ALLU, Amarnath R.; DAS, Subrata; SOM, S.; MARAKA, Harsha Vardhan R.; BALAJI, Sathravada; SANTOS, Luis F.; MANEK-HÖNNINGER, Inka; JUBERA, Veronique; FERREIRA, José M.F.

doi:10.1016/j.jallcom.2016.12.438

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Licence d’utilisation du document

ALLU, Amarnath R.
Centre d'Etudes Lasers Intenses et Applications [CELIA]
Glass Science and Technology Section
Department of Materials and Ceramics Engineering

DAS, Subrata
Department of Chemical Engineering

SOM, S.
Department of Chemical Engineering

Langue

Article de revue

Ce document a été publié dans

Journal of Alloys and Compounds. 2017, vol. 699, p. 856-865

Elsevier

Résumé en anglais

Herein, diopside based glass-ceramics (GCs) were produced by sintering of glass powder compacts at 850 °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 (Sr2MgSi2O7), whose formation increased continuously with increasing Sr/Ca ratio. The photoluminescence spectra exhibited intense 5D0 →7Fj transitions of Eu3+ ions. The intensity parameters (Ω2 and Ω4) 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 Ω2 (5.31–5.21 pm2) and Ω4 (4.89–5.84 pm2) 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.< Réduire

Mots clés en anglais

Diposide

Akermanite

Photoluminescence

Quantum efficiency

DOI

http://dx.doi.org/10.1016/j.jallcom.2016.12.438

Project ANR

Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026