Phase transition behavior and optical properties of F/Mo co-doped VO2 for smart windows

Suzuki, Nonoko; Xue, Yibei; Hasegawa, Tetsuya; Yin, Shu

doi:10.1016/j.solmat.2022.112105

Cited by 18 publications

(6 citation statements)

References 47 publications

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“…The highest value of 10.2% was obtained for S4. It is noteworthy that although single-element Er-doped VO 2 does not provide the highest thermochromic properties, it is still better in improving T MIT , Tr lum , and Δ Tr sol altogether among reported results (see Table S1 ,,,,,,,,,− ). In Figure a, all films demonstrate a desirable optical modulation in the near IR region by showing an apparent change in the IR transmittance over MIT.…”

Section: Resultsmentioning

confidence: 81%

“…Ji et al studied the synergetic effect of Mg–Fe codoping for optimizing the thermochromic performance of VO 2 and obtained better Tr lum , but Mg–Fe codoping was not good to decrease T MIT or increase Δ Tr sol adequately . Other combinations of W–Eu, W–Ce, and F–Mo were also studied − but in vain, and thus VO 2 needs further attention to tailor its thermochromic properties.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Phase Transition and Thermochromic Performance of Vanadium Dioxide Thin Films via Erbium Doping

Azmat,

Yang,

Jin

et al. 2024

ACS Appl. Opt. Mater.

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Vanadium dioxide (VO 2 ) with a thermally driven phase transition is considered the most attractive thermochromic material for smart window applications. However, it is still challenging to optimize its phase transition temperature (T MIT ), luminous transmittance (Tr lum ), and solar modulation (ΔTr sol ) simultaneously for practical applications. In this work, erbium (Er)-doped VO 2 thin films were synthesized on the c-cut sapphire substrate to improve the thermochromic performance. At 4% single-element doping concentration, Er-doped VO 2 thin film significantly lowers the T MIT at a rate of ∼5 °C/at. % Er accompanied by an increase in both Tr lum and ΔTr sol . Moreover, Er-doped VO 2 films also preserved phase transition sharpness and excellent infrared modulation ability. The role of erbium doping and MIT mechanism are comprehensively explained by experimentation and DFT calculations unveiling the promising future of Er-doped VO 2 for next-generation energy-saving smart windows and optical switching devices.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Optimizing Phase Transition and Thermochromic Performance of Vanadium Dioxide Thin Films via Erbium Doping

Azmat,

Yang,

Jin

et al. 2024

ACS Appl. Opt. Mater.

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“…It means that although S4 has smaller Δ Tr sol , it can be beneficial for smart window applications in hot regions. The comparison of Tr lum and Δ Tr sol of single layer, ,− nanoporous, ,− nanoparticle, ,− and nanocomposite − films with this work is given in Figure S 4 in the Supporting Information. The Δ Tr sol of S2 is better than that of nanoparticles and even comparable with those of doped nanoporous and nanocomposite films, but the Tr lum of the prepared films is poor.…”

Section: Resultsmentioning

confidence: 99%

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Azmat,

Naseem,

Hajra

et al. 2024

ACS Appl. Energy Mater.

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VO 2 -based thin films are robust thermochromic materials in the pursuit of energy-efficient smart windows, but high metal−insulator transition temperature (T MIT ), low luminous transmittance (Tr lum ), and unsatisfactory solar modulation (ΔTr sol ) are primary hurdles. In this work, Sm-doped VO 2 thin films were reported for the first time deposited on a c-cut sapphire substrate using the hydrothermal method. Sm 3+ doping increases Tr lum , but it deteriorates ΔTr sol of VO 2 thin films. Compared with pure VO 2 , the 2 at % Sm doping level gives a good balance of thermochromic performance by increasing Tr lum from 23.5 to 28.2% over a little compromise in ΔTr sol from 8.9 to 7.3%. Moreover, due to the narrowing of E g1 on Sm doping, Tr sol of the M phase VO 2 consistently decreases to 22.1% at 6 at % Sm, which may be beneficial for smart window applications in hot regions where cooling is more demanding in summer than heating in winter. This study provides insight into VO 2 doping engineering via experimental and DFT studies, which may lead to prospects for advancing VO 2 nanofilms' thermochromic characteristics.

