Photoluminescence Studies of ZnWO4:Sm3+ Synthesized by Ethylene Glycol Route

Abstract

A series of crystalline ZnWO4 doped Sm 3+ with different concentrations of dopant ion were successfully prepared by the co-precipitation method using ethylene glycol followed by annealing of the precipitates formed. The prepared sample was crystallized in monoclinic structure with spherical morphology and crystallite sizes extend in the ranges from 10-20 nm. Photoluminescence analysis of the samples showed that there exist strong absorption band with maximum around 275 nm and broad emission band due to WO6 6-group with maximum around 456 nm along with weakly intense peaks characteristics to the f-f transitions of Sm 3+ ion at 569, 612 and 653 nm. The optimum concentration of Sm 3+ ion in ZnWO4 lattice is obtained at 3 at. % and beyond this, the emission intensity originated from Sm 3+ ion decreases due to concentration quenching.

A Potentiometric Studies of Ternary Complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Ethylenediaamine-N,N,N1,N1-Tetraacetic Acid and Melonic Acid

“…(where H 2 O = MLA; M(II) = Co(II), Ni(II), Cu(II) and Zn(II).Ternary SystemCurve f(Figs [1][2][3][4]. show the titration of 1:1:1,M(II)-EDTA-MLA ternary system.…”

Ion Association and Solvation Behaviour of Nickel(II) Complexes in Binary Mixtures of DMSO-H2O at Different Temperatures

“…Values of Λ 0 of salts increase upto the mole fraction X DMSO (Tables 1 and 2). If change of total solvation is reflected by the variation of Λ 0 η 0 [15], the increase of the Walden product indicates the weak salvation of the ions. The decrease of the Walden product indicatives an increase of the hydrophobic salvation with increasing concentration of DMSO.…”