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Nosov, Viktor G.; Betina, Anna A.; Bulatova, Tatyana S.; Guseva, Polina B.; Kolesnikov, Ilya E.; Orlov, Sergey N.; Panov, Maxim S.; Ryazantsev, Mikhail N.; Bogachev, Nikita A.; Skripkin, Mikhail Yu; Mereshchenko, Andrey S.
Materials, 03/2023, Letnik: 16, Številka: 6Journal Article
The series of luminescent NaYF4:Sm3+ nano- and microcrystalline materials co-doped by La3+, Gd3+, and Lu3+ ions were synthesized by hydrothermal method using rare earth chlorides as the precursors and citric acid as a stabilizing agent. The phase composition of synthesized compounds was studied by PXRD. All synthesized materials except ones with high La3+ content (where LaF3 is formed) have a β-NaYF4 crystalline phase. SEM images demonstrate that all particles have shape of hexagonal prisms. The type and content of doping REE significantly effect on the particle size. Upon 400 nm excitation, phosphors exhibit distinct emission peaks in visible part of the spectrum attributed to 4G5/2→6HJ transitions (J = 5/2–11/2) of Sm3+ ion. Increasing the samarium (III) content results in concentration quenching by dipole–dipole interactions, the optimum Sm3+concentration is found to be of 2%. Co-doping by non-luminescent La3+, Gd3+ and Lu3+ ions leads to an increase in emission intensity. This effect was explained from the Sm3+ local symmetry point of view.
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