Answers are grounded in this paper and cite their sources.
Oxygen-containing yttrium hydride thin films exhibit photochromic behavior: Transparent thin films reversibly switch from a transparent state to a photodarkened state after being illuminated with UV or blue light. From optical spectrophotometry and ellipsometry measurements of the transparent state and photodarkened state, it is concluded that the photochromic effect can be explained by the gradual growth, under illumination, of metallic domains within the initial wide-band-gap semiconducting lattice. This conclusion is supported by Raman measurements.
No takes yet. Share an insight, caveat, or question.
Montero et al. (2017) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: