Color-neutral switchable mirrors based on magnesium-titanium thin films

Bao, Shanhu; Tajima, Kazuki; Yamada, Yuya; Okada, Masahisa; Yoshimura, Kazuyoshi

doi:10.1007/s00339-007-3991-z

Cited by 57 publications

(35 citation statements)

References 11 publications

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“…On the other hand, the Mg-Nb film mirror in the hydride state was color-neutral in the visible range. The optical transmittance and reflectance properties of Mg-Nb thin film mirrors were very similar to those of Mg-Ti system mirrors 8) and superior to Mg-Ni film mirrors in color neutrality. To evaluate the color neutrality, we calculated the chromaticity coordinates of samples from their transmission spectra in the hydride state and expressed them as an XYZ colorimetric system using an xy chromaticity diagram.…”

Section: Optical Propertiesmentioning

confidence: 72%

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Optical properties and degradation mechanism of magnesium-niobium thin film switchable mirrors

Bao

Tajima

Yamada

et al. 2008

J. Ceram. Soc. Japan

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Magnesium-niobium (Mg-Nb) thin films with a palladium (Pd) top layer were prepared on glass substrates by means of DC magnetron sputtering deposition, at room temperature. A Mg-Nb thin film with a Pd top layer can be switched to a transparent state from a mirror-like state by loading with 4% hydrogen gas. The optical properties of Mg(1-x)Nbx thin film switchable mirrors, with x ranging from 0.13 to 0.37, coated with a Pd layer were investigated using a UV-Vis-NIR optical photometer. The optical transmittance of the hydride states decreased with an increasing Nb fraction. Mg-Nb thin film switchable mirrors show color-neutral characteristics in the hydride state. The degradation mechanism of Mg-Nb thin films when loading hydrogen (H) gas was studied using X-ray photoelectroscopy (XPS) and scanning electron microscope (SEM) methods. We showed that Mg-Nb-H thin films are transparent, color-neutral semiconductors with a band cap of 2.2 ± 0.2 eV.

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Section: Optical Propertiesmentioning

confidence: 72%

“…8) Therefore, it is conceivable that the degradation mechanism of Mg-Nb film mirrors is the same as that of Mg-Ti system mirrors, where the oxidization of magnesium progresses during the hydrogen gas loading and unloading process. Figure 7 shows the XPS spectra of the Mg 1s states in asdeposited and degraded samples.…”

Section: Jcs-japanmentioning

confidence: 99%

Optical properties and degradation mechanism of magnesium-niobium thin film switchable mirrors

Bao

Tajima

Yamada

et al. 2008

J. Ceram. Soc. Japan

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“…These devices are based on the same principle: A MgNi x alloy (Wittwer et al 2004;Yoshimura et al 2006;Bao et al 2007a;Bao et al 2008b), MgTi (Bao et al 2007b) or MnNiMg (Slack et al 2006;Anders et al 2008) with a palladium Pd catalyst will turn transparent by taking up hydrogen. Similar all-solid-state switchable mirrors have been developed recently , Tajima et al 2008 as stated earlier in Ch.3.4.4 based on both Mg 4 Ni and H x WO 3 .…”

Section: Gasochromic Switchable Mirrorsmentioning

confidence: 99%

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Bætens

Jelle

Gustavsen

2010

Solar Energy Materials and Solar Cells

1,139

591

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A survey on prototype and currently commercial dynamic tintable smart windows has been carried out. The technologies of electrochromic, gasochromic, liquid crystal and electrophoretic or suspended-particle devices were examined and compared for dynamic daylight and solar energy control in buildings. Presently, state-of-the art commercial electrochromic windows seem most promising to reduce cooling loads, heating loads and lighting energy in buildings, where they have been found most reliable and able to modulate the transmittance up to 68 percent of the total solar spectrum. Their efficiency has already been proven in hot Californian climates, but more research is necessary to validate the products for colder climates, and to improve furthermore the commercial products in order to control the indoor climate in a more energy efficient way by reducing both heating and cooling loads.

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“…Since the discovery of its switchable optical properties in 1996, 1 study of rare-earth metal hydride films have emerged as an interesting research topic, with potential applications in smart windows, 2,3 hydrogen sensors, 4 and solar collectors. 5,6 The driving force for the effect was the switching induced by hydrogen uptake in the films, and the films were capped by a thin layer of Pd in order to speed up this reaction.…”

mentioning

confidence: 99%

Engineering of the band gap and optical properties of thin films of yttrium hydride

You

Mongstad

Mæhlen

et al. 2014

Applied Physics Letters

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Thin films of oxygen-containing yttrium hydride show photochromic effect at room temperature. In this work, we have studied structural and optical properties of the films deposited at different deposition pressures, discovering the possibility of engineering the optical band gap by variation of the oxygen content. In sum, the transparency of the films and the wavelength range of photons triggering the photochromic effect can be controlled by variation of the deposition pressure.

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Color-neutral switchable mirrors based on magnesium-titanium thin films

Cited by 57 publications

References 11 publications

Optical properties and degradation mechanism of magnesium-niobium thin film switchable mirrors

Optical properties and degradation mechanism of magnesium-niobium thin film switchable mirrors

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Engineering of the band gap and optical properties of thin films of yttrium hydride

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