A new red phosphor for high time-resolved thermal sensitivity and plant growth.

Luminous materials with a rapid lifetime response have garnered significant interest in sensing technology. In this work, the transition element Mn doped phosphor Sr ₂ TiO ₄ :Mn ⁴⁺ was synthesized by a traditional high temperature solid phase method. The emission peak of Sr ₂ TiO ₄ :0.009Mn ⁴⁺ aligns closely with the absorption peak of phytochrome P _fr . The temperature-dependent photoluminescence (PL) spectra and lifetime of Sr ₂ TiO ₄ :0.009Mn ⁴⁺ were examined within the temperature range of 273-323 K. The temperature sensing characteristics based on the lifetime were analyzed, and the maximum relative sensitivity was 14.93% K ^-1 at 309 K. The high sensitivity of the Sr ₂ TiO ₄ :0.009Mn ⁴⁺ phosphor makes it a promising material for temperature sensing applications.