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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

High tantalum oxide content in Eu3+-doped phosphate glass and glass-ceramics for photonic applications

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Marcondes, Lia Mara [1] ; Santagneli, Silvia Helena [1] ; Manzani, Danilo [2] ; Cassanjes, Fabia Castro [3] ; Batista, Gislene [3] ; Mendoza, Valentina Gacha [1] ; da Cunha, Cristiano Ramos [1] ; Poirier, Gael Yves [3] ; Nalin, Marcelo [1]
Total Authors: 9
[1] Sao Paulo State Univ UNESP, Inst Chem, Araraquara, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Chem, Sao Carlos, SP - Brazil
[3] Univ Fed Alfenas, Grp Quim Mat, Campus Pocos de Caldas, Pocos De Caldas, MG - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 842, NOV 25 2020.
Web of Science Citations: 0

Transparent Eu3+-doped tantalum phosphate glass-ceramics containing Na2Ta8O21 nanocrystals were successfully obtained by a two-step heat treatment. Structural analyses were performed using X-ray diffraction, Transmission Electron Microscopy, Nuclear Magnetic Resonance and Raman spectroscopy. Due to the high Ta/P ratio (= 2) the glass network is built from a mixed 3D PO4-TaO6 chain in which TaO6-rich regions are inserted and responsible for crystallization of an alkali tantalum oxide phase Na2Ta8O21. Eu3+ and their optical properties was used as a sensitive probe to study it site structure in the host matrix. The radiative properties of Eu3+ emission levels were predicted using the Judd-Ofelt theory. The chemical environment and local phonon energy around the rare-earth ions have been proposed based on phonon side band associated with the F-7(0)-> D-5(2) transition, D-5(0) -> F-7(2)/F-7(1) relative intensity and narrowing of the emission bands. High tantalum content precursor glass exhibits high photoluminescence quantum efficiency due to low phonon energy and high refractive index (1.9461 at 633 nm). A perovskite-like bronze crystalline structure is formed in the glass-ceramic (nucleated at 925 degrees C for 0.5 h and grown at 940 degrees C for different times) and is considered promising for nonlinear optical applications and studies. (C) 2020 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 18/16126-7 - Optically active glasses for photonic applications: synthesis, characterization and applications of quantum dots embedded in oxide glasses.
Grantee:Danilo Manzani
Support type: Regular Research Grants