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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 NaYFsub.4:Smsup.3+ nano- and microcrystalline materials co-doped by Lasup.3+, Gdsup.3+, and Lusup.3+ 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 Lasup.3+ content (where LaFsub.3 is formed) have a β-NaYFsub.4 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 sup.4Gsub.5/2→sup.6Hsub.J transitions (J = 5/2-11/2) of Smsup.3+ ion. Increasing the samarium (III) content results in concentration quenching by dipole-dipole interactions, the optimum Smsup.3+concentration is found to be of 2%. Co-doping by non-luminescent Lasup.3+, Gdsup.3+ and Lusup.3+ ions leads to an increase in emission intensity. This effect was explained from the Smsup.3+ local symmetry point of view.
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