AI Article Synopsis
- Rare-earth oxyhydride thin films exhibit a reversible photochromic effect, changing color under ambient conditions when prepared through air-oxidation of REH dihydrides.
- The extent and speed of the optical change can be controlled by adjusting the O/H anion ratio and selecting different rare-earth cations.
- Larger ionic radius rare-earth elements result in oxyhydrides with enhanced optical contrast and quicker bleaching times, indicating a correlation between the photochromic mechanism and anion behavior.
Article Abstract
Rare-earth oxyhydride REO H thin films prepared by air-oxidation of reactively sputtered REH dihydrides show a color-neutral, reversible photochromic effect at ambient conditions. The present work shows that the O/H anion ratio, as well as the choice of the cation, allow to largely tune the extent of the optical change and its speed. The bleaching time, in particular, can be reduced by an order of magnitude by increasing the O/H ratio, indirectly defined by the deposition pressure of the parent REH. The influence of the cation (RE = Sc, Y, Gd) under comparable deposition conditions is discussed. Our data suggest that REs of a larger ionic radius form oxyhydrides with a larger optical contrast and faster bleaching speed, hinting to a dependency of the photochromic mechanism on the anion site-hopping.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8025701 | PMC |
| http://dx.doi.org/10.1021/acsphotonics.0c01877 | DOI Listing |
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