Luminescence Properties of K2Bi(PO4)(MoO4):Gd,Eu Solid Solutions

Solid solutions K₂Bi(PO₄)(MoO₄):Gd,Eu containing from 0.1 to 30 mole% of europium(III) and 0.1 mole% of gadolinium(III) have been prepared by conventional solid state reaction. The samples are characterized by X-ray powder diffraction method, IR and luminescence spectroscopies. It has been shown that doping with Eu³⁺ does not affect the symmetry of the layered framework. At room temperature, all the studied samples are characterized by intense red photoluminescence, which is associated with ⁵D₀→⁷F_0-4 emission transitions in Eu³⁺ ions. Due to the absence of concentration quenching and color characteristics, K₂Bi(PO₄)(MoO₄):Gd,Eu has prominent prospects for application as a red phosphor.