Aleksejs Zolotarjovs has successfully defended his Doctoral thesis in physics

We congratulate Aleksejs Zolotarjovs for successfully defending his doctoral thesis on “OPTICAL PROPERTIES OF PLASMA ELECTROLYTIC OXIDATION COATINGS ON ALUMINIUM ALLOY SURFACE” in physics.


Plasma Electrolytic Oxidation (PEO) is a process for producing thick (tens of microns), hard and chemically stable oxide coatings on metal surfaces. For decades, the process is under investigation by both scientific and industrial communities due to the low operational cost and ease of production. Due to the flexibility of the process, in the last couple of years, novel possibilities of PEO are quickly emerging: biocompatibility, antibacterial, photovoltaic, photocatalysis and other properties of the coatings are intensively studied. This work explores the different aspects of luminescence properties of PEO coatings which was not studied prior. Both process modification possibilities and practical applications are studied, with the focus on correlation between synthesis parameters and optical properties of the coatings. Three main topics are covered in this thesis:

1) Doping of the coating oxide structure with additives that alter the luminescence output

2) Production of coatings with dosimeter properties and evaluation of their performance

3) Synthesis of complex oxide structure of doped strontium aluminate thus creating persistent phosphorescent coatings

In combination with inherited PEO properties like outstanding hardness, great adhesion to the surface, chemical stability and quick production, the added luminescence properties can make this coating technology promising for practical applications in various fields of science and technology.