Abstract
We have co-doped Mn4+ and Dy3+ into a perovskite structure host BaLaMgNbO6 (BLMN) in order to develop a new scheme of dual-mode optical thermometry. All the samples including single-doped and co-doped samples were successfully synthesized via a high-temperature solid-state reaction method. The phase purity and luminescence properties of the phosphors were characterized by X-ray powder diffraction, photoluminescence excitation and emission spectra. In particular, temperature-dependent emission spectra as well as luminescence decay curves measurements were performed on the co-doped BLMN:Mn4+, Dy3+ sample to inspect its temperature-dependent luminescence properties. Under 355 nm excitation, the fluorescence intensity ratio (FIR) between Dy3+ emission at 580 nm (4F9/2 → 6H13/2) and Mn4+ emission at 698 nm (2Eg→4A2g) as well as the fluorescence lifetime of Mn4+ (2Eg→4A2g) were investigated in the temperature range from 230 K to 470 K, and the maximum relative sensitivities are 1.82% K−1 at 457 K and 2.43% K−1 at 437 K, respectively. It should be noted that the emission peak of Mn4+ whose luminescence can be employed by lifetime-mode temperature sensing is located in the optical window of biological tissue, which could be used in biological application. All these investigations suggest that the BLMN:Mn4+, Dy3+ phosphor is very promising in dual-mode high-sensitivity optical thermometry.
Published Version
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