A summary of new developments in phosphor thermometry

Beyrau, Frank; Fond, Benoît; Abram, Christopher

doi:10.1088/1361-6501/ac274e

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…To our knowledge, these particular aspects have not been reviewed before, setting this manuscript apart from other reviews that have been published in the past couple of years. [46][47][48][49][50][51][176][177][178][179][180][181][182][183][184][185][186][187][188][189] We start with a revision of the standardization rules, including the practical procedures to establish the calibration curve and the estimation of the errors in the thermometric parameter (Section 2). Next, a comprehensive summary of the theoretical background of ratiometric and time-resolved luminescent thermometers, including Boltzmann-, crossover-type, and energy-transfer-driven examples, is presented (Section 3).…”

Section: About This Perspectivementioning

confidence: 99%

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications

et al. 2023

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Luminescence (nano)thermometry is a remote sensing technique that relies on the temperature dependency of the luminescence features (e.g., bandshape, peak energy or intensity, and excited state lifetimes and risetimes) of a phosphor to measure temperature. This technique provides precise thermal readouts with superior spatial resolution in short acquisition times. Although luminescence thermometry is just starting to become a more mature subject, it exhibits enormous potential in several areas, e.g., optoelectronics, photonics, micro‐ and nanofluidics, and nanomedicine. This work reviews the latest trends in the field, including the establishment of a comprehensive theoretical background and standardized practices. The reliability, repeatability, and reproducibility of the technique are also discussed, along with the use of multiparametric analysis and artificial‐intelligence algorithms to enhance thermal readouts. In addition, examples are provided to underscore the challenges that luminescence thermometry faces, alongside the need for a continuous search and design of new materials, experimental techniques, and analysis procedures to improve the competitiveness, accessibility, and popularity of the technology

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Section: About This Perspectivementioning

confidence: 99%

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications

et al. 2023

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“…Approaches for the combined measurement of temperature and velocity in liquid or gaseous flows were recently reviewed by Someya [6]. In this context, TPs have attracted great interest in recent years due to their temperature range, wide spectrum of applications, their inert behavior and various luminescence properties [16,17].…”

Section: Phosphor Thermometry In Fluidsmentioning

confidence: 99%

Phosphor thermometry in heat transfer fluids and liquid organic hydrogen carrier systems using (Sr,Ca)SiAlN₃:Eu²⁺

Bollmann

Hickl

Preuster

et al. 2022

Meas. Sci. Technol.

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Temperature control in heat exchangers in reacting and non-reacting flows is of great importance for process optimization. In this context, phosphor thermometry is a promising technique for remote planar temperature sensing. The thermometry technique is based on exciting a luminescent material by a laser pulse and analysing the subsequent phosphorescence signal. A particular interesting application is chemical hydrogen storage using liquid organic hydrogen carrier (LOHC) systems. The knowledge of temperature fields is of special interest for the characterisation and understanding of hydrogen release from the carrier liquid. We investigated the luminescence properties of the thermographic phosphor (Sr,Ca)SiAIN3:Eu2+ (“SCASN:Eu2+”) dispersed in different heat transfer fluids, in particular LOHC systems, using a newly developed calibration cell. As heat transfer fluids may be excited to fluorescence by the laser as well, their absorption and florescence behaviour is studied to develop an excitation and detection concept for thermometry. We found strong absorption of the heat transfer fluids from the UV range to a wavelength of about 400 nm. In addition, fluorescence signals were found in the visible wavelength range, which can interfere with the phosphor emissions. These fluorescence signals should therefore be circumvented by utilizing the different luminescence decay times in the chosen detection strategy. For thermometry, the SCASN:Eu2+ particles were excited by a laser sheet of a 532 nm Nd:YAG laser. A spectrometer and photomultiplier tube (PMT) were used to detect the emission spectrum and phosphorescence decay time. Two temperature evaluation strategies were applied, which are based on either the intensity ratio of two spectral emission regions (two-colour laser-induced phosphorescence) or the phosphorescence decay time. The results obtained show an applicable measurement range between 293 K and 598 K for the intensity ratio method with a maximum relative sensitivity of 0.12 % K-1 at 293 K. For the phosphorescence decay time method, the phosphor allows measurements between 423 K and 598 K with a maximum relative sensitivity of 0.56 % K-1 at 598 K.

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Temperature imaging during the hydrogen release reaction from a liquid organic hydrogen carrier (LOHC) system using phosphor thermometry

Bollmann,

Bauer,

Keim

et al. 2024

Exp Fluids

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Liquid organic hydrogen carrier (LOHC) systems offer a particularly interesting option for chemical hydrogen storage. In order to characterize and understand the endothermal hydrogen release from the carrier liquid and to evaluate suitable catalyst materials, knowledge of the temperature fields in the dehydrogenation reactor is important. One suitable technique for planar temperature sensing in reacting systems is phosphor thermometry. It is based on the excitation of a luminescent material by a laser pulse and detection of the subsequent phosphorescence signal. We investigated the luminescence of the thermographic phosphor (Sr,Ca)SiAIN3:Eu2+ (“SCASN:Eu2+”) dispersed in the H0-DBT / H18-DBT LOHC system in a temperature range from 400 to 600 K. A measurement cell enables repeatable and homogeneous measurement conditions of the hydrogen release reaction. A catalytic plate was put inside the heated LOHC. Temperature fields during the hydrogen release reaction were measured for the first time using the phosphorescence decay time (PDT) and the phosphorescence intensity ratio method (PIR). As expected, a strong cooling at the catalyst surface during the endothermal hydrogen release reaction could be observed, which was quantified to be in the range of 40 K. Graphical abstract

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A summary of new developments in phosphor thermometry

Cited by 3 publications

References 14 publications

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications

Phosphor thermometry in heat transfer fluids and liquid organic hydrogen carrier systems using (Sr,Ca)SiAlN₃:Eu²⁺

Temperature imaging during the hydrogen release reaction from a liquid organic hydrogen carrier (LOHC) system using phosphor thermometry

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A summary of new developments in phosphor thermometry

Cited by 3 publications

References 14 publications

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications

Phosphor thermometry in heat transfer fluids and liquid organic hydrogen carrier systems using (Sr,Ca)SiAlN3:Eu2+

Temperature imaging during the hydrogen release reaction from a liquid organic hydrogen carrier (LOHC) system using phosphor thermometry

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Phosphor thermometry in heat transfer fluids and liquid organic hydrogen carrier systems using (Sr,Ca)SiAlN₃:Eu²⁺