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Phosphorescent coatings prepared by plasma electrolytic oxidation (2017 - 2019)
Last Update

Agreement No

Duration: 27.02.2017 -31.10.2019

Scientific manager: Dr.phys. Krisjanis Smits   

The proposed project foresees studies of luminescent coatings prepared by plasma electrolytic oxidation (PEO). Up to now, PEO coatings were mostly studied because of their tribological properties; however, PEO coatings also have good wear resistance, high hardness and are chemically stable therefore this technology can be applied to form protective coatings on metals. It is known that many oxide based materials exhibit good luminescent properties, however the luminescence of PEO produced oxide layers was not studied before. The first research in this direction was made by private company Elgoo tech in cooperation with Insitute of Solid State Physics University of Latvia.

During planed research project, PEO process will be used to produce luminous aluminium coatings. The analysis of accessible data indicates that PEO synthesis is a promising approach for production of materials with long lasting luminescence, for example SrAl2O4:Eu:Dy. The coatings prepared by PEO will be transparent in blue and UV range, therefore the final long lasting luminescence efficiency is expected to be several times higher than that of luminescent paints currently in use. In addition, coatings could serve as protection for metals since the durability of such coatings is expected to be better compared to paints.

Project updates (31.10.2017)

A certain project milestone has been recently achieved and luminescent coatings with sufficient luminescence intensity to be seen by the naked eye have been acquired. We will continue our work on intensity and luminescence afterglow parameter improvement and it certainly looks like we’re moving in the right direction although of course there’s tons of work still ahead of us.

A publication studying optical properties of strontium aluminate has been submitted and is being reviewed.

We’re also happy to announce that starting September Boriss Poļakovs and Krišjānis Auziņš have joined the project and are actively working to contribute to project’s successful ongoing.

Improvements on PEO reactor chamber (see photo) have been  made to insure better repeatability and constant results, allowing to study the coatings with greater detail and less errors. Technical improvements have also been made to aluminum samples – it is now possible to split the samples into smaller pieces with absolutely no potential damage to the coating.