Synthesis and Luminescent Properties of M 2 V 2 O 7 : Eu ( M 0 Sr , Ba )
نویسندگان
چکیده
A solution combustion route for the synthesis of Eu-activated M2V2O7 (M 0 Sr, Ba) and their luminescent properties have been investigated. Structure and luminescent characteristics of Sr2V2O7:Eu 3+ and Ba2V2O7:Eu 3+ nanophosphors have been studied by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, fluorescence spectrometry and Fourier transform infra-red spectroscopy. The incorporation of Eu activator in these nanoparticles has been checked by luminescence characteristics. These nanoparticles have displayed red color under a UV source which is due to characteristics transition of Eu from D0 → F2 at 613 nm in both Sr2V2O7:Eu 3+ and Ba2V2O7:Eu 3+ nanophosphors. In addition, the optimal Eu doped contents of Sr2(1-x)Eu2xV2O7 and Ba2(1-x)Eu2xV2O7 nanophosphors for both were 4 mol%.
منابع مشابه
Persistent luminescence in MSi2O2N2:Eu phosphors
In this work we study the persistent luminescence properties of europium-doped alkaline earth silicon oxynitrides (CaSi2O2N2, SrSi2O2N2 and BaSi2O2N2). All compounds show afterglow emission, with an emission spectrum which is similar to the steady state photoluminescence. The afterglow decay time for BaSi2O2N2:Eu and SrSi2O2N2:Eu is about 50 and 100 minutes respectively, while for CaSi2O2N2:Eu ...
متن کاملLuminescent Afterglow Behavior in the M2Si5N8: Eu Family (M = Ca, Sr, Ba)
Persistent luminescent materials are able to emit light for hours after being excited. The majority of persistent phosphors emit in the blue or green region of the visible spectrum. Orange- or red-emitting phosphors, strongly desired for emergency signage and medical imaging, are scarce. We prepared the nitrido-silicates Ca₂Si₅N₈:Eu (orange), Sr₂Si₅N₈:Eu (reddish), Ba₂Si₅N₈:Eu (yellowish orange...
متن کاملOne-Pot Synthesis of Single-Source Precursors for Nanocrystalline LED Phosphors M<sub>2</sub>Si<sub>5</sub>N<sub>8</sub>:Eu<sup>2+</sup> (M = Sr, Ba)
Highly efficient red-emitting nitridosilicate phosphors Sr2Si5N8:Eu and Ba1.5Sr0.5Si5N8:Eu (doping level 1 %) applicable to phosphor converted pc-LEDs were synthesized in nanocrystalline form at low temperatures employing a novel single-source precursor approach. Synthesis starts from nanocrystalline silicon and uses mixed metal amides M(NH2)2 with M ) Sr, Ba, Eu as reactive intermediates. In a...
متن کاملPreparation of persisted luminescence pigment and investigation of in glaze compatibility
In this paper, preparation of SrAl2O4:Eu,Dy luminescent pigment has been investigated. Coprecipitation as a low cost and facile method was selected. X-ray diffraction patterns indicated the formation of SrAl2O4:Eu,Dy phase through calcinations process above 800 °C. Moreover, a few amount of silica caused the structural transformation to alumina silicate phase. Transparent glaze which consist of...
متن کاملA europium complex with enhanced long-wavelength sensitized luminescent properties.
We report a new complex Eu(tta)(3).bpt (tta = thenoyltrifluoroacetonate; bpt = 2-(N,N-di-ethylanilin-4-yl)-4,6-bis(pyrazol-1-yl)-1,3,5-triazine) with excellent long-wavelength sensitized luminescent properties, in which four hydrogen atoms replace the methyl groups at the 3,3'- and 5,5'-positions of the pyrazolyl rings in a previously reported complex Eu(tta)(3).dpbt. Upon visible-light excitat...
متن کامل