Photoluminescence properties of Ca3WO6:Eu3+ red phosphor

Novel Ca3WO6:Eu3+ phosphor has been synthesized with different Eu3+ doping concentrations through the solid-state reaction method, and characterized by X-ray diffraction (XRD), scanning, electron microscopy (SEM), photoluminescence (PL) spectra and decay curve. The results of XRD and SEM show that all Ca3WO6:Eu3+ samples are single phase and have irregular morphology. In the excitation spectrum of Ca3WO6:Eu3+ phosphor, the broad excitation band centering at 310 nm is due to the combination of charge transfer from Eu3+ to O2- and W6+ to O2-. The intense red emission can be obtained under excitation into the D-5(2) state with 465 nm, which corresponds to the emission wavelength from blue light-emitting diodes (LEDs). The co-doped effect of alkali-metal ions (Li+, Na+, and K+) on the luminescence behavior of Eu3+-doped Ca3WO6 has been discussed in this paper. The luminescence properties suggest that novel Ca3WO6:Eu3+ phosphor may be a potential red phosphor for white LEDs. (C) 2013 Elsevier B.V. All rights reserved.