High quality multi-functional NaErF4 nanocrystals: structure-controlled synthesis, phase-induced multi-color emissions and tunable magnetic properties

Wang, Haibo; Yi, Zhigao; Rao, Ling; Liu, Hongrong; Zeng, Songjun

doi:10.1039/c3tc30796d

Cited by 37 publications

(26 citation statements)

References 50 publications

(43 reference statements)

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“…This is a unique result from the above reports where the dopant to host ratio has been responsible for the colour tuning. Phantom T 2 MR images at 4.7 T were also exhibited, demonstrating that these Er 3+ ‐based NCs are promising MRI contrast agents . In this report the strongest upconverted emission intensity was observed by doping 30 % Yb 3+ in to NaErF 4 NCs, exemplifying the application for in cellulo fluorescence imaging with excellent signal‐to‐noise ratio .…”

Section: Nanoparticle‐based Probes For Bimodal High Field Mr and Optisupporting

confidence: 54%

“…Wang et al. have proposed kinetic and thermodynamic growth mechanisms of NaErF 4 nanocrystals (NCs) when synthesizing multi‐functional NaErF 4 NCs with different shapes through a hydrothermal method, adjusting the F − contents and reaction temperature . The emission colour coming from the upconversion process was easily tuneable from red to green when comparing a cubic vs. hexagonal phase.…”

Section: Nanoparticle‐based Probes For Bimodal High Field Mr and Optimentioning

confidence: 99%

“…Phantom T 2 MR images at 4.7 Tw ere also exhibited, demonstrating that these Er 3 + -based NCsa re promising MRI contrast agents. [64] In this report the strongestu pconverted emission intensity was observed by doping 30 %Y b 3 + in to NaErF 4 NCs, exemplifying the application for in cellulo fluorescencei maging with excellent signal-to-noise ratio. [65] Colloidal NaYF 4 NCs with sizes of 20-30 nm were synthesized by Prasad and co-workersw ho additionallyc o-doped these with various lanthanide ions (Eu 3 + , Er 3 + ,Y b 3 + ,G d 3 + ).…”

Section: Multimodaln Anoparticle Probesmentioning

confidence: 99%

See 2 more Smart Citations

High‐Field MRI Contrast Agents and their Synergy with Optical Imaging: the Evolution from Single Molecule Probes towards Nano‐architectures

Harris

Biju²,

Parac-Vogt

2019

Chemistry A European J

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Contrast agents for magnetic resonance imaging have historically been based on paramagnetic metal complexes, particularly Gd3+ chelates, which tend to lose their contrast enhancement ability with increasing magnetic field strength. Emerging high‐field MRI applications require the development of novel contrast agents that exhibit high relaxation enhancement as a function of magnetic field strength. Paramagnