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

2020; Elsevier BV; Volume: 547; Linguagem: Inglês

10.1016/j.jnoncrysol.2020.120307

1873-4812

Maiara Mitiko Taniguchi, Edenilson da Silva, Marco Aurélio Toledo da Silva, Leandro S. Herculano, Robson Ferrari Muniz, Marcelo Sandrini, Marcos Paulo Belançon,

Mineralogy and Gemology Studies

Emerging technologies are demanding innovative properties of glasses. In this work Cerium Oxide is used as 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 an strong redshift induced by the dopant is attributed to charge transfers O2−→Ce4+, while the 4f-5d transition of Ce3+ could not be identified in absorption or luminescence measurements. Yellow/red (570/650 nm) emission under 410/450 nm pumping were observed and are originated from Te4+ 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.