Laser-induced photocoloration in molybdenum oxide thin films

M. F. Al-Kuhaili*, M. B. Mekki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Photocoloration refers to the induced change in the color of a transparent material exposed to a light source whose excitation wavelength is in the ultraviolet (UV) spectral range. Compared to conventional light sources, UV lasers can enhance this effect. The color change is significantly related to the structural and chemical properties of the irradiated material. This change leads to the appearance of an absorption band in the near-infrared range, with corresponding variations in the optical properties of the material. Molybdenum oxide has been demonstrated to exhibit a superior coloration response to UV radiation. In this work, MoO3 thin films were irradiated with a 325-nm UV laser. The dependence of the resulting absorption bands on the amorphous and substoichiometric nature of the films was investigated. Moreover, the valence states of molybdenum were analyzed, and the absorption bands were statistically resolved to elaborate on the coloration mechanisms.

Original languageEnglish
Article number161043
JournalJournal of Alloys and Compounds
StatePublished - 10 Dec 2021

Bibliographical note

Funding Information:
This work was supported by the Physics Department of King Fahd University of Petroleum and Minerals . Special thanks are due to Dr. Q. Drmosh for assistance with FESEM images.

Publisher Copyright:
© 2021 Elsevier B.V.


  • Adsorbed oxygen
  • Chromogenic
  • Intervalence charge transfer
  • Molybdenum oxide
  • Photochromic
  • Photocoloration
  • Polarons

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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