Optical Thermometry by Monitoring Dual Emissions from YVO₄ and Eu³⁺ in YVO₄:Eu³⁺ Nanoparticles

Abstract

Contactless optical thermometry is successfully applied for accurate local temperature sensing in many scientific and technological areas. Majority of optical thermometers utilize a ratiometric approach between thermally coupled levels. Such sensors have an inherent limitation of relative thermal sensitivity linked to the maximal energy gap between these levels, which can make them useless for some important applications. Here we report simple dual-center YVO 4 :Eu 3+ thermometers that do not have this limitation. Thermal sensing using YVO 4 :Eu 3+ nanoparticles is based on monitoring luminescence intensity ratio between YVO 4 host emission and Eu 3+ luminescence lines. By taking advantage of the different temperature behavior of the aforementioned emission bands, contactless sensing was demonstrated within 123-423 K range.High thermometric performances including sub-degree temperature resolution (up to 0.2 K) and relative thermal sensitivity (up to 1.4 % K -1 ) at room temperature reveal the good potential of YVO 4 :Eu 3+ phosphors for thermometry and lay a foundation for the future development of dualcenter probes.

Vibrationally Induced Photophysical Response of Sr2NaMg2V3O12:Eu3+ for Dual‐Mode Temperature Sensing and Safety Signs

“…To provide a more detailed analysis, the radiative and nonradiative decay rates at various temperatures were calculated using 4 f –4 f intensity theory. [ 57–65 ] The total radiative decay rate ( A R ) is estimated by taking the sum of radiative rates A 0 J for each 5 D 0 – 7 F J transition given bywhere υ 01 and υ 0 J are frequencies and I 01 and I 0 J are the integrated intensities of the 5 D 0 – 7 F 1 and 5 D 0 – 7 F J transitions and A 01 is the Einstein coefficient between the 5 D 0 and 7 F 1 levels. Using the observed lifetime τ obs of the 5 D 0 level, the nonradiative decay rate, A NR , is calculated by …”

Designing Optical Thermometers Using Down/Upconversion Ca14Al10Zn6O35: Ti4+, Eu3+/Yb3+, Er3+ Thermosensitive Phosphors

“…The PLE spectrum with monitor wavelength being 615 nm covers a range from 240 to 550 nm. The wide band of 240–350 nm is the result of the O 2– → Eu 3+ energy transfer. , Moreover, the sharp peaks are attributed to typical Eu 3+ 4f–4f transitions . The PL spectrum of Ca 14 Al 10 Zn 6 O 35 :0.5Ti 4+ , 0.1Eu 3+ phosphor excited by 273 nm light source is composed of a wide peak of Ti 4+ emission (300–570 nm) and several peaks of Eu 3+ emission (570–800 nm).…”

Manipulating Upconversion Emission and Thermochromic Properties of Ho3+/Yb3+-Codoped Al2Mo3O12 Microparticles by Negative Lattice Expansion for Multimode Visual Optical Thermometry

“…As a proof of this deduction, temperature-related FIR values of the UC emissions originating from 5 F 5 → 5 I 8 to 5 F 4 / 5 S 2 → 5 I 8 transitions (i.e., I 661 / I 541 ) and 5 F 5 → 5 I 8 to 5 F 4 / 5 S 2 → 5 I 7 transitions (i.e., I 661 / I 760 ) were elevated, as demonstrated in Figure a,b, respectively. It is apparent that the FIR values increase sharply with the increase of temperature in the range of 303–543 K. Note that by analyzing the relation between the FIR value and temperature, one knows that the following function is able to be used to fit the experimental data , where I 1 and I 2 are ascribed to the fluorescence intensities, A , B , and C are coefficients. By means of eq , the temperature-dependent FIR values of I 661 / I 545 and I 661 / I 760 are found to be FIR = 75.08 exp­(−1499.72/ T ) + 1.94 and FIR = 145.77 exp­(−837.83/ T ) + 4.03, respectively.…”