CaGdF<sub>5</sub> based heterogeneous core@shell upconversion nanoparticles for sensitive temperature measurement

Xie, Xiaoyu; Wang, Wang; Chen, Haoran; Yang, Run; Wu, Han; Gan, Dechao; Li, Bin; Kong, Xianggui; Li, Qiqing; Chang, Yulei

doi:10.1039/d3ra00716b

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…As can be seen, visible UC emissions of the most commonly used NaYF 4 :20%Yb 3+ /2%Er 3+ @NaYF 4 core–shell nanoparticles exhibited a huge decline as the temperature was increased from 303 to 463 K (Figure a,b). This is attributed to the increased phonon vibration induced by the temperature increment, resulting in the decreased luminescence output through nonradiative relaxation. , Notably, UC emissions from ultrathin KLu 2 F 7 :20%Yb 3+ /2%Er 3+ @KLu 2 F 7 nanoflakes increase rapidly as the temperature increases, creating a huge ∼304-fold thermal enhancement in total (Figure b), which is achieved by eliminating the surface-related luminescence quenching. The temperature-dependent decay curves were investigated and are shown in Figures c, S9 and S10.…”

Section: Resultsmentioning

confidence: 99%

Huge Thermal Enhancement of Surface-Dominant Quasi-2D Upconversion Nanoflakes

Sun

Shang

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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Long-term thermal quenching of upconversion (UC) limits the usage of UC materials in nanothermometers, lighting phosphors, etc. Although UC thermal enhancement has been achieved through thermal alleviation of surface quenching, the regulation of the balance between internal multiphonon nonradiative relaxation-induced thermal quenching and external surface quencher release-induced thermal enhancement is still a big challenge. Here, we demonstrate a new strategy to achieve huge UC thermal enhancement by constructing surface-dominant quasi-2D KLu2F7:20%Yb3+/2%Er3+@KLu2F7 core–shell nanoflakes with an ultrathin thickness of 1.5 nm. The surface-dominant design enables enhancements of ∼820-fold at the 523 nm band and ∼304-fold in total as the temperature increases from 303 to 463 K. Similar huge UC thermal enhancements are also observed in Ho3+ (∼383-fold)- and Tm3+ (∼324-fold)-doped nanoflakes. Higher relative and absolute sensitivities of the thermally coupled state pairs (Er3+:2H11/2/4S3/2) with respective plateau values of 0.940% K–1 (303 K) and 0.509% K–1 (463 K) are achieved, which obviously outperform the thermal-quenching NaYF4:20%Yb3+/2%Er3+@NaYF4 nanoparticles. Moreover, the highly thermally enhanced nanoflakes enable the development of temperature-dependent anticounterfeiting inks and encryption, favoring the high-temperature usage of luminescence materials.

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Section: Resultsmentioning

confidence: 99%

Huge Thermal Enhancement of Surface-Dominant Quasi-2D Upconversion Nanoflakes

Sun

Shang

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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Near Infrared Multiwavelength Raman Anti-Stokes/Stokes Thermometry of Titanium Dioxide

Zani,

Pilot,

Pedron

et al. 2024

Preprint

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Near-Infrared Multiwavelength Raman Anti-Stokes/Stokes Thermometry of Titanium Dioxide

Zani,

Pilot,

Pedron

et al. 2024

Chemosensors

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The use of multiple wavelengths to excite Titanium Dioxide Raman scattering in the near-infrared was investigated for optical nanothermometry. Indeed, Raman spectroscopy can be a very interesting technique for this purpose, as it offers non-disruptive contactless measurements with a high spatial resolution, down to a few µm. A method based on the ratio between the anti-Stokes and Stokes peaks of Anatase Titanium Dioxide was proposed and tested at three different wavelengths, 785, 800 and 980 nm, falling into the first biological transparency window (BTW-I). Using a temperature-controller stage, the temperature response of the sample was measured between 20 and 50 °C, allowing the thermal sensitivity for this range to be estimated. The use of sufficiently high laser power results in the generation of local heating. A proof of concept of the proposed thermometric method was performed by determining the extent of local heating induced by increasing laser power. By exciting with an 800 nm laser at low power intensities, a temperature equal to room temperature (RT) was found, while a maximum temperature increase of 15 °C was detected using the anti-Stokes/Stokes method.

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CaGdF₅ based heterogeneous core@shell upconversion nanoparticles for sensitive temperature measurement

Abstract: The heterogeneous core@shell UCNPs are promising for optical temperature sensors.

Cited by 3 publications

References 28 publications

Huge Thermal Enhancement of Surface-Dominant Quasi-2D Upconversion Nanoflakes

Huge Thermal Enhancement of Surface-Dominant Quasi-2D Upconversion Nanoflakes

Near Infrared Multiwavelength Raman Anti-Stokes/Stokes Thermometry of Titanium Dioxide

Near-Infrared Multiwavelength Raman Anti-Stokes/Stokes Thermometry of Titanium Dioxide

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CaGdF5 based heterogeneous core@shell upconversion nanoparticles for sensitive temperature measurement

Abstract: The heterogeneous core@shell UCNPs are promising for optical temperature sensors.

Cited by 3 publications

References 28 publications

Huge Thermal Enhancement of Surface-Dominant Quasi-2D Upconversion Nanoflakes

Huge Thermal Enhancement of Surface-Dominant Quasi-2D Upconversion Nanoflakes

Near Infrared Multiwavelength Raman Anti-Stokes/Stokes Thermometry of Titanium Dioxide

Near-Infrared Multiwavelength Raman Anti-Stokes/Stokes Thermometry of Titanium Dioxide

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CaGdF₅ based heterogeneous core@shell upconversion nanoparticles for sensitive temperature measurement