Sidorov I. D.1, Minnebaev T. M.1, Oleynikova E. I.1, Nizamutdinov A. S.1, Pudovkin M. S.1, Gafurov M. R.1, Nikitina Y. O. 2, Demina A. Y.2, Petrakova N. V.2, Komlev V. S.2
1Kazan Federal University, Institute of Physics, Kazan, Russia
2Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia
Email: Sidorov.I.D@mail.ru
The use of calcium phosphates as a basis for prosthetic materials for musculoskeletal injuries and luminescent probes is a promising direction because these compounds correspond to the mineral composition of bone. The results of a study of the spectral and luminescence decay of Eu3+ ions in hydroxyapatite and tricalcium phosphate matrices after synthesis and after heat treatment at 1573 K in air are discussed. A study of luminescence using a UV laser revealed lines characteristic of Eu3+ in both materials: the 5D0->7F0 and 5D0->7F2 transitions have the highest line intensity. Heat treatment led to a change in the spectral and kinetic characteristics: a significant effect on the shape of spectral lines and lifetimes was found. The luminescence decay of the samples at a wavelength of 622.7 nm before heat treatment is biexponential, which indicates the presence of nonequivalent positions of Eu3+ ions in the matrices. For a hydroxyapatite sample, annealing leads to the resolution of Stark components and intense luminescence at a wavelength of 573.7 nm, which indicates, the luminescence lifetime increases. For a tricalcium phosphate sample, annealing also leads to the resolution of Stark components in the luminescence spectrum, the luminescence decay becomes single-exponential with higher luminescence lifetime. Keywords: hydroxyapatite, tricalcium phosphate, Eu3+ ion, luminescence, luminescence decay, nonequivalent positions of Eu3+.
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