Color-conversion and photoluminescence properties of Ba2MgW(Mo)O6:Eu phosphor

Compounds B2AXO6:Eu (B = Ba, Sr; A = Ca; and X = W, Mo) have recently been investigated and suggested to be color-conversion phosphor for WLED devices. In this work, we investigated the photoluminescence properties of the analogues Ba2MgXO6:Eu (X = W and Mo) and the energy transfer from W(Mo)O6 groups to Eu3+ ions within the phosphors. The phase structure, UV–vis diffuse reflectance spectrum, photoluminescence properties and decay of Ba2MgW(1−x)MoxO6:Eu were studied as a function of the W/Mo ratio. It was found that these phosphors showed excellent color-conversion capability from near-UV to orange–red light. The color-conversion process was considered to be performed by energy transferring from MoO6 groups to doped Eu3+ ions. The MoO6 → Eu3+ energy transfer efficiency could be greatly enhanced by partial substitution of Mo by W. The structure and photoluminescence properties of Ba2AW0.5Mo0.5O6:Eu (A = Ca and Mg, respectively) compounds were also investigated to reveal the effect of the Eu3+ ion coordination environment on its photoluminescence properties.

• Compound Ba2MgMoO6:Eu as near-UV to red color-conversion phosphor.
• Color-conversion process is achieved by energy transfer from MoO6 groups to Eu3+.
• Partial substitution of MoO6 groups by WO6 increases the energy transfer efficiency.
• Luminescence efficiency depends on the coordination environment of Eu3+ greatly.