On the design of phosphors for high-temperature thermometry

Heyes, Andrew

doi:10.1016/j.jlumin.2009.03.041

Cited by 74 publications

(47 citation statements)

References 13 publications

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“…The quenching then takes place via the phononactivated crossing of the excited state and the charge transfer state [52] or by multi-phonon emission [53].…”

Section: +mentioning

confidence: 99%

Selecting Conversion Phosphors for White Light-Emitting Diodes

Smet

Parmentier

Poelman

2011

J. Electrochem. Soc.

696

501

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Light emitting diodes (LEDs) are on the verge of a breakthrough in general lighting, due to their rapidly improving efficiency. Currently, white LEDs with high color rendering are mainly based on wavelength conversion by one or more phosphor materials. This Review first describes how to quantify the quality of a light source, discussing the color rendering index (CRI) and alternative color quality indices. Then, six main criteria are identified and discussed, which should be fulfilled by a phosphor candidate to be considered for actual application in LEDs. These criteria deal with the shape and position of the emission and the excitation spectra, the thermal quenching behavior, the quantum efficiency, the chemical and thermal stability and finally with the occurrence of saturation effects. Based on these criteria, the most common dopant ions (broad-band emitting Eu AbstractLight emitting diodes (LEDs) are on the verge of a breakthrough in general lighting, due to their rapidly improving efficiency. Currently, white LEDs with high color rendering are mainly based on wavelength conversion by one or more phosphor materials. This Review first describes how to quantify the quality of a light source, discussing the color rendering index (CRI) and alternative color quality indices. Then, six main criteria are identified and discussed, which should be fulfilled by a phosphor candidate to be considered for actual application in LEDs. These criteria deal with the shape and position of the emission and the excitation spectra, the thermal quenching behavior, the quantum efficiency, the chemical and thermal stability and finally with the occurrence of saturation effects. Based on these criteria, the most common dopant ions (broad-band emitting Eu

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“…The quenching then takes place via the phononactivated crossing of the excited state and the charge transfer state [52] or by multi-phonon emission [53].…”

Section: +mentioning

confidence: 99%

Selecting Conversion Phosphors for White Light-Emitting Diodes

Smet

Parmentier

Poelman

2011

J. Electrochem. Soc.

696

501

View full text Add to dashboard Cite

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“…It works remotely with high detection sensitivity and spatial resolution in short acquisition times, even in biological fluids, strong electromagnetic fields and fast-moving objects. 19,61,[69][70][71][72][73] The thermal probes encompass organic dyes, ruthenium complexes, spin crossover NPs, polymers, LDHs, semiconductor QDs, and Ln 3+ -based materials. Apart from these simple systems, in which a single component acts as a temperature-responsive emitting centre, there are complex systems, in which the changes in the emission intensity and/or lifetime of the emitting state of a particular component are induced by a second one that is the real temperature responsive material.…”

mentioning

confidence: 99%

Thermometry at the nanoscale

et al. 2012

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Non-invasive precise thermometers working at the nanoscale with high spatial resolution, where the conventional methods are ineffective, have emerged over the last couple of years as a very active field of research. This has been strongly stimulated by the numerous challenging requests arising from nanotechnology and biomedicine. This critical review offers a general overview of recent examples of luminescent and non-luminescent thermometers working at nanometric scale. Luminescent thermometers encompass organic dyes, QDs and Ln 3+ ions as thermal probes, as well as more complex thermometric systems formed by polymer and organic-inorganic hybrid matrices encapsulating these emitting centres. Non-luminescent thermometers comprise of scanning thermal microscopy, nanolithography thermometry, carbon nanotube thermometry and biomaterials thermometry. Emphasis has been put on ratiometric examples reporting spatial resolution lower than 1 micron, as, for instance, intracellular thermometers based on organic dyes, thermoresponsive polymers, mesoporous silica NPs, QDs, and Ln 3+ -based up-converting NPs and b-diketonate complexes. Finally, we discuss the challenges and opportunities in the development for highly sensitive ratiometric thermometers operating at the physiological temperature range with submicron spatial resolution.

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“…Fortunately, there are various types of non-contact nanothermometry approaches, one of the most attractive of which is luminescence thermometry, based on the temperature-dependent emission intensity, lifetime value, band shape or position of emission bands of luminescent nanoparticles [7,8]. These methods offer relatively high detection sensitivity and spatial resolution in short acquisition time, even in fluids, strong electromagnetic fields and fast moving objects [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

New strategies invonving upconverting nanoparticles for determining moderate temperatures by luminescence thermometry

Savchuk

Carvajal

Pujol

et al. 2016

Journal of Luminescence

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Here we analyze alternative luminescence thermometry techniques to FIR, such as intensity ratio luminescence thermometry between the emission arising from two electronic levels that are not necessarily thermally coupled, but that show different evolutions with temperature, and lifetime luminescence nanothermometry in (Ho,Tm,Yb):KLu(WO 4 ) 2 and (Er,Yb):NaY 2 F 5 O nanoparticles. (Ho,Tm,Yb):KLu(WO 4 ) 2 nanoparticles exhibited a maximum relative sensitivity of 0.61 % K -1 , similar to that achievable in Er-doped systems, which are the upconverting systems presenting the highest sensitivity. From another side, (Er,Yb):NaY 2 F 5 O nanocrystals show great potentiality as thermal sensors at the nanoscale for moderate temperatures due to the incorporation of additional non-radiative relaxation mechanisms that shorten the emission lifetime generated by the oxygen present in the structure when compared to (Er,Yb):NaYF 4 nanoparticles exhibiting the highest upconversion efficiency. We used those nanoparticlesfor ex-vivo temperature determination by laser induced heating in chicken breast using lifetime-based thermometry. The results obtained indicate that these techniques might constitute alternatives to FIR with potential applications for the determination of moderate temperatures, with sensitivities comparable to those that can be achieved by FIR or even higher.

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On the design of phosphors for high-temperature thermometry

Cited by 74 publications

References 13 publications

Selecting Conversion Phosphors for White Light-Emitting Diodes

Selecting Conversion Phosphors for White Light-Emitting Diodes

Thermometry at the nanoscale

New strategies invonving upconverting nanoparticles for determining moderate temperatures by luminescence thermometry

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