Stable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range
Two series of stable aqueous colloidal solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> single-phase well-crystallized nanoparticles (NPs), possessing a fluorcerite structure with different activator concentrations in each series, were synthesized. A hydrothermal method involvin...
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MDPI AG
2021
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oai:doaj.org-article:64c10248bbcc438e807de8c7ac29dcc52021-11-25T18:30:19ZStable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range10.3390/nano111128472079-4991https://doaj.org/article/64c10248bbcc438e807de8c7ac29dcc52021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2847https://doaj.org/toc/2079-4991Two series of stable aqueous colloidal solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> single-phase well-crystallized nanoparticles (NPs), possessing a fluorcerite structure with different activator concentrations in each series, were synthesized. A hydrothermal method involving microwave-assisted heating (HTMW) in two Berghof speedwave devices equipped with one magnetron (type I) or two magnetrons (type II) was used. The average sizes of NPs are 15.4 ± 6 nm (type I) and 21 ± 7 nm (type II). Both types of NPs have a size distribution that is well described by a double Gaussian function. The fluorescence kinetics of the <sup>4</sup>F<sub>3/2</sub> level of the Nd<sup>3+</sup> ion for NPs of both types, in contrast to a similar bulk crystal, demonstrates a luminescence quenching associated not only with Nd–Nd self-quenching, but also with an additional Nd–OH quenching. A method has been developed for determining the spontaneous radiative lifetime of the excited state of a dopant ion, with the significant contribution of the luminescence quenching caused by the presence of the impurity OH– acceptors located in the bulk of NPs. The relative quantum yield of fluorescence and the fluorescence brightness of an aqueous colloidal solution of type II NPs with an optimal concentration of Nd<sup>3+</sup> are only 2.5 times lower than those of analogous Nd<sup>3+</sup>: LaF<sub>3</sub> single crystals.Alexandr PopovElena OrlovskayaArtem ShaidulinEkaterina VagapovaElena TimofeevaLeonid DolgovLyudmila IskhakovaOleg UvarovGrigoriy NovikovMihkel RähnAile TammAlexander VanetsevStanislav FedorenkoSvetlana EliseevaStephane PetoudYurii OrlovskiiMDPI AGarticleNd<sup>3+</sup>: LaF<sub>3</sub>nanoparticlesrare earth aqueous colloidal solutionshydrothermal microwave synthesisNIR fluorescenceradiative lifetimeChemistryQD1-999ENNanomaterials, Vol 11, Iss 2847, p 2847 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
Nd<sup>3+</sup>: LaF<sub>3</sub> nanoparticles rare earth aqueous colloidal solutions hydrothermal microwave synthesis NIR fluorescence radiative lifetime Chemistry QD1-999 |
| spellingShingle |
Nd<sup>3+</sup>: LaF<sub>3</sub> nanoparticles rare earth aqueous colloidal solutions hydrothermal microwave synthesis NIR fluorescence radiative lifetime Chemistry QD1-999 Alexandr Popov Elena Orlovskaya Artem Shaidulin Ekaterina Vagapova Elena Timofeeva Leonid Dolgov Lyudmila Iskhakova Oleg Uvarov Grigoriy Novikov Mihkel Rähn Aile Tamm Alexander Vanetsev Stanislav Fedorenko Svetlana Eliseeva Stephane Petoud Yurii Orlovskii Stable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range |
| description |
Two series of stable aqueous colloidal solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> single-phase well-crystallized nanoparticles (NPs), possessing a fluorcerite structure with different activator concentrations in each series, were synthesized. A hydrothermal method involving microwave-assisted heating (HTMW) in two Berghof speedwave devices equipped with one magnetron (type I) or two magnetrons (type II) was used. The average sizes of NPs are 15.4 ± 6 nm (type I) and 21 ± 7 nm (type II). Both types of NPs have a size distribution that is well described by a double Gaussian function. The fluorescence kinetics of the <sup>4</sup>F<sub>3/2</sub> level of the Nd<sup>3+</sup> ion for NPs of both types, in contrast to a similar bulk crystal, demonstrates a luminescence quenching associated not only with Nd–Nd self-quenching, but also with an additional Nd–OH quenching. A method has been developed for determining the spontaneous radiative lifetime of the excited state of a dopant ion, with the significant contribution of the luminescence quenching caused by the presence of the impurity OH– acceptors located in the bulk of NPs. The relative quantum yield of fluorescence and the fluorescence brightness of an aqueous colloidal solution of type II NPs with an optimal concentration of Nd<sup>3+</sup> are only 2.5 times lower than those of analogous Nd<sup>3+</sup>: LaF<sub>3</sub> single crystals. |
| format |
article |
| author |
Alexandr Popov Elena Orlovskaya Artem Shaidulin Ekaterina Vagapova Elena Timofeeva Leonid Dolgov Lyudmila Iskhakova Oleg Uvarov Grigoriy Novikov Mihkel Rähn Aile Tamm Alexander Vanetsev Stanislav Fedorenko Svetlana Eliseeva Stephane Petoud Yurii Orlovskii |
| author_facet |
Alexandr Popov Elena Orlovskaya Artem Shaidulin Ekaterina Vagapova Elena Timofeeva Leonid Dolgov Lyudmila Iskhakova Oleg Uvarov Grigoriy Novikov Mihkel Rähn Aile Tamm Alexander Vanetsev Stanislav Fedorenko Svetlana Eliseeva Stephane Petoud Yurii Orlovskii |
| author_sort |
Alexandr Popov |
| title |
Stable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range |
| title_short |
Stable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range |
| title_full |
Stable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range |
| title_fullStr |
Stable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range |
| title_full_unstemmed |
Stable Aqueous Colloidal Solutions of Nd<sup>3+</sup>: LaF<sub>3</sub> Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range |
| title_sort |
stable aqueous colloidal solutions of nd<sup>3+</sup>: laf<sub>3</sub> nanoparticles, promising for luminescent bioimaging in the near-infrared spectral range |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/64c10248bbcc438e807de8c7ac29dcc5 |
| work_keys_str_mv |
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1718411078888587264 |