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The role of co-dopants, i.e. Dy, Ce, Tb or Y in SMS : Eu, RE 3+ phosphor sintered using solid state reaction method at 1250 o C under forming gas was studied. All SMS phosphors exhibited tetragonal Sr2MgSi2O7 as the domain phase and monoclinic SrSiO3 as the minor phase based on XRD analysis. It is noted that only single blue emission (469nm) contributed by Eu 2+ ions was detected in RTPL measurement regardless types of co-dopants introduced during the sintering process. This result indicatesdoi:10.1088/1742-6596/1082/1/012022 fatcat:4z3vww3uwjfb3bh4re62s2smnu