Growth mechanism and vibrational and optical properties of SrMoO4: Tb3+, Sm3+ particles: green–orange tunable color

Abstract

A SrMoO 4 series co-doped with Tb 3? and Sm 3? was successfully prepared by the sonochemical method. The particles were characterized by X-ray diffraction, Raman spectroscopy, field emission gun scanning electron microscopy, UV-Vis spectroscopy and photoluminescence. Changes in SrMoO 4 : Tb 3? , Sm 3? morphologies were observed from an orderly growth of the particles. The mechanism of particle growth was proposed, indicating a hierarchical evolution of SrMoO 4 : Tb 3? , Sm 3? morphologies. The changes in emissions were evaluated by the effect of the dopants and their concentrations. Emissions were observed in white, green and orange according to the chemical composition of the samples. The SrMoO 4 and SrMoO 4 : 1% Sm samples showed excellent results for CRI (79%) and LE ([ 310 lm/W opt ), thus indicating a material with potential for efficient white light emission.

Synthesis and characterization of solid solution of Sr(Mo1-xWx)O4 crystals obtained by the sonochemical method and their sonophotocatalytic properties

“…Therefore, the increase in the E gap value proportional to the replacement of the Mo 6+ by the W 6+ cations suggest an increase in the degree of structural organization, although the difference between the ionic radii is small [75]. Dos Santos et al [55] and Zhang et al [50] synthesized SrMoO 4 microcrystal by the sonochemical method with E gap of 4.05 eV and 3.72 eV, respectively, but, to date, no E gap values associated with SrWO 4 crystals synthesized by the sonochemical method on the micro scale have been reported. Theoretical studies estimate E gap values for SrMoO 4 crystals between 3.69 and 5.35 eV [5,[76][77][78] and for SrWO 4 between 4.41 and 5.37 eV [79][80][81][82].…”

“…A and B modes are nondegenerate while E modes are doubly degenerate. The "g" and "u" subscripts indicate the parity under inversion in centrosymmetric crystals [55,56].…”

“…A few star-like and ower-like morphologies also emerged (with a mean size of approximately 3 µm) possibly due to agglomeration of spindle-like morphologies [69]. However, according to Dos Santos et al [55], star-like morphologies can also arise from a single spindle after dividing its ends, generating new tips and so on, until the morphologies evolve into ower-like crystals.…”

Synthesis and characterization of BaWO4:xTm3+,yPr3+ obtained by ultrasonic spray pyrolysis

“…No additional peaks were identified, showed only the tetragonal phase and so the doping occurred satisfactorily. SrMoO 4 , CaWO 4 , ZnMoO 4 , BaMoO 4 , ZnWO 4 were synthesized in different methods with or without rare earth doping and showed to be excellent host matrices due to their being obtained with high purity and without the presence of secondary oxides [39][40][41][42]. Molybdates and tungstates have a matrix with excellent capacity to host dopants, especially in the hosting of rare earth.…”

Efficient near-infrared quantum cutting by cooperative energy transfer in Bi3TeBO9:Nd3+ phosphors

“…ions. Oxide crystals are considered important for photonic applications, thanks to the excellent transparency window from UV to NIR as well as high RE 3? doping ability [6][7][8]. The synthesis, crystal structure, electronic structure, some optical and spectroscopic properties of undoped BTBO were already reported [9][10][11][12].…”