Synthesis and photoluminescence properties of Sm 3+ and Dy 3+ ions activated Ca 2Gd 2W 3O 14 phosphors

Abstract

Rare earth ions (Sm 3+ and Dy 3+) activated calcium gadolinium tungstate [Ca 2Gd 2W 3O 14] powder phosphors were synthesized by solid state reaction method at 1000 °C. The obtained phosphors were characterized by XRD, SEM, EDAX, FTIR and PL spectroscopy. The results of XRD patterns indicate the tetragonal phase structure of Sm 3+ and Dy 3+: Ca 2Gd 2W 3O 14 phosphors. From the SEM images of Sm 3+ and Dy 3+: Ca 2Gd 2W 3O 14 phosphors, it is observed that the average grain size is in the range 100–250 nm. The functional groups are identified by using the FTIR spectra and the elements present in the composition are confirmed by the EDAX profiles. Emission spectra of Sm 3+: Ca 2Gd 2W 3O 14 powder phosphors have shown strong red emission at 646 nm ( 4G 5/2 → 6H 9/2) with an excitation wavelength λ exci = 402 nm ( 6H 5/2 → 4F 7/2) and Dy 3+: Ca 2Gd 2W 3O 14 phosphors have shown yellow emission at 574 nm ( 4F 9/2 → 6H 13/2) with an excitation wavelength λ exci = 385 nm ( 6H 15/2 → 4I 13/2).