Authors : K. V. Dabre and S. J. Dhoble
Page Nos : 382-387
Description :
Abstract
The microcrystalline samples of double perovskite tungstates M3WO6 (M = Ca, Sr and Ba) doped with Eu3+ ion were synthesized by modified solid state reaction method. The phosphor materials were characterized by XRD, SEM and photoluminescence (PL) spectroscopy. The XRD result reveals the formation of well crystallized and phase pure microcrystalline phosphor samples. Both of the PL excitation and emission spectra of M3WO6:Eu3+ phosphors show very similar nature. The excitation spectra of characteristic yellow emission of Dy3+ ion show a broad CT band of (WO6)6- complex in UV region. The intense host absorption for characteristic yellow emission of Dy3+ ion indicates the effective energy transfer from tungstate host to Dy3+ ion. The energy transfer from (WO6)6- complex to Dy3+ ion is more efficient in Sr3WO6 than Ca3WO6 and Ba3WO6. The color of Dy3+ doped M3WO6 phosphors varies from orange to cyan color due to different yellow to blue intensity ratio.
