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Explore LECTURE Nr.3: Photochromic thin films - YHO, MoO3 and composite YHO/MoO3 / Dr.phys. Mārtiņš Zubkins with 1,090 views, 6 likes, and 0 comments. Experience the impact of this video content that has captured audience attention.

This lecture presents the design and characterisation of composite photochromic thin films combining oxygen-containing yttrium hydride (YHO) with molybdenum trioxide (MoO3), developed for light-sensitive optical detection and indicator applications. In addition to introducing the basic principles and types of photochromism, it focuses on a bilayer structure produced by reactive magnetron sputtering, which leverages light-induced hydrogen transfer from YHO into MoO3, forming molybdenum bronze (HxMoO3) and significantly enhancing optical darkening. Structural, morphological, optical, and chemical analyses (XRD, SEM, UV–Vis–NIR, XPS, NRA) show how MoO3 thickness and density influence contrast, switching speed, and hydrogen retention. The talk explains the hydrogen diffusion-driven switching mechanism and the partial reversibility of the colour change. It also addresses long-term stability considerations, revealing that gradual darkening can occur even without intentional illumination. These findings highlight the potential of YHO/MoO3 bilayers as functional photochromic coatings for optical sensing and visual indicators.

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