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Keywords = aqueous colloidal solutions of Nd3+: LaF3 nanocrystals

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18 pages, 4316 KB  
Article
The Influence of Medium on Fluorescence Quenching of Colloidal Solutions of the Nd3+: LaF3 Nanoparticles Prepared with HTMW Treatment
by Elena Timofeeva, Elena Orlovskaya, Alexandr Popov, Artem Shaidulin, Sergei Kuznetsov, Alexandr Alexandrov, Oleg Uvarov, Yuri Vainer, Gleb Silaev, Mihkel Rähn, Aile Tamm, Stanislav Fedorenko and Yurii Orlovskii
Nanomaterials 2022, 12(21), 3749; https://doi.org/10.3390/nano12213749 - 25 Oct 2022
Cited by 5 | Viewed by 2222
Abstract
An original method was proposed to reduce the quenching of the NIR fluorescence of colloidal solutions of 0.1 at. % Nd3+: LaF3 nanoparticles (NPs) synthesized by aqueous co-precipitation method followed by hydrothermal microwave treatment. For this, an aqueous colloidal solution [...] Read more.
An original method was proposed to reduce the quenching of the NIR fluorescence of colloidal solutions of 0.1 at. % Nd3+: LaF3 nanoparticles (NPs) synthesized by aqueous co-precipitation method followed by hydrothermal microwave treatment. For this, an aqueous colloidal solution of NPs was precipitated by centrifugation and dissolved in the same volume of DMSO. The kinetics of static fluorescence quenching of Nd3+ donors of doped NPs dispersed in two solvents was analyzed to determine and to compare the concentrations of OH- quenching acceptors uniformly distributed throughout the volume of the NPs. The dependences of the relative fluorescence quantum yield φ of colloidal solutions on the concentration of OH- groups in the NPs were calculated and were also used to determine concentration of acceptors in the volume of NPs in different solvents. It was found that the concentration of OH- groups in NPs dispersed in DMSO is almost two times lower than in NPs dispersed in water. This gives an almost two-fold increase in the relative fluorescence quantum yield φ for the former. The sizes of synthesized NPs were monitored by common TEM and by applying a rapid procedure based on optical visualization of the trajectories of the Brownian motion of NPs in solution using a laser ultramicroscope. The use of two different methods made it possible to obtain more detailed information about the studied NPs. Full article
(This article belongs to the Special Issue Fluorescent Quantum Dot Nanomaterials)
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