Lanthanide upconversion luminescence at the nanoscale: fundamentals and optical properties

Nadort, Annemarie; Zhao, Jiangbo; Goldys, Ewa M.

doi:10.1039/c5nr08477f

Cited by 306 publications

(195 citation statements)

References 197 publications

(497 reference statements)

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“…The energy difference between the two levels was abridged by the vibration energy of the host lattice. The second transfer is to promote the population from the intermediate 5 I 6 level to the emitting energy levels ( 5 S 2 ) by energy transfer (ET) from another excited Yb 3+ ion [52]. Once the 5 S 2 level is populated, the excited electron can release its energy by emitting green emissions.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Multicolor Core/Shell NaLuF4:Yb3+/Ln3+@CaF2 Upconversion Nanocrystals

Hao

Yang

et al. 2017

Nanomaterials

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The ability to synthesize high-quality hierarchical core/shell nanocrystals from an efficient host lattice is important to realize efficacious photon upconversion for applications ranging from bioimaging to solar cells. Here, we describe a strategy to fabricate multicolor core @ shell α-NaLuF4:Yb3+/Ln3+@CaF2 (Ln = Er, Ho, Tm) upconversion nanocrystals (UCNCs) based on the newly established host lattice of sodium lutetium fluoride (NaLuF4). We exploited the liquid-solid-solution method to synthesize the NaLuF4 core of pure cubic phase and the thermal decomposition approach to expitaxially grow the calcium fluoride (CaF2) shell onto the core UCNCs, yielding cubic core/shell nanocrystals with a size of 15.6 ± 1.2 nm (the core ~9 ± 0.9 nm, the shell ~3.3 ± 0.3 nm). We showed that those core/shell UCNCs could emit activator-defined multicolor emissions up to about 772 times more efficient than the core nanocrystals due to effective suppression of surface-related quenching effects. Our results provide a new paradigm on heterogeneous core/shell structure for enhanced multicolor upconversion photoluminescence from colloidal nanocrystals.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Multicolor Core/Shell NaLuF4:Yb3+/Ln3+@CaF2 Upconversion Nanocrystals

Hao

Yang

et al. 2017

Nanomaterials

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“…Through decades, different rheometric techniques have been developed for single-cell studies. [16] Moreover, stable and non-blinking emission enables prolonged measurements of the luminescence of a single UCP, required for specific studies. Active techniques impose an external force in order to produce a controlled deformation of the cell to measure its reaction to the applied stimulus.…”

Section: Introductionmentioning

confidence: 99%

Upconverting Nanorockers for Intracellular Viscosity Measurements During Chemotherapy

et al. 2019

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molecules and organelles inside the cell. It is also a reliable indicator of the cellular state, which can be used to detect the appearance and onset of different diseases, including cancer. [1] The precise knowledge of the intracellular viscosity can be used to evaluate the effects caused by different treatments at the single-cell level. Indeed, cytoplasmic viscosity is modified when cancer cells are subjected to a chemotherapy process, so that variations in the intracellular viscosity can be used to assess the evolution of the treatment. [2] The intracellular environment is a composite of water and a variety of proteins and organelles. One of the main protein components of the cytoplasm is the cytoskeleton. This 3D network composed of filamentous proteins is a highly mobile, viscoelastic, and flexible entity that controls the cellular mechanics. [3] Particularly, alterations produced in the intracellular viscosity due to drug administration are governed by the effect of the chemical on the cytoskeleton of the cell. There are three major types of cytoskeletal filaments: microtubules, actin filaments, and intermediate filaments. They differ from each other in their molecular structure, function, and mechanical properties. These filamentous proteins, and other associated proteins, have Chemicals capable of producing structural and chemical changes on cells are used to treat diseases (e.g., cancer). Further development and optimization of chemotherapies require thorough knowledge of the effect of the chemical on the cellular structure and dynamics. This involves studying, in a noninvasive way, the properties of individual cells after drug administration. Intracellular viscosity is affected by chemical treatments and it can be reliably used to monitor chemotherapies at the cellular level. Here, cancer cell monitoring during chemotherapeutic treatments is demonstrated using intracellular allocated upconverting nanorockers. A simple analysis of the polarized visible emission of a single particle provides a real-time readout of its rocking dynamics that are directly correlated to the cytoplasmic viscosity. Numerical simulations and immunodetection are used to correlate the measured intracellular viscosity alterations to the changes produced in the cytoskeleton of cancer cells by anticancer drugs (colchicine and Taxol). This study evidences the possibility of monitoring cellular properties under an external chemical stimulus for the study and development of new treatments. Moreover, it provides the biomedical community with new tools to study intracellular dynamics and cell functioning.

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“…Two types of fluorescent nanocrystals (NCs)-upconversion nanocrystals (UPNCs) and nanodiamond (ND)-have attracted particular interest for photonics applications in recent years [38]. Lanthanide ions doped into UPNCs enable emissions in the ultraviolet to visible spectral range due to the upconversion of two or more near-infrared excitation photons.…”

Section: Nanoparticle-doped Glasses and Fibersmentioning

confidence: 99%

Glass and Process Development for the Next Generation of Optical Fibers: A Review

Ballato

Ebendorff‐Heidepriem

Zhao

et al. 2017

Fibers

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Applications involving optical fibers have grown considerably in recent years with intense levels of research having been focused on the development of not only new generations of optical fiber materials and designs, but also on new processes for their preparation. In this paper, we review the latest developments in advanced materials for optical fibers ranging from silica, to semi-conductors, to particle-containing glasses, to chalcogenides and also in process-related innovations.

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Lanthanide upconversion luminescence at the nanoscale: fundamentals and optical properties

Cited by 306 publications

References 197 publications

Synthesis of Multicolor Core/Shell NaLuF4:Yb3+/Ln3+@CaF2 Upconversion Nanocrystals

Synthesis of Multicolor Core/Shell NaLuF4:Yb3+/Ln3+@CaF2 Upconversion Nanocrystals

Upconverting Nanorockers for Intracellular Viscosity Measurements During Chemotherapy

Glass and Process Development for the Next Generation of Optical Fibers: A Review

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