Up-conversion luminescence and temperature sensing based on Ba₃Y(BO₃)₃:Er³⁺,Yb³⁺ phosphors

Noncontact fluorescence temperature detection systems have become a significant research focus. In this study, a new Ba₃Y(BO₃)₃ phosphor co-doped with Er³⁺/Yb³⁺ was successfully synthesized using a high-temperature solid phase method. The introduction of Yb³⁺ as a sensitizer enhanced the luminescence properties of the Ba₃Y(BO₃)₃ phosphor. The occupation of Er³⁺ and Yb³⁺ ions in the crystal lattice was analyzed in detail. The up-conversion luminescence and underlying mechanisms were explained by the double logarithmic relationship between the luminescence intensity and pump power. The temperature sensitivity of the phosphors was explored in the range of 333-513 K using fluorescence intensity ratio technology based on the two green peaks (thermal coupling level Er³⁺). The temperature sensing <i>S</i> _<i>r</i> reached 1.44 × 10^-4 K^-1 at 333 K, indicating that Ba₃Y(BO₃)₃:Er³⁺,Yb³⁺ phosphors have potential applications as temperature sensors.