Dy3+/Eu3+ co-doped CsGd(MoO4)2 phosphor with tunable photoluminescence properties for near-UV WLEDs applications

A series of color tunable Dy3+/Eu3+ co-doped CsGd(MoO4)(2)(CGM) phosphors were prepared by the conventional solid state reaction. The crystal structure, morphology, vibrational modes, luminescence properties and energy transfer mechanism were investigated. Upon near ultraviolet '(n-UV) excitation, Dy3+/Eu3+ co-doped phosphors exhibit the characteristics blue (F-4(9.2) -> H-6(15/2)), yellow (F-4(9.2) -> H-6(13/2)) and red (D-5(0) -> F-7(2)) emission corresponding to transitions of Dy3+and Eu3+ions. By changing the doping concentration of Dy3+ and Eu3+, the emission hue could be controlled via the energy transfer mechanism. The energy transfer efficiency and critical distance of Dy3+ and Eu3+ have been calculated. The calculated chromaticity coordinates and color correlated temperature of co-doped phosphors lie at the F-4 warm white points of standard illuminants. (C) 2016 Elsevier Ltd. All rights reserved.