induced by the dopant is attributed to charge transfers O$^{2-}{\rightarrow}$Ce$^{4+}$, while the 4f-5d transition of Ce$^{3+}$ could not be identified in absorption or luminescence measurements. Yellow/red (570/650 nm) emission under 405/450 nm pumping were observed and are originated from Te$^{4+}$ ions, which absorbs light in the UV/blue region of the spectrum. The incorporation of some Cerium Oxide enhanced the visible luminescence, though we found no evidence that Cerium ions play some role in the radiative process. The luminescence is enhanced though due changes in the glass network induced by the dopant.