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Ultrafast multi-photon excitation of ScVO4:Bi3+ for luminescence thermometry

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Abstract

We demonstrate a multi-photon excitation (MPE) scheme for luminescence thermometry using ScVO4:Bi3+. MPE is performed using a 37 fs Ti:sapphire laser pulse centered at 800 nm. Log-log plots of the phosphorescence intensity versus excitation power show that the 800 nm MPE of ScVO4:Bi3+ involves a 2- and 3-photon absorption process in comparison with a single-photon excitation (SPE) process at 266 and 400 nm. Spectroscopic investigation shows that with the 800 nm MPE and 266 nm SPE schemes, the emission spectra of ScVO4:Bi3+ are similarly characterized by emissions of the VO43− groups and Bi3+. MPE is advantageous to suppress fluorescence that interferes with the phosphorescence signal. We demonstrate this aspect for a ScVO4:Bi3+ coating applied on an alumina substrate. The luminescence lifetime is calibrated with temperature in the range of 294–334 K; the MPE scheme has an equally impressive temperature sensitivity (3.4–1.7%/K) and precision (0.2–0.7 K) compared with the SPE schemes. The MPE scheme can be applied to a variety of phosphors and is valuable for precise temperature measurements, even in applications where isolating interfering background emissions is challenging.

© 2021 Optica Publishing Group

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Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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