Mn-doped YMgTiO phosphors are synthesized by the traditional solid-state method. Powder X-ray diffraction, scanning electron microscope, and energy-dispersive X-ray spectrometer are employed to characterize the samples. The Mn-doped YMgTiO phosphors show the far-red emission at ∼715 nm, which is assigned to the E → A spin-forbidden transition of Mn. The temperature-dependent luminescent dynamics of Mn is described by a complete model associated with electron-lattice interaction and spin-orbit coupling. The noncontact optical thermometry of YMgTiO:Mn is discussed based on the fluorescence intensity ratio of thermally coupled anti-Stokes and Stokes sidebands of the efficient ∼715 nm far-red emission in the temperature range of 10-513 K. The maximum sensor sensitivity of YMgTiO:Mn is determined to be as high as 0.001 42 K at 153 K, which demonstrates potential applications for the optical thermometry at low-temperature environments.

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