Machines. Technologies. Materials.
Vol. 20 (2026), Issue 3, pg(s) 123-126

MATERIALS

Photoluminescence properties of Sm3+-doped ZrO2–TiO2–Al2O3 coatings

  • 1 Bulgarian Academy of Sciences, Institute of Metal Science, Equipment and Technologies with Hydro- and Aerodynamics Centre “Acad. A. Balevski”, 67 “Shipchenski prohod” Blvd., 1574 Sofia, Bulgaria

Abstract

The emission spectrum of the ZrO2–TiO2–Al2O3–Sm2O3 coating was recorded at different excitation wavelengths. Under UV excitation (λₑₓ = 354 nm), broad band with a maximum around 420–440 nm was observed and can be associated with oxygen vacancies in ZrO2 together with Ti³⁺ centers. Weakly intense and narrower emission bands at 600 nm and 647 nm are assigned to the 5G5/2  7H7/2 and 5G5/2  7H9/2 transitions of Sm3+ ions. Under excitation with 404 nm the emission is dominated by defect levels in the oxide coating. The values of the chromaticity coordinates of the coating excited under 354 nm correspond to the pale pink color of emission (0.252, 0.272) and under 404 nm has orange color of emission (0.353, 0.370).

Keywords

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