Dependence of Eu^sub 3+^ photoluminescence properties on structural transformations in diopside-based glass-ceramics

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...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-03, Vol.699, p.856
Main Authors: Allu, Amarnath R, Das, Subrata, Som, S, R Maraka, Harsha Vardhan, Balaji, Sathravada, Santos, Luis F, Manek-Hönninger, Inka, Jubera, Véronique, Ferreira, José MF
Format: Article
Language:English
Subjects:
Akermanite
Calcium magnesium silicates
Ceramic powders
Chemical bonds
Crystallization
Diffraction
Diopside
Display devices
Emission spectra
Glass ceramics
Light emitting diodes
Lighting
Optics
Photoluminescence
Powder compacts
Raman spectra
Sintering
Strontium
Transformations
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Summary: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.
ISSN:0925-8388
1873-4669