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“…Precise control of the synthesis technique is crucial for improving the properties of these materials. Several liquid-phase syntheses, including coprecipitation, hydro/solvothermal, and sol–gel methods, have been developed to synthesize submicrocrystals and nanocrystals. − Due to its interesting structural and optical features, AEu(MoO4)2 has been extensively studied as a phosphor material. ,− ,,,,, Among these methods, hydrothermal synthesis stands out as one of the most effective “soft chemistry” techniques because it can proceed under mild conditions to obtain crystals. In contrast, coprecipitation and sol–gel methods often require high-temperature treatments to crystallize the particles.…”

Section: Introductionmentioning

confidence: 99%

“…The hydrothermal method is highly advantageous in this regard. Under hydrothermal synthesis conditions, morphology and particle size can be easily controlled by parameters such as temperature, solution pH, organic cosolvent, and the molar ratio of raw materials. ,,,,, Additionally, Wu et al reported that the relationship between morphology and luminescence properties of KEu(MoO 4 ) 2 leads to improved luminescence intensity due to uniform morphology, larger particle size, and preferred orientation . Despite numerous references on morphology control of phosphor materials using the hydrothermal method, there is a lack of literature reporting the relationship between crystal growth, which produces specific morphologies, and luminescence properties.…”

Section: Introductionmentioning

confidence: 99%

Acquisition of Emissive Single-Crystalline AEu(MoO₄)₂ (A = Na, K, Rb, and Cs) Double Molybdates by One-Pot Hydrothermal Synthesis: Relationship between Particle Morphology and Photoluminescence Properties

Noda,

Hasegawa,

Goto

et al. 2024

Crystal Growth & Design

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Emissive double molybdates, AEu(MoO 4 ) 2 (A = Na, K, Rb, Cs), have garnered significant attention due to the diversity of crystal structures depending on the ionic radius of A + ions. However, the relationship between particle morphology and photoluminescence properties has not been reported for them. In this study, single-crystalline double molybdates were successfully synthesized by varying the molar ratio of A/Eu through a one-pot hydrothermal route without an annealing process. This approach allowed for the creation of a variety of crystal structures and particle morphologies. The two-dimensional (2D) layered materials of KEu(MoO 4 ) 2 , RbEu(MoO 4 ) 2 , and CsEu(MoO 4 ) 2 exhibit a luminescence intensity stronger than that of the scheelite-type NaEu(MoO 4 ) 2 with a three-dimensional (3D) framework structure because the layered structure can activate a higher concentration of Eu 3+ ions due to the suppression of migration of excitation energy between Eu 3+ ions. By varying the amount of A sources added, the morphologies were drastically changed, and their luminescence intensity was improved. Particularly, the particle morphologies of RbEu(MoO 4 ) 2 changed from rhombic nanoplate-like to rod-like and, finally, to hexagonal plate-like particles. The luminescence intensity achieved up to 5.8 times higher, attributed to the crystal growth along the in-plane direction of RbEu(MoO 4 ) 2 including the [EuO 8 ] layer.

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Phase transition behavior and optical properties of F/Mo co-doped VO2 for smart windows

Cited by 18 publications

References 47 publications

Optimizing Phase Transition and Thermochromic Performance of Vanadium Dioxide Thin Films via Erbium Doping

Optimizing Phase Transition and Thermochromic Performance of Vanadium Dioxide Thin Films via Erbium Doping

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Acquisition of Emissive Single-Crystalline AEu(MoO₄)₂ (A = Na, K, Rb, and Cs) Double Molybdates by One-Pot Hydrothermal Synthesis: Relationship between Particle Morphology and Photoluminescence Properties

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Phase transition behavior and optical properties of F/Mo co-doped VO2 for smart windows

Cited by 18 publications

References 47 publications

Optimizing Phase Transition and Thermochromic Performance of Vanadium Dioxide Thin Films via Erbium Doping

Optimizing Phase Transition and Thermochromic Performance of Vanadium Dioxide Thin Films via Erbium Doping

Samarium-Doped Vanadium Dioxide Thin Films to Modulate the Thermochromic Properties for Energy-Saving Smart Windows

Acquisition of Emissive Single-Crystalline AEu(MoO4)2 (A = Na, K, Rb, and Cs) Double Molybdates by One-Pot Hydrothermal Synthesis: Relationship between Particle Morphology and Photoluminescence Properties

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Acquisition of Emissive Single-Crystalline AEu(MoO₄)₂ (A = Na, K, Rb, and Cs) Double Molybdates by One-Pot Hydrothermal Synthesis: Relationship between Particle Morphology and Photoluminescence Properties