This article reviews on previous and on-going works relating to the interaction of Eu3+, Y3+ and Sm3+ used AY(1-x)Eux(MO4)2 where (A=Li+, K+ and Na+) and (M=Mo and W) in alkaline metals red phosphors - AY(1- x)EuxSmy(MoO4)2. The structures of the phosphors also covered in the article for looking the trend of the phosphors. From this review, it can be expected that the presence of Sm3+ on Y3+ at 45 mol % can enhance the intensity of the emission. A further research will be conducted in looking for the potentiality of Sm3+ ion when added to the host materials.
