Ratiometric Optical Thermometry Based on Emission and Excitation Spectra of YVO₄:Eu³⁺ Nanophosphors

Abstract

Development of new approaches to the noncontact optical thermometry is of great importance for modern science and technology. In the current work, single-phase YVO 4 :Eu 3+ nanoparticles prepared via the modified Pechini technique were studied as luminescence thermometers. Thermal sensing was performed using two different ratiometric approaches: utilizing the luminescence intensity ratio between transitions emitted from two thermally coupled excited levels (emission spectrum) and between transitions originating from different thermally coupled low-lying levels (excitation spectrum). The first technique allows determining temperature within the 298−873 K range, whereas the second one allows determining temperature within 298−473 K. The spectral position of the 5 D 0 (1)− 7 F 1 (2) band was also suggested as a temperaturedependent parameter. Thermometric performance of YVO 4 :Eu 3+ nanophosphors including absolute and relative sensitivities, minimum temperature uncertainty, and repeatability was obtained and discussed.

Photophysical and Theoretical Interpretation of the Insensitive Emission to Temperature of a Metallopolymer Containing Europium Ions

“…In this context, the challenge resides mainly in the design and preparation of ratiometric materials, especially metallopolymers, as micro- or nanoscale thermometers for quantitative measurements . A variety of luminescent materials have been developed as luminescent ratiometric thermometers, such PEDOT:PSS with CS solution, RE-VO 4 , Au-MOF, La-MOF, fluorescent nanocapsules, YVO 4 :Eu 3+ nanophosphors, and lanthanide ion-doped upconversion nanoparticles, among others.…”

YVO4 Nanoparticles Doped with Eu3+ and Nd3+ for Optical Nanothermometry

“…Figure shows the normalized emission spectra of co-doped YVO 4 :Eu 3+ ,Nd 3+ and mixed YVO 4 :Eu 3+ + YVO 4 :Nd 3+ NPs with different doping concentrations. These spectra were obtained using host excitation mechanism (λ ex = 300 nm) . One can see that the emission spectra include bands corresponding to the electron transitions in both lanthanides.…”

“…These spectra were obtained using host excitation mechanism (λ ex = 300 nm). 39 One can see that the emission spectra include bands corresponding to the electron transitions in both lanthanides. The most prominent transitions of Eu 3+ ions are 5 D 0 − 7 F 1 (593 nm), 5 D 0 − 7 F 2 (617 nm), 5 D 0 − 7 F 3 (650 nm), and 5 D 0 − 7 F 4 (696 nm), whereas the observed Nd 3+ transitions are 4 F 5/2 − 4 I 9/2 (812 nm), 4 F 3/2 − 4 I 9/2 (878 nm), 4 F 3/2 − 4 I 11/2 (1062 nm), and 4 F 3/2 − 4 I 13/2 (1340 nm).…”

Eu3+-doped ratiometric optical thermometers: Experiment and Judd-Ofelt modelling

“…Among these techniques, the luminescence thermometry has gained considerable interest because of its advantages of fast response and applicability in hostile environments and high electromagnetic fields [10]. Luminescence thermal sensing was successfully demonstrated using different types of phosphors including quantum dots, fluorescent dyes and proteins, polymers, metal-organic frameworks, and rare earth or transition metal-doped materials [11][12][13][14][15][16][17][18]. Rare earth-doped phosphors have attracted the most attention as optical thermometers due to their unique spectroscopic properties: narrow emission and excitation lines, long lifetime, large Stokes shift, and diversity of emitting wavelength [19,20].…”