The study of KCl-CuCl eutectic fused salt as a potential intermediate temperature heat transfer and storage medium

Etter, D.E.; Wiedenheft, C.J.

doi:10.1016/0165-1633(80)90037-4

Cited by 9 publications

(10 citation statements)

References 6 publications

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“…as compared to hybrid organic–inorganic metal halides. ,,, The obtained DSC results indicate a single thermal event for each sample, which has been assigned to the peritectic decompositions of K 2 CuCl 3 and K 2 CuBr 3 at 274 and 271 °C, respectively. These results are in a good agreement with the reported KX–CuX phase diagrams. , …”

Section: Resultssupporting

confidence: 92%

“…These results are in a good agreement with the reported KX−CuX phase diagrams. 54,55 The optical properties of as-synthesized K 2 CuX 3 were explored by photoluminescence spectroscopy. The photoluminescence excitation (PLE) and emission (PL) spectra for polycrystalline powders of K 2 CuCl 3 and K 2 CuBr 3 are provided in Figure 2a.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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K₂CuX₃ (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield

et al. 2020

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Recently, copper(I) halides have been gaining increased attention as highly luminescent nontoxic alternatives to lead halide perovskites for optoelectronic applications. Here, we report preparation of blue emitting, lead free, all-inorganic halides K2CuX3 (X = Cl, Br) through five synthetic methods including traditional solid-state and solution methods. The photoluminescence (PL) emission spectra of K2CuCl3 and K2CuBr3 exhibit narrow peaks centered at 392 and 388 nm with full widths at half-maximum (fwhm) values of ∼54 nm. The visible bright blue emission is corroborated by the remarkably high photoluminescence quantum yield (PLQY) values up to ∼97%. Furthermore, radioluminescence measurements on K2CuCl3 yield a bright peak at 404 nm under irradiation with X-rays at 200 kVp and 20 mA, which is optimal for use with PMTs and Si photomultipliers, suggesting a strong potential of this family for radiation detection applications. Based on our combined experimental and computational investigations, the origin of the efficient luminescence in K2CuX3 is attributed to the high stability self-trapped excitons (STE) formed in the one-dimensional anionic ∞ 1[CuX3]2– chains. Advantageously, K2CuX3 demonstrate improved air- and photostability compared to the previously reported copper(I) halides. The discovery of highly efficient and high stability light emitters based on earth-abundant copper(I) halides paves the way for their potential practical applications.

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Section: Resultssupporting

confidence: 92%

Section: ■ Results and Discussionmentioning

confidence: 99%

K₂CuX₃ (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield

et al. 2020

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“…FTSalt contains data on all the pure salts except the chlorides of copper (CuCl, CuCl 2 ). For systems involving these compounds, data had to be found in the literature-e.g., as in the case of Etter and Weidenheft's work with KCl-CuCl eutectic [66]. An older reference, the work of Sandonnini, was consulted, as well; the eutectic melting point data of other systems was found to compare well with FactSage, so data from this reference are also included here [67].…”

Section: Literature Sourcesmentioning

confidence: 99%

Thermal energy storage using chloride salts and their eutectics

Myers

Goswami

2016

Applied Thermal Engineering

223

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Achieving the goals of the U.S. Department of Energy (DOE) Sunshot initiative requires 1) higher operating temperatures for concentrating solar power (CSP) plants to increase theoretical efficiency, and 2) effective thermal energy storage (TES) strategies to ensure dispatchability. Current inorganic salt-based TES systems in large-scale CSP plants generally employ molten nitrate salts for energy storage, but nitrate salts are limited in application to lower temperatures-generally, below 600°C. These materials are sufficient for parabolic trough power plants, but they are inadequate for use at higher temperatures. At the higher operating temperatures achievable in solar power tower-type CSP plants, chloride salts are promising candidates for application as TES materials, owing to their thermal stability and generally lower cost compared to nitrate salts. In light of this, a recent study was conducted, which included a preliminary survey of chloride salts and binary eutectic systems that show promise as high temperature TES media. This study provided some basic information about the salts, including phase equilibria data and estimates of latent heat of fusion for

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“…From the KCl-CuCl phase diagram presented in [10], this percentage produces a liquidus temperature of approximately 245 °C. Commercially available CuCl beads of 99.99% purity (Sigma-Adlrich) were used, and kept in storage under vacuum until use.…”

Section: Methodsmentioning

confidence: 99%

UV emission on a Si substrate: Optical and structural properties of γ‐CuCl on Si grown using liquid phase epitaxy techniques

Cowley

Foy

Danilieuk

et al. 2009

Physica Status Solidi (a)

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Considerable research is being carried out in the area of wide band gap semiconductor materials for light emission in the 300–400 nm spectral range. Current materials being used for such devices are typically based on II–VI and III‐nitride compounds and variants thereof. However, one of the major obstacles to the successful fabrication of III‐N devices is lattice mismatch‐induced high dislocation densities for epitaxially grown layers on non‐native substrates. γ‐CuCl is a direct bandgap material and an ionic wide bandgap I–VII semiconductor with a room temperature free exciton binding energy of ∼190 meV (compared to ∼25 meV and ∼60 meV for GaN and ZnO, respectively) and has a band gap of 3.4 eV (λ ∼ 366 nm). The lattice constant of γ‐CuCl (0.541 nm) is closely matched to that of Si (0.543 nm). This could, in principle, lead to the development of optoelectronic systems based on CuCl grown on Si. Research towards this end has successfully yielded polycrystalline γ‐CuCl on Si(100) and Si(111) using vacuum‐based deposition techniques [1]. We report on developments towards achieving single crystal growth of CuCl from solution via Liquid Phase Epitaxy (LPE) based techniques. Work is being carried out using alkali halide flux compounds to depress the liquidus temperature of the CuCl below its solid phase wurtzite‐zincblende transition temperature (407 °C [2]) for solution based epitaxy on Si substrates. Initial results show that the resulting KCl flux‐driven deposition of CuCl onto the Si substrate has yielded superior photoluminescence (PL) and X‐ray excited optical luminescence (XEOL) behavior relative to comparitively observed spectra for GaN or polycrystalline CuCl. This enhancement is believed to be caused by an interaction between the KCl and CuCl material subsequent to the deposition process, perhaps involving a reduction in Cl vacancy distributions in CuCl. This paper presents a detailed discussion of a CuCl LPE growth system as well as the characterization of deposited materials using X‐ray diffraction (XRD), room temperature and low temperature PL, and XEOL. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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The study of KCl-CuCl eutectic fused salt as a potential intermediate temperature heat transfer and storage medium

Cited by 9 publications

References 6 publications

K₂CuX₃ (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield

K₂CuX₃ (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield

Thermal energy storage using chloride salts and their eutectics

UV emission on a Si substrate: Optical and structural properties of γ‐CuCl on Si grown using liquid phase epitaxy techniques

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The study of KCl-CuCl eutectic fused salt as a potential intermediate temperature heat transfer and storage medium

Cited by 9 publications

References 6 publications

K2CuX3 (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield

K2CuX3 (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield

Thermal energy storage using chloride salts and their eutectics

UV emission on a Si substrate: Optical and structural properties of γ‐CuCl on Si grown using liquid phase epitaxy techniques

Contact Info

Product

Resources

About

K₂CuX₃ (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield

K₂CuX₃ (X = Cl, Br): All-Inorganic Lead-Free Blue Emitters with Near-Unity Photoluminescence Quantum Yield