Upconversion-mediated Boltzmann thermometry in double-layered Bi₂SiO₅:Yb³⁺,Tm³⁺@SiO₂ hollow nanoparticles

Abstract

Highly sensitive Boltzmann thermometry by double-layered Bi2SiO5:Yb3+,Tm3+@SiO2 hollow nanoparticles with exceptional thermometric performances and biocompatibility are demonstrated.

Rational Design of Ratiometric Luminescence Thermometry Based on Thermally Coupled Levels for Bioapplications

“…Notably, the host materials with excellent physicochemical and luminescence thermal stability are required for such kind of thermometers, in which pure phase and intense emissions should maintain in high temperature. [ 59–61 ] For instance, Cao et al. employed violet‐emitting levels 4 G 11/2 and 2 H 9/2 ( ∆E ≈ 1455 cm –1 ) as TCLs in polycrystalline CaWO 4 :Er 3+ , Yb 3+ , where considerable S r value was obtained (≈2.3% K –1 at 303 K) and S a reached the maximum value 0.0073 K –1 at upper limit experimental temperature 873 K. [ 62 ] Recently, our group demonstrated the potentiality of truncated octahedral YF 3 :Tm 3+ , Yb 3+ microcrystals as FIR thermometers based on completely separated transitions 3 F 2, 3 / 3 H 4 → 3 H 6 ( Figure a,b).…”

Optical temperature sensing based on upconversion nanoparticles with enhanced sensitivity via dielectric superlensing modulation

“…Figure 5a shows temperature dependent FIR of the composite film without/with PS sphere superlens, while the experimental dependence of FIR on temperature can be well fitted by Eq (1). This indicates that the dependence of FIR 310/360 on temperature can be regarded as a Boltzmann-like behavior [45], although the energy gap between these excited states reaches about 4480 cm -1 . From Fig.…”

“…Such as, the integrated intensities ratio of the 2 [44]. In addition, UCNPs doped with Tm 3? or Nd 3? ions are also reported for temperature sensing with different response wavelength [45,46]. Qiu et al have explored a method to minimum heating effect in core-shell NaYF 4 :Yb,Tm@NaYF 4 :Yb,Nd nanoparticles, and reaches a high sensitivity of up to 1.55% K -1 [47].…”

Multipath optical thermometry realized in CaSc2O4: Yb3+/Er3+ with high sensitivity and superior resolution

“…Benefiting from such a unique optical property, UC materials have attracted much attention for the application of drug delivery, biological imaging, photodynamic therapy, photothermal therapy, three‐dimensional display, etc 5‐9 . In the past few years, UC materials have also been found to own outstanding temperature sensing properties which can afford a contactless thermometry in many special industries, such as coal mining, metal smelting, petrochemicals, biomedicine, and so on 10,11 . In particular, the fluorescence intensity ratio ( FIR ) between two thermally coupled energy levels of trivalent rare earth ions is considered to be a promising technology to provide fast and accurate optical thermometry, due to its rapid response capability, high spatial resolution, strong anti‐jamming ability, etc 12‐17 .…”

“…[5][6][7][8][9] In the past few years, UC materials have also been found to own outstanding temperature sensing properties which can afford a contactless thermometry in many special industries, such as coal mining, metal smelting, petrochemicals, biomedicine, and so on. 10,11 In particular, the fluorescence intensity ratio (FIR) between two thermally coupled energy levels of trivalent rare earth ions is considered to be a promising technology to provide fast and accurate optical thermometry, due to its rapid response capability, high spatial resolution, strong anti-jamming ability, etc. [12][13][14][15][16][17] Up to date, numerous trivalent rare earth ions are used for ratiometric thermometry, such as Er 3+ , Ho 3+ , Tm 3+ , Nd 3+ , and Eu 3+ .…”