Temperature measurements inside an Er3+–Yb3+ co-doped fluoride crystal heated by a NIR laser diode and probed by red-to-green upconversion

Sayoud, A.; Jouart, J.P.; Trannoy, N.; Diaf, M.; Duvaut, Thierry

doi:10.1016/j.jlumin.2011.10.012

Cited by 16 publications

(4 citation statements)

References 7 publications

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“…As predicted by the Boltzmann law, we find [13] that the logarithmic values of intensities ratio vary in a linear way with the inverse of temperature (Fig. 5).…”

Section: Temperature Measurement By Photoluminescence Of Doped Microcsupporting

confidence: 74%

Temperature measurement based on photoluminescence of Er3+ doped Sr0.3Cd0.7F2 microcrystal coupled to scanning thermal microscopy

et al. 2015

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“…As predicted by the Boltzmann law, we find [13] that the logarithmic values of intensities ratio vary in a linear way with the inverse of temperature (Fig. 5).…”

Section: Temperature Measurement By Photoluminescence Of Doped Microcsupporting

confidence: 74%

Temperature measurement based on photoluminescence of Er3+ doped Sr0.3Cd0.7F2 microcrystal coupled to scanning thermal microscopy

et al. 2015

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“…For example, a NIR laser can be employed as both excitation and heating source to heat up the UCL material. A thermocouple is in contact with the material to monitor the temperature 205,206 while some groups used furnace 23,207 or cooling-heating systems to precisely measure temperatures. [208][209][210] Vetrone et al built a set-up by using a pump-probe and a fibercoupled confocal microscope connected to a high-resolution spectrometer.…”

Section: Characterization Of Stimulus Responsementioning

confidence: 99%

Stimuli responsive upconversion luminescence nanomaterials and films for various applications

2015

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Upconversion luminescence (UCL) refers to nonlinear optical processes, which can convert near-infrared photons to short-wavelength emission. Recent advances in nanotechnology have contributed to the development of photon upconversion materials as promising new generation candidates of fluorescent bioprobes and spectral converters for biomedical and optoelectronic applications. Apart from the remarkable photoluminescence of the materials under photon excitation, some UCL materials may exhibit intrinsic magnetic, ferroelectric, X-ray absorption properties, and so on. These interesting characteristics provide an opportunity for us to couple a single stimulus or multiple stimuli (electric field, magnetic field, X-ray, electron beam, temperature and pH, etc.) to various types of UCL materials. In this review, we will primarily focus on the stimuli responsive properties of UCL materials beyond light-matter interaction, which can aid both fundamental research and widespread applications of the materials. The mechanisms of the response to various stimuli in the UCL materials are discussed. This article will also highlight recent advances in the development of these materials in response to various stimuli and their applications in multimodal bioimaging, drug delivery and release, electro-optical devices, magnetic, temperature and pH sensors and multiple anti-counterfeiting inks. Lastly, we will present potential directions of future research and challenging issues which arise in expanding the applications of stimuli responsive UCL materials.

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“…As demonstrated above, NPs during the annealing process can be divided into amorphous, phase evolution, and the pure YAG state. The key UCLs centered at 556 and 546 nm are ascribed to stark splitting of 4 S 3/2 . − As shown in Figure S7, the 4 S 3/2 stark splitting produces the high and low substark levels as 4 S 3/2(1) and 4 S 3/2(2) , emitting 556 and 546 nm UCLs through 4 S 3/2(1) → 4 I 15/2 and 4 S 3/2(2) → 4 I 15/2 processes, respectively. Figure b records the UCL intensity ratios of 556 and 546 nm, which are used as a characteristic parameter to evaluate the phase evolution state of NPs in the annealing process.…”

Section: Resultsmentioning

confidence: 97%

Identification of Phase Evolution through Upconversion Emission in Flame-Made YAG:Yb³⁺/Er³⁺ Nanoparticles: Implications for the Optical Crystal-Phase Probe

Hu,

Song,

Yuan

et al. 2024

ACS Appl. Nano Mater.

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High-phase purity yttrium aluminum garnet (YAG) nanoparticles (NPs), which account for more than half of the market share in solid-state lasers, are crucial luminescent ceramic matrixes used in upconversion luminescence (UCL) applications. As is well known, the optical performance of YAG NPs is greatly influenced by their phase purity, necessitating a long-duration, hightemperature annealing process to eliminate intermediate impurity phases and subsequent inspection of the crystal phases using traditional methods such as XRD. Here, we report a convenient direct method to evaluate the phase state of YAG NPs by correlating the macroscopic UCL properties with the phase evolution process of YAG NPs, given the strong dependence of UCL on the host phase structure. Yb 3+ /Er 3+ -codoped YAG NPs were fabricated using flame spray pyrolysis (FSP), an efficient industrial mass production method. The UCL intensity ratios of 556 and 546 nm (I 556 /I 546 ) for Er 3+ ions are used as a key parameter to assess the YAG phase states. When the I 556 /I 546 ratio is larger than 1.80, FSP-prepared YAG:Yb 3+ /Er 3+ NPs undergo a complete phase transformation from amorphous to hexagonal YAlO 3 (YAH) and ultimately to cubic YAG, resulting in pure cubic YAG NPs with orange-to-green UCL color modulation. Our results offer an efficient optical crystal-phase probe applied for YAG and can enable the exploration of industrial phase monitoring for other optical materials.

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Temperature measurements inside an Er3+–Yb3+ co-doped fluoride crystal heated by a NIR laser diode and probed by red-to-green upconversion

Cited by 16 publications

References 7 publications

Temperature measurement based on photoluminescence of Er3+ doped Sr0.3Cd0.7F2 microcrystal coupled to scanning thermal microscopy

Temperature measurement based on photoluminescence of Er3+ doped Sr0.3Cd0.7F2 microcrystal coupled to scanning thermal microscopy

Stimuli responsive upconversion luminescence nanomaterials and films for various applications

Identification of Phase Evolution through Upconversion Emission in Flame-Made YAG:Yb³⁺/Er³⁺ Nanoparticles: Implications for the Optical Crystal-Phase Probe

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Temperature measurements inside an Er3+–Yb3+ co-doped fluoride crystal heated by a NIR laser diode and probed by red-to-green upconversion

Cited by 16 publications

References 7 publications

Temperature measurement based on photoluminescence of Er3+ doped Sr0.3Cd0.7F2 microcrystal coupled to scanning thermal microscopy

Temperature measurement based on photoluminescence of Er3+ doped Sr0.3Cd0.7F2 microcrystal coupled to scanning thermal microscopy

Stimuli responsive upconversion luminescence nanomaterials and films for various applications

Identification of Phase Evolution through Upconversion Emission in Flame-Made YAG:Yb3+/Er3+ Nanoparticles: Implications for the Optical Crystal-Phase Probe

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Product

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Identification of Phase Evolution through Upconversion Emission in Flame-Made YAG:Yb³⁺/Er³⁺ Nanoparticles: Implications for the Optical Crystal-Phase Probe