Optically Detected Thermal Effects in Rare-Earth Doped Materials for Host Characterization, Thermometric Devices, Nanothermometry and Biothermometry

Menezes, Leonardo de S.; Araújo, Cid B. de

doi:10.5935/0103-5053.20150190

Cited by 9 publications

(10 citation statements)

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“…Several temperature-dependent parameters can be used to measure temperature at a local scale using a luminescence signal, such as band shape, spectral line position, bandwidth, lifetime, and polarization. − Luminescence intensity ratio (LIR) is a temperature-sensing technique based on the change in the relative intensities of two radiative transitions, generally from rare-earth (RE) ions . It has practical advantages over thermometry techniques like lifetime measurements since it is immune to pump light fluctuations and it can be done under continuous-wave (CW), low-power excitation, which is desirable when studying samples of biological interest.…”

Section: Introductionmentioning

confidence: 99%

Single Er³⁺/Yb³⁺-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

et al. 2021

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In this work, Er 3+ /Yb 3+ -codoped yttria (Y 2 O 3 ) nanocrystals were characterized for the first time as a thermometric probe at the single nanocrystal level using the luminescence intensity ratio technique. Nanothermometer characterization was performed by exciting the single nanoparticles with a lowpower, continuous-wave laser emitting at 980 nm, within one of the biological windows. The nanothermometer showed a relative sensitivity of 1.31% and an accuracy of 0.1 K at 300 K. The results were described by a rate equation analysis using a dual effective phonon model, which reproduced the expected phonon energy of the host matrix.

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Section: Introductionmentioning

confidence: 99%

Single Er³⁺/Yb³⁺-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

et al. 2021

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“…These are described by the Boltzmann population distribution law. Thus, LIR can be related to the intensity of the radiation emitted in the two green UC bands as ( Menezes and De Araújo, 2015 ):

where E 21 is the energy gap between both thermally coupled energy levels, and k is the Boltzmann constant. The constant A fundamentally depends on the degeneracies (2J + 1) of both energy levels, the total spontaneous emission rates, and the angular frequencies of the |2> → |0> and |1> → |0 > transitions associated with the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions ( Shinn et al, 1983 ; Brites et al, 2016 ; Balabhadra et al, 2017 ).…”

Section: Resultsmentioning

confidence: 99%

“…Thermal sensitivity is the rate at which the intensity ratio changes with temperature ( Menezes and De Araújo, 2015 ), so

…”

Section: Resultsmentioning

confidence: 99%

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Single Er3+, Yb3+: KGd3F10 Nanoparticles for Nanothermometry

et al. 2021

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Among several optical non-contact thermometry methods, luminescence thermometry is the most versatile approach. Lanthanide-based luminescence nanothermometers may exploit not only downshifting, but also upconversion (UC) mechanisms. UC-based nanothermometers are interesting for biological applications: they efficiently convert near-infrared radiation to visible light, allowing local temperatures to be determined through spectroscopic investigation. Here, we have synthesized highly crystalline Er3+, Yb3+ co-doped upconverting KGd3F10 nanoparticles (NPs) by the EDTA-assisted hydrothermal method. We characterized the structure and morphology of the obtained NPs by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and dynamic light scattering. Nonlinear spectroscopic studies with the Er3+, Yb3+: KGd3F10 powder showed intense green and red emissions under excitation at 980 and 1,550 nm. Two- and three-photon processes were attributed to the UC mechanisms under excitation at 980 and 1,550 nm. Strong NIR emission centered at 1,530 nm occurred under low 980-nm power densities. Single NPs presented strong green and red emissions under continuous wave excitation at 975.5 nm, so we evaluated their use as primary nanothermometers by employing the Luminescence Intensity Ratio technique. We determined the temperature felt by the dried NPs by integrating the intensity ratio between the thermally coupled 2H11/2→4I15/2 and 4S3/2→4I15/2 levels of Er3+ ions in the colloidal phase and at the single NP level. The best thermal sensitivity of a single Er3+, Yb3+: KGd3F10 NP was 1.17% at the single NP level for the dry state at 300 K, indicating potential application of this material as accurate nanothermometer in the thermal range of biological interest. To the best of our knowledge, this is the first promising thermometry based on single KGd3F10 particles, with potential use as biomarkers in the NIR-II region.

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“…This effect is associated with the thermal equilibrium in the population of excited states 2 H 11/2 and 4 S 3/2 . 19 An interesting point relates to the fact that the green emission can be observed with excitation either in the UV or in the infrared region. In the latter case, the so-called upconversion emission is treated.…”

Section: Introductionmentioning

confidence: 99%

UV and Temperature-Sensing Based on NaGdF₄:Yb³⁺:Er³⁺@SiO₂–Eu(tta)₃

Nigoghossian

Messaddeq

Boudreau³

et al. 2017

ACS Omega

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A multifunctional nanosystem was synthesized to be used as a dual sensor of UV light and temperature. NaGdF 4 :Yb 3+ :Er 3+ upconverting nanoparticles (UCNPs) were synthesized and coated with a silica shell to which a europium(III) complex was incorporated. The synthesis of NaGdF 4 UCNPs was performed via thermal decomposition of lanthanide ion fluoride precursors in the presence of oleic acid. To achieve sufficient water dispersibility, the surface of the hydrophobic oleate-capped UCNPs in the hexagonal phase was modified by a silica coating through a modified Stöber process through a reverse microemulsion method. An Eu(tta) 3 (tta: thenoyltrifluoroacetonate) complex was prepared in situ at the silica shell. A dual-mode nanothermometer was obtained from a near infrared to visible upconversion fluorescence signal of Er 3+ ions together with UV-excited downshifting emission from the Eu 3+ complex. Measurements were recorded near the physiological temperature range (293–323 K), revealing excellent linearity ( R 2 > 0.99) and relatively high thermal sensitivities (≥1.5%·K –1 ). The Eu(tta) 3 complex present in the silica shell was tested as the UV sensor because of the Eu 3+ luminescence dependence on UV-light exposure time.

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Optically Detected Thermal Effects in Rare-Earth Doped Materials for Host Characterization, Thermometric Devices, Nanothermometry and Biothermometry

Cited by 9 publications

References 1 publication

Single Er³⁺/Yb³⁺-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

Single Er³⁺/Yb³⁺-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

Single Er3+, Yb3+: KGd3F10 Nanoparticles for Nanothermometry

UV and Temperature-Sensing Based on NaGdF₄:Yb³⁺:Er³⁺@SiO₂–Eu(tta)₃

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Optically Detected Thermal Effects in Rare-Earth Doped Materials for Host Characterization, Thermometric Devices, Nanothermometry and Biothermometry

Cited by 9 publications

References 1 publication

Single Er3+/Yb3+-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

Single Er3+/Yb3+-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

Single Er3+, Yb3+: KGd3F10 Nanoparticles for Nanothermometry

UV and Temperature-Sensing Based on NaGdF4:Yb3+:Er3+@SiO2–Eu(tta)3

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Single Er³⁺/Yb³⁺-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

Single Er³⁺/Yb³⁺-Codoped Yttria Nanocrystals for Temperature Sensing: Experimental Characterization and Theoretical Modeling

UV and Temperature-Sensing Based on NaGdF₄:Yb³⁺:Er³⁺@SiO₂–Eu(tta)₃