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

Abstract

Luminous materials with a rapid lifetime response have garnered significant interest in sensing technology. In this work, the transition element Mn doped phosphor Sr₂TiO₄:Mn⁴⁺ was synthesized by a traditional high temperature solid phase method. The emission peak of Sr₂TiO₄:0.009Mn⁴⁺ aligns closely with the absorption peak of phytochrome P_fr. The temperature-dependent photoluminescence (PL) spectra and lifetime of Sr₂TiO₄:0.009Mn⁴⁺ 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 Sr₂TiO₄:0.009Mn⁴⁺ phosphor makes it a promising material for temperature sensing applications.