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Optical characteristics of samarium doped ZnAl2O4 nanomaterials synthesized by vibrational milling process
Author(s)
Date Issued
January 1, 2018
Type
Conference Paper
Abstract
Optical and fluorescence properties of samarium (Sm) doped zinc aluminate host matrix (Sm:ZnAl2O4) was studied. Sm:ZnAl2O4 nanopowder was synthesized by vibrational milling process assisted with calcination treatment. Structural and optical properties of Sm:ZnAl2O4 nanopowders were investigated via the crucial parameter of different doping concentration. Structural properties of as-synthesized samples and Sm: ZnAl2O4 powders were characterized by X-ray diffraction and scanning electron microscope. For optical properties, Sm: ZnAl2O4 phosphor materials were analyzed via diffuse reflectance and photoluminescence spectroscopy. The preliminary results suggested that Sm: ZnAl2O4 powders were identically in spinel crystalline phase as host ZnAl2O4 structure affirmed by XRD result. SEM images indicated the Sm:ZnAl2O4 after the synthesis distinctly obtained in ultrafine power due to the effect of several milling round and sintering process. The optical properties in reflectance mode of Sm:ZnAl2O4 samples were significantly increased by the presence of Sm dopant in ZnAl2O4 structure. Meanwhile, the luminescent materials showed red emissions under visible light excitation in range of 650-730 nm by PL spectra. The improvement of ZnAl2O4 photoluminescence property was obviously obtained at 0.5 wt.% Sm due to photon transfer from Sm to host material.
Citation
Materials Today Proceedings, 5(6), 14126-14130, 2018