Abstract
Thermal annealing influence on properties of strontium–barium niobate (SBN) films doped with Eu 3+ has been studied using laser spectroscopic methods. The Stark splittings of the 5D 1 state and all the 7F J states are well resolved only in the spectra from the annealed films, whereas the spectra of Eu 3+ in the as-deposited film is similar to that in amorphous phases. Non-resonant fluorescence line narrowing (FLN) is observed only for the annealed film, which indicates a correlation between the energy levels of Eu 3+ in inhomogeneous line broadening. Annealing-induced crystallization of the as-deposited film also increases the 5D 0 fluorescence lifetime and allows hyperfine spectral hole burning.
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