Photochromism of rare-earth metal-oxy-hydrides

Journal article (2017)

Authors

F. Nafezarefi ChemE/Materials for Energy Conversion and Storage - AS
H. Schreuders ChemE/Afdelingsbureau
B. Dam ChemE/Materials for Energy Conversion and Storage - AS
S. Cornelius ChemE/Materials for Energy Conversion and Storage - AS
Research Group
ChemE/Materials for Energy Conversion and Storage (AS) (TU Delft)
Copyright: © 2017 F. Nafezarefi, H. Schreuders, B. Dam, S. Cornelius
DOI: https://doi.org/10.1063/1.4995081
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Published Date

04-09-2017

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Materials for Energy Conversion and Storage

Abstract

Recently, thin films of yttrium oxy-hydride (YOxHy) 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 YOxHy. Compared to YOxHy, 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.

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