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Title: Synthesis and optical properties of a lithium niobiosilicate glass doped with europium
Author: Graça, M.P.F.
Valente, M.A.
Silva, C.C.
Peres, M.
Cruz, A.
Soares, M.J.
Neves, A.J.
Monteiro, T.
Keywords: Lithium niobate
Europium niobate
Structural properties
Morphological properties
Optical properties
Issue Date: 30-Apr-2009
Publisher: Elsevier
Abstract: The sol–gel method was used to prepare a lithium niobiosilicate glass doped with europium ions, 91SiO2–4Li2O–4Nb2O5–1Eu2O3 (% mole). The dried gel was heat-treated between 500 °C and 750 °C and glass ceramics were obtained. X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman studies show that crystallization starts at temperatures above 600 °C. The LiNbO3 and EuNbO4 nanocrystals were found in the heat-treated samples as corroborated by the structural, morphological and optical properties. Room temperature photoluminescence (PL) studies allow us the identification of multiple Eu-related optical centres and the strongest red 5D0 → 7F2 intraionic transitions occur in the samples heat-treated at 600 °C where the LiNbO3 crystal phase was detected.
Peer review: yes
DOI: 10.1016/j.msec.2008.07.031
ISSN: 0928-4931
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