Dependence Dependence of Eu3+ photoluminescence properties on structural transformations in diopside-based glass-ceramics
authors Allu, AR; Das, S; Som, S; Maraka, HVR; Balaji, S; Santos, LF; Manek-Honninger, I; Jubera, V; Ferreira, JMF
nationality International
journal JOURNAL OF ALLOYS AND COMPOUNDS
author keywords Diposide; Akermanite; Photoluminescence; Quantum efficiency
keywords RARE-EARTH IONS; LUMINESCENCE PROPERTIES; QUANTUM EFFICIENCY; ENERGY-TRANSFER; PHOSPHORS; RED; SPECTRA; DY3+; SUBSTITUTION; FLUORESCENCE
abstract 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.
publisher ELSEVIER SCIENCE SA
issn 0925-8388
isbn 1873-4669
year published 2017
volume 699
beginning page 856
ending page 865
digital object identifier (doi) 10.1016/j.jallcom.2016.12.438
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000393727500119
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journal impact factor 3.779
5 year journal impact factor 3.315
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