Preparation and properties of Dy³⁺-Sm³⁺-Tb³⁺ co-doped Na_0.98Sr_0.02Y(MoO₄)_0.8(WO4)_1.2 phosphors

In this paper, Dy3+ single-doped, Dy3+-Sm3+ double-doped and Dy3+-Sm3+-Tb3+ triple-doped Na0.98Sr0.02Y(MoO4)(0.8)(WO4)(1.2) phosphors were synthesized using hydrothermal method and their structures, luminescent properties and thermal stability were investigated. The prepared single-doped, double-doped and triple-doped series of Na0.98Sr0.02Y(MoO4)(0.8)(WO4)(1.2) phosphors all exhibited a tetragonal scheelite structure. Na0.98Sr0.02Y0.926(MoO4)(0.8)(WO4)(1.2): 2%Dy3+, 5%Sm3+, 0.4%Tb3+ phosphor correlated with correlated color temperature of 5611 K and chromaticity coordinates of (0.33, 0.3284), achieving white light emission. Moreover, the Na0.98Sr0.02Y0.926(MoO4)(0.8)(WO4)(1.2): 2%Dy3+, 5%Sm3+, 0.4%Tb3+ phosphor exhibited a maximum activation energy value of 0.17 eV, indicating excellent thermal stability.