Microwave-assisted hydrothermal synthesis of LaOF:Yb3+, Ho3+ nanorods with high thermoresponsive upconversion luminescence for thermometry

Nair, Govind B.; Tamboli, Sumedha; Kroon, R.E.; Swart, H.C.

doi:10.1016/j.mtchem.2023.101463

Cited by 8 publications

(8 citation statements)

References 47 publications

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“…Therefore, the same method was employed in this study to prepare the LaOF:Yb 3+ , Er 3+ UCNPs. However, the highlight of this study is the accuracy of the luminescence thermometry and the various experimental procedures practiced for eliminating the interference of laser-induced heating from the temperature-sensing measurements . Compared to previously published studies on LaOF:Yb 3+ , Er 3+ , this study has a more detailed discussion on the UCL and the luminescence nanothermometry, which is strongly supported by the experimental results.…”

Section: Introductionmentioning

confidence: 54%

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LaOF:Yb³⁺, Er³⁺ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

Nair,

Tamboli,

Dhoble

et al. 2023

ACS Appl. Nano Mater.

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Luminescence nanothermometers based on LaOF:Yb3+, Er3+ upconversion nanoparticles (UCNPs) were investigated in this study. The fluorescence intensity ratio (FIR) of the UCNPs was recorded in the visible (red) and near-infrared (NIR) regions at different temperatures. The impact of laser heating on the UCNPs was prevented by identifying the optimal operating conditions of the laser that could be used to record the FIRs without compromising the integrity of the UCNPs. The behavior of the UCNPs against the laser exposure time and power was analyzed to recognize the critical point of the laser power, below which laser heating of the UCNPs was negligible. This approach can be perceived as a benchmark for testing luminescent materials using nanothermometry.

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Section: Introductionmentioning

confidence: 54%

“…Microwave-assisted hydrothermal route was adopted to synthesize LaOF:0.05 Yb 3+ , x Er 3+ (0.001 ≤ x ≤ 0.05) UCNPs, as shown in Scheme . A detailed description of the synthesis protocols has been described elsewhere . Stoichiometric amounts of Yb(NO 3 ) 3 and Er(NO 3 ) 3 were mixed with La(NO 3 ) 3 solution without heating.…”

Section: Methodsmentioning

confidence: 99%

LaOF:Yb³⁺, Er³⁺ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

Nair,

Tamboli,

Dhoble

et al. 2023

ACS Appl. Nano Mater.

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“…Generally, all the decay curves can be well fitted by means of the double exponential formula: 47 I ( t ) = I 0 + A 1 exp − t / τ 1 + A 2 exp − t / τ 2 ,where I 0 is the luminescence intensity, A 1 and A 2 are constants of fitting parameters, t is the decay time, and τ 1 and τ 2 represent the fast and slow attenuation components for the biexponential decay curve, respectively. Ordinarily, it is recognized that a shorter τ 1 is related to nonradiative recombination and a longer τ 2 is related to radiative recombination.…”

Section: Resultsmentioning

confidence: 99%

UVB upconversion of LiYO₂:Ho³⁺,Gd³⁺ for application in luminescence thermometry

Zhao,

Li,

Shen

et al. 2023

Dalton Trans.

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“…It has been reported that Li + doping can also increase the luminescence intensity by breaking the local crystal field around rare earth ions and allowing the mixing of orbitals (f–d orbitals or second order perturbation in energy of Ho 3+ ), so that forbidden f–f transitions can be partly allowed . In recent works, many Ho 3+ ion codoped materials have been reported due to observation of interesting properties such as up-conversion, photovalence, energy-transfer/migration, Stark splitting, hyperfine splitting, and thermometry. − Their applications in biological works have also been reported. − …”

Section: Introductionmentioning

confidence: 99%

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

Srivastava,

Sahu,

Singh

et al. 2023

ACS Appl. Nano Mater.

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Rare earth-doped up-conversion materials have attracted considerable attention because of their various applications in solid-state lasers, color displays, bioimaging, and so forth. The emission of most up-conversion materials does not have enough intensity. However, this intensity can be increased by doping of sensitizers. Ho 3+ -doped compounds show green emission which have various applications. Here, we have reported how the intensity of green emission can be increased by doping of sensitizers Yb 3+ and Li + . In this work, we have chosen Y 2 O 3 as the host, Ho 3+ as the activator, and Yb 3+ as the sensitizer and have studied their up-conversion properties under 980 nm laser. The metal citrate-gel decomposition method provides a homogeneous solid solution formation. Green light intensity increases significantly by the increase in the Yb 3+ concentration as well as codoping of Li + . The green light intensity of Ho 3+ for Y 2 O 3 :10 at % Yb 3+ − 2 at % Ho 3+ −5 at % Li + system is 9 times more than that of the Y 2 O 3 :10 at % Yb 3+ −2 at % Ho 3+ system. Also, we have carried out down-conversion phenomena of Ho 3+ by excitation at 448 nm. Luminescence intensity of Ho 3+ in the visible range decreases with doping of Yb 3+ or Li + due to energy transfer from Ho 3+ to Yb 3+ . Interestingly, luminescence peaks corresponding to Yb 3+ (1000 nm) and Ho 3+ (1200 nm) in the NIR range are also observed under 448 nm excitation. Peak observed at 1000 nm is related to the quantum cutting phenomenon. The quantum efficiency is found to be 180% from calculations. Its applications are extensively shown in different areas such as security ink, consignment identification, and bioimaging of muscle and bone through the NIR light up-conversion process.

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Microwave-assisted hydrothermal synthesis of LaOF:Yb3+, Ho3+ nanorods with high thermoresponsive upconversion luminescence for thermometry

Cited by 8 publications

References 47 publications

LaOF:Yb³⁺, Er³⁺ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

LaOF:Yb³⁺, Er³⁺ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

UVB upconversion of LiYO₂:Ho³⁺,Gd³⁺ for application in luminescence thermometry

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

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Microwave-assisted hydrothermal synthesis of LaOF:Yb3+, Ho3+ nanorods with high thermoresponsive upconversion luminescence for thermometry

Cited by 8 publications

References 47 publications

LaOF:Yb3+, Er3+ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

LaOF:Yb3+, Er3+ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

UVB upconversion of LiYO2:Ho3+,Gd3+ for application in luminescence thermometry

Codoping of Yttria (Y2O3): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging

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LaOF:Yb³⁺, Er³⁺ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

LaOF:Yb³⁺, Er³⁺ Upconversion Nanophosphors Operating at Low Laser Powers for Nanothermometry Applications

UVB upconversion of LiYO₂:Ho³⁺,Gd³⁺ for application in luminescence thermometry

Codoping of Yttria (Y₂O₃): Ho–Yb Nanoparticles with Li Increase Emitted Green Light Intensity for Security Ink and Bioimaging