Highly Sensitive Dual-Mode Optical Thermometry in Double-Perovskite Oxides via Pr³⁺/Dy³⁺ Energy Transfer

Abstract

As increasing demand for noncontact temperature sensing, the development of a high-performance optical thermometer probe is more and more urgent. In this work, an efficient dual-mode optical thermometry strategy based on the Pr 3+ /Dy 3+ energy transfer (ET) in some typical double-perovskite oxides is presented, which offers a promising way to design FIR/lifetime dual-mode optical thermometry with excellent temperature-measuring sensitivity and signal discrimination. According to this strategy, double-perovskite La 2 MgTiO 6 :Pr 3+ /Dy 3+ phosphors are successfully synthesized. On the basis of diverse thermal responses between Pr 3+ and Dy 3+ , the FIR of Pr 3+ to Dy 3+ (four FIR mode) in this material displays outstanding optical thermometry performance from 298 to 548 K. The maximum absolute and relative sensitivities (S a and S r ) of mode 1 are 0.09 and 2.357% K −1 , being better than the current optical temperature measurement materials. For the fluorescence lifetime mode, the S a-max and S r-max values reach 2.85 × s 10 −4 and 1.814% K −1 . Furthermore, the dual-mode optical thermometry mechanism was presented and studied. It also demonstrated excellent optical thermometry performance in the other Pr 3+ /Dy 3+ codoped double-perovskite oxides, such as LaMg 0.598 Nb 0.402 O 3 , NaLa(MoO 4 ) 2 , NaGd(MoO 4 ) 2 , and NaLa(WO 4 ) 2 , proving the universality of the presented strategy. This article presents an effective Pr 3+ /Dy 3+ ET pathway for developing new and highly sensitive FIR/lifetime dual-mode optical temperature sensing materials.

Thermally boosted upconversion and downshifting luminescence in Sc2(MoO4)3:Yb/Er with two-dimensional negative thermal expansion

“…6d). The optimal Sr value of SMO:Yb/Er was observed to be an order of magnitude higher than that of other majority LLTs 39,[40][41][42][43][44] .…”

Highly sensitive optical temperature sensing based on pump-power-dependent upconversion luminescence in LiZnPO4:Yb3+–Er3+/Ho3+ phosphors

“…Various luminescent ions of this class have been acquired, such Ho 3+ , Pr 3+ , and Tm 3+ . [25][26][27][28] On the basis of the above points, new luminescent materials with high-temperature sensor sensitivity need to be explored urgently. To develop new inorganic phosphor materials of more excellent temperature-sensing characteristics, continuous researches are still highly solicited.…”

Constructing a Model for Tuning the Thermal Quenching Properties of Bismuth-Doped Phosphors by Energy-Gap Modulation

“…In recent years, phosphor materials have been widely used in lighting, temperature sensing, biological imaging, and other fields due to their environmental protection ability, low cost, high performance, and other advantages. − However, the thermal quenching property is still a key factor in the application of phosphor materials. In the field of illumination, phosphor-converted white-light-emitting diodes (pc-WLEDs) are integrated into our daily lives due to their long lifetime and low energy consumption, − while thermal quenching seriously affects the efficiency and the color rendering index of pc-WLEDs. − The development of white-light-emitting phosphors with excellent thermal stability is currently a major challenge. In the optical temperature detection field, zero-contact temperature detectors on the basis of the fluorescence intensity ratio (FIR) technique have been extensively studied, and some temperature detection phosphors with good temperature measurement performance have been developed. − However, improving the relative sensitivity of the detector has always been a major problem in optical temperature measurements.…”