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Nafezarefi, Fahimeh
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article
Photochromism of rare-earth metal-oxy-hydrides
Abstract
<p>Recently, thin films of yttrium oxy-hydride (YO<sub>x</sub>H<sub>y</sub>) were reported to show an unusual color-neutral photochromic effect promising for application in smart windows. Our present work demonstrates that also oxy-hydrides based on Gd, Dy, and Er have photochromic properties and crystal structures similar to YO<sub>x</sub>H<sub>y</sub>. Compared to YO<sub>x</sub>H<sub>y</sub>, the optical bandgaps of the lanthanide based oxy-hydrides are smaller while photochromic contrast and kinetics show large variation among different cations. Based on these findings, we propose that cation alloying is a viable pathway to tailor the photochromic properties of oxy-hydride materials. Furthermore, we predict that the oxy-hydrides of the other lanthanides are also potentially photochromic.</p>