Abstract: In the study， a series of Eu³⁺ and Mn⁴⁺ singly doped and co-doped Ba₂SrWO₆ phosphors were successfully synthesized by high-temperature solid-state reaction method. The crystal structure， sample morphology， and spectral properties of the phosphors were characterized and analyzed using X-ray diffraction， scanning electron microscopy， and spectral analyzer. The results indicate that doping with Eu³⁺ and Mn⁴⁺ does not alter the crystal structure of Ba₂SrWO₆， with all samples maintaining a single pure phase. Under 325 nm excitation， Ba₂SrWO₆∶Eu³⁺/Mn⁴⁺ phosphors exhibit significant red emission， including the ⁵D₀→⁷F₁ characteristic transition of Eu³⁺ at 594 nm， the ⁵D₀→⁷F₂ characteristic transition at 615 nm and the ²E_g→⁴A_2g transition of Mn⁴⁺ at 695 nm. The emission peak positions in the co-doped system are consistent with those of the singly doped system. The composition with the highest luminous intensity is Ba₂SrWO₆∶7% Eu³⁺/0.6% Mn⁴⁺. Within the temperature range of 300~500 K， based on the fluorescence intensity ratio （I_Eu/I_Mn）， the maximum relative sensitivity reaches 0.87% K^-1 at 300 K， and the maximum absolute sensitivity is 0.005 9 K^-1 at 510 K. These results demonstrate that Ba₂SrWO₆∶Eu³⁺/Mn⁴⁺phosphors are used as candidate materials for efficient optical temperature sensing.

Key words: rare earth ion; transition metal; dual activator; Eu³⁺/Mn⁴⁺ co-doping; high-temperature solid-state method; fluorescence intensity ratio; temperature sensing