Synthesis, Characterization and Photophysical Properties of Eu3+ Doped in BaMoO4

Abstract

In this work Ba(0.99)Eu(0.01)MoO(4) (BEMO) powders were prepared by the first time by the Complex Polymerization Method. The structural and optical properties of the BEMO powders were characterized by Fourier Transform Infra-Red (FTIR), X-ray Diffraction (XRD), Raman Spectra, High-Resolution Scanning Electron Microscopy (HR-SEM) and Photoluminescent Measurements. XRD show a crystalline scheelite-type phase after the heat treatment at temperatures greater than 400 degrees C. The ionic radius of Eu(3+) (0.109 nm) is lower than the Ba(2+) (0.149 nm) one. This difference is responsible for the decrease in the lattice parameters of the BEMO compared to the pure BaMoO(4) matrix. This little difference in the lattice parameters show that Eu(3+) is expected to occupy the Ba(2+) site at different temperatures, stayed the tetragonal (S(4)) symmetry characteristic of scheelite-type crystalline structures of BaMoO(4). The emission spectra of the samples, when excited at 394 nm, presented the (5)D(1)-->(7)F(0, 1 and 2) and (5)D(0)-->(7)F(0, 1, 2, 3 and 4) Eu(3+) transitions at 523, 533, 554, 578, 589, 614, 652 and 699 nm, respectively. The emission spectra of the powders heat-treated at 800 and 900 degrees C showed a marked increase in its intensities compared to the materials heat-treated from 400 to 700 degrees C. The decay times for the sample were evaluated and all of them presented the average value of 0.61 ms. Eu(3+) luminescence decay time follows one exponential curve indicating the presence of only one type of Eu(3+) symmetry site.

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

“…In particular, CaTiO 3 can accommodate rare-earth ions in its structure; therefore, doping with these ions can be used not only to probe local centers but also to tune the optical properties of these materials [3]. Research into doping with such rare earth ions is of significant importance because of the potential of such doped materials to be applied as red phosphors and used in electroluminescent devices, optical amplifiers, and lasers [4,5].…”

Structural refinement, Raman spectroscopy, optical and electrical properties of (Ba1−xSrx)MoO4 ceramics

“…Recently, extensive research has been conducted on alkaline molybdate and tungstates materials because these materials have been widely employed in several industrial applications, such as: optoelectrical devices, microwave dielectric devices, gas sensor, photo-catalyst, amplifier and electrochromic devices [1][2][3][4][5][6][7][8]. These alkaline materials can be classified into two different classes; the first has a wolframite-type monoclinic structure and second has a scheelite-type tetragonal structure both with a general formula: ABO 4 , where: (A = Ba 2?…”

“…The thermodynamics and enthalpies of formation of tungstates and molybdate materials depends on the ionic radii, pH and alkaline earth metals which is highest in BaWO 4 and BaMoO 4 compounds compare to other alkaline metals followed by strontium molybdate SrMoO 4 (SMO), CaMoO 4 (CMO) etc., its kinetics of formation governs the transport of matter during heating process [24][25][26]. Moreover, different synthesis method and heating process, such as: solid state reaction route [27][28][29][30], precipitation [31][32][33][34], hydrothermal conventional [35, [36], polymeric precursor method [37,38], microwave-hydrothermal [39,40] and micro-emulsion method [41,42] has been used to prepared the BaMoO 4 and SrMoO 4 materials. It is being observed that these synthesis techniques are responsible for evolution for various morphological grains and hence changes the physical and chemical properties of these ceramics materials.…”

“…symmetry stretching of tetrahedral [MoO4 ] clusters assigned as m 1 (A 1 ), symmetry bending vibration m 2 (E), anti-symmetry stretching m 3 (F 2 ), anti-symmetry bending vibration m 4 (F 2 ) and free rotational m f.r (F 1 ) mode. The external modes m ext are correspond to the motion of the deltahedral [BaO 8 ]/[SrO 8 ] clusters assigned as a symmetry bending.…”

Europium-doped calcium titanate: Optical and structural evaluations

“…Therefore, research is needed for the development of new and appropriate phosphors for FEDs [1,2]. Eu 3+ ions are significantly important due to their potential application as red phosphors, electroluminescent devices, optical amplifiers and lasers when used as doping in a great variety of materials [3][4][5].…”