Abstract
A cationic surfactant, cetyltrimethylammonium bromide, was used to prepare LaF3:Eu3+ nanocrystals via a hydrothermal route. The influences of post-annealing temperature on the size and morphology as well as on the photoluminescence (PL) properties were studied. It was found that the PL intensity was maximized when LaF3:Eu3+ nanocrystals were calcined at 600°C. By applying a time-resolved PL spectral analysis to the 5D0–7F1, 2 decay curves, we could conclude that at the annealing temperature the most of Eu3+ ions (94.6%) were successfully incorporated in a higher symmetric site in a LaF3 lattice structure and as a result engaged in the strong PL.
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