Constructing\nDual-Emitting via Energy Transfer in\nSr<sub>2</sub>ScO<sub>3</sub>F:Mn<sup>4+</sup>,Nd<sup>3+</sup> Phosphors\nFor High-Performance Temperature Sensing

The\ndevelopment of high-sensitivity thermometers has become increasingly\nimportant in recent years as the demand for noncontact optical temperature\nmeasurement has grown. Herein, we report a series of Sr<sub>2</sub>ScO<sub>3</sub>F:Mn<sup>4+</sup>,Nd<sup>3+</sup> (SSOF:Mn<sup>4+</sup>,Nd<sup>3+</sup>) phosphors synthesized by the traditional high-temperature\nsolid-state method for high-performance temperature sensing. Sr<sub>2</sub>ScO<sub>3</sub>F possesses a [ScO6F] octahedron and [SrO9F]\ntridecahedron, doped Mn<sup>4+</sup> ions occupy the octahedral sites\nand emit deep red light at 650–750 nm, and doped Nd<sup>3+</sup> ions occupy the tridecahedral sites and emit near-infrared light.\nDue to the energy transfer from the Mn<sup>4+</sup> to Nd<sup>3+</sup> ions, the SSOF:Mn<sup>4+</sup>,Nd<sup>3+</sup> phosphor exhibits\nintense dual-center emissions. On the basis of the different thermal\nquenching behaviors of the Mn<sup>4+</sup> and Nd<sup>3+</sup> ions,\nhigh-sensitivity ratiometric thermometers can be achieved using fluorescence\nintensity ratio technology, and the high relative sensitivity (<i>S</i><sub>r</sub>) and absolute sensitivity (<i>S</i><sub>a</sub>) reached 3.40% K<sup>–1</sup> (at 343 K) and\n0.2580 K<sup>–1</sup> (at 483 K), respectively. Our work not\nonly studies the photoluminescence characteristics of SSOF:Mn<sup>4+</sup>,Nd<sup>3+</sup> phosphors but also points out that SSOF:Mn<sup>4+</sup>,Nd<sup>3+</sup> phosphors have important potential applications\nin optical temperature measurement.