A High Anti-Thermal-Quenching Behavior of Traditional Sm3+ Doped Srmoo4 Phosphor for New Application in Temperature Sensing

High anti-thermal-quenching SrMoO4: Sm3+ orange red-emitting phosphors for novel application in temperature measurement were prepared by traditional solid-phase synthesis method. SrMoO4: Sm3+ phosphor with scheelite structure was assigned to tetragonal system and I41/a(88) space group. Sm3+ ions could occupy Sr2+ lattice sites of SrMoO4. SrMoO4: Sm3+ consisted of irregular microparticle with well-crystallized pomegranate seed-like morphology and Sm3+ ions can be evenly distributed in the SrMoO4 matrix. The band gap value of SrMoO4: 1.0%Sm3+ (~4.228 eV) is less than that of SrMoO4 (~4.267 eV), which is due to generation of defective energy levels in band gap. The specific type of concentration quenching is ascribed to dipole−quadrupole interaction. SrMoO4: 1.0%Sm3+ had excellent thermal stability and near zero thermal quenching property of 99.4% at 423K with activation energy of 0.318 eV. Two thermometry strategies (Normalized intensity and FIR) would be used for temperature sensing. SrMoO4:Sm3+ phosphor had good relative sensitivities of 0.9% and 0.601% based on normalized intensity and FIR of 4F3/2→6H5/2/4G5/2→6H7/2 transitions, respectively. SrMoO4: Sm3+ phosphors had excellent thermal stability and good relative sensitivities, indicating that SrMoO4: Sm3+ has a potential for applications as pc-LEDs and optical thermometry.