Allu, Amarnath R and Das, Subrata and Som, S and Maraka, Harsha Vardhan R and Balaji, S and Santos, Luis F and Manek-Honninger, Inka and Jubera, Veronique and Ferreira, Jose M F (2017) Dependence Dependence of Eu3+ photoluminescence properties on structural transformations in diopside-based glass-ceramics. Journal of Alloys and Compounds, 699. pp. 856-865. ISSN 0925-8388

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Herein, diopside based glass-ceramics (GCs) were produced by sintering of glass powder compacts at 850 degrees C for 300 h. A special attention was paid on understanding the influence of structural transformations upon substituting strontium for calcium on the Eu3+ emission behavior. X-ray diffraction and Raman spectra showed the formation of diopside (CaMgSi2O6) in Sr-free glasses. Introduction of Sr led to the appearance of Sr-akermanite (Sr2MgSi2O2), whose formation increased continuously with increasing Sr/Ca ratio. The photoluminescence spectra exhibited intense D-5(0) -> (7)Ej transitions of Eu3+ ions. The intensity parameters (Omega(2) and Omega(4)) and the Eu-O ligand behavior were determined using the Judd-Ofelt (JO) theory from the emission spectra as a function of various Sr concentrations. The as obtained JO intensity parameters Omega(2) (5.31-5.21 pm(2)) and Omega(4) (4.89-5.84 pm(2)) indicated the ligand behavior of the Eu-O bonds and a high asymmetrical and covalent environment around Eu3+ ions in the present host matrix. In comparison with other Eu3+-doped GCs, diopside based GCs containing high fraction of SrO exhibited adequate photoluminescence for optical lighting and display devices. (C) 2017 Elsevier B.V. All rights reserved.

Item Type: Article
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 18 Jan 2018 10:40
Last Modified: 18 Jan 2018 10:40

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