A survey of phosphors novel for thermography

Brübach, J.; Kissel, T.; Frotscher, Michael; Euler, M.; Albert, Barbara; Dreizler, Andreas

doi:10.1016/j.jlumin.2010.10.017

Cited by 54 publications

(19 citation statements)

References 17 publications

(18 reference statements)

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“…fluorophores or phosphors) with PL in the visible spectral range (Fig. 1c) that are deposited onto, or incorporated into, the object of interest as temperature probes [8][9][10][11][12][13][14][15][16] . To probe an object's temperature, the luminophore is then excited by an ultraviolet or visible (UV-Vis) pulsed source (e.g.…”

mentioning

confidence: 99%

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

Yakunin¹,

Benin²,

Shynkarenko³

et al. 2019

Nat. Mater.

277

258

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bolometric detectors, owing to advancements in MEMS-technologies (Micro-Electro-Mechanical Systems) 6,7 , have already entered the consumer electronics market, and are able to record thermal images with both high speed and high resolution. However, their thermographic performance, based on measurements of IR radiation intensity, is inherently limited by the transparency and emissivity/reflectivity of an observed object and, more importantly, by any material and medium (window, coating, matrix, solvent etc.) situated within the path between the detector and an object ( Fig. 1). As one of the major consequences, IR thermography cannot be easily combined with conventional optical microscopy or other enclosed optical systems such as cryostats or microfluidic cells.An alternative method for remote thermography, which is unhindered by enclosures or IRabsorptive media, utilizes temperature sensitive luminophores (i.e. fluorophores or phosphors) with PL in the visible spectral range (Fig. 1c) that are deposited onto, or incorporated into, the object of interest as temperature probes [8][9][10][11][12][13][14][15][16] . To probe an object's temperature, the luminophore is then excited by an ultraviolet or visible (UV-Vis) pulsed source (e.g. laser or light-emitting diode) and the temperature-dependent PL lifetime decay is then analyzed by time-resolving detectors.This PL-lifetime approach exhibits several benefits: the excitation power and, consequently the PL intensity, can be adjusted to a value appropriate for the dynamic range of the detector.Additionally, the use of UV-Vis light, rather than mid-to long-wavelength IR radiation, allows for the direct integration of this method with conventional optical spectroscopy and microscopy applied in biological studies and materials research. Furthermore, higher spatial resolutions can be obtained with visible light (400-700 nm) as the diffraction-limit is ca. 20-times sharper than for LWIR (7-14 µm); this potentially extends the utility of remote thermography to intracellular, in vitro, and in vivo studies 17 .

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mentioning

confidence: 99%

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

Yakunin¹,

Benin²,

Shynkarenko³

et al. 2019

Nat. Mater.

277

258

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“…(1)) we calculated b 2 (L) in the superposition model [18] taking into account the temperature variations of the coordinates of 8 oxygen ions nearest to the rare earth impurity. To find b 2 (L) we used the expression for and the values of intrin sic parameters of Gd 3+ quoted in [21]: (2) Here, b 2p = -1.289 × 10 4 MHz is the contribution of the point charge of O 2at the distance R 0 = 2.34 Å and b 2s = 6.892 × 10 3 MHz is the contribution of the over lap and covalence, k i (θ) = n/2(3cos 2 θ i -1) are the coordination factors [18]. The ligands nearest to Gd 3+ are separated into two quartets with equivalent contri (5) -2757 (1 butions to , so that i = 1, 2 and n = 4.…”

Section: Temperature Dependence Of For Gd 3+ and Eu 2+ In Cawomentioning

confidence: 99%

“…Spectroscopic studies of crystals with the scheelite (CaWO 4 ) structure with an impurity of rare earth met als are stimulated by their wide use in practice [1][2][3]. The efficiency of devices based on these materials largely depends on the phonon spectrum, which affects both the relaxation characteristics and the posi tions of the impurity energy levels [4][5][6][7].…”

mentioning

confidence: 99%

Spin-phonon and lattice contributions to the ground-state splitting of Gd3+ and Eu2+ in scheelite crystals

Gorlov

2015

Phys. Solid State

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“…Thermographic phosphors are typically made from crystals doped with rare earth metals -ruby, and europium-doped Yttrium oxide are good examples that are commonly used [24].…”

Section: Thermographic Phosphorsmentioning

confidence: 99%

Identification of Key Temperature Measurement Technologies for the Enhancement of Product and Equipment Integrity in the Light Controlled Factory

Ross-Pinnock

Maropoulos

2014

Procedia CIRP

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Thermal effects in uncontrolled factory environments are often the largest source of uncertainty in large volume dimensional metrology. As the standard temperature for metrology of 20˚C cannot be achieved practically or economically in many manufacturing facilities, the characterisation and modelling of temperature offers a solution for improving the uncertainty of dimensional measurement and quantifying thermal variability in large assemblies.Technologies that currently exist for temperature measurement in the range of 0-50˚C have been presented alongside discussion of these temperature measurement technologies' usefulness for monitoring temperatures in a manufacturing context. Particular aspects of production where the technology could play a role are highlighted as well as practical considerations for deployment.Contact sensors such as platinum resistance thermometers can produce accuracy closest to the desired accuracy given the most challenging measurement conditions calculated to be ~0.02˚C. Non-contact solutions would be most practical in the light controlled factory (LCF) and semi-invasive appear least useful but all technologies can play some role during the initial development of thermal variability models. Main textIn large volume metrology, thermal effects make a significant contribution to the uncertainty of measurements. Large structures that are often 20 m in length or greater are currently being assembled in factory environments where there can be thermal gradients of around 3-5˚C from floor to ceiling at any given time. Over a 24 hour cycle, the variation in ambient temperature can be as much as 15˚C.Whilst dimensional measurements in industry are sometimes taken alongside ambient temperature measurements which are used for linear scaling within the metrology software, this is often a sole measurement at one point in space, at one instance.One potential solution to the problem of thermally induced uncertainty is to model the thermal characteristics of the measurand. This can be achieved by monitoring the temperature and using this data to update a computational model that can more accurately predict the thermal and gravitational effects of the environment. The computational model makes use of the nominal CAD geometry of the measurand, alongside finite element analysis and tolerancing software.

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A survey of phosphors novel for thermography

Cited by 54 publications

References 17 publications

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

High-resolution remote thermometry and thermography using luminescent low-dimensional tin-halide perovskites

Spin-phonon and lattice contributions to the ground-state splitting of Gd3+ and Eu2+ in scheelite crystals

Identification of Key Temperature Measurement Technologies for the Enhancement of Product and Equipment Integrity in the Light Controlled Factory

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