Effect of the PVA (polyvinyl alcohol) concentration on the optical properties of Eu-doped YAG phosphors

The influence of the polyvinyl alcohol (PVA) concentration on the synthesis and structural, morphological and optical properties of Y3Al5O13: Eu (Eu-doped YAG) was systematically investigated in this work. The final concentration of PVA in the preparation step influenced the crystallite size and als...

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Bibliographic Details
Published in:Optical materials 2016-10, Vol.60, p.495-500
Main Authors: Hora, Daniela A., Andrade, Adriano B., Ferreira, Nilson S., Teixeira, Verônica C., dos S. Rezende, Marcos V.
Format: Article
Language:English
Subjects:
Eu-doped YAG
Luminescence
Phosphors
PVA based sol-gel
XEOL
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Summary:The influence of the polyvinyl alcohol (PVA) concentration on the synthesis and structural, morphological and optical properties of Y3Al5O13: Eu (Eu-doped YAG) was systematically investigated in this work. The final concentration of PVA in the preparation step influenced the crystallite size and also the degree of particle agglomeration in Eu-doped YAG phosphors. X-ray excited optical luminescence (XEOL) emission spectra results indicated typical Eu3+ emission lines and an abnormally intense 5D0 → 7F4. The intensity parameters Ω2 and Ω4 were calculated and indicated the PVA concentration affects the ratio Ω2:Ω4. X-ray absorption spectroscopy (XAS) results showed Eu valence did not change and the symmetry around the Eu3+ is influenced by the PVA concentration. XEOL-XAS showed the luminescence increases as a function of energy. [Display omitted] •The PVA concentration strongly influences the Eu-doped YAG properties.•The 5D0 → 7F4 transition appeared with an abnormally high intensity.•Eu-doped YAG can be used as red-emitting photonic source.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2016.09.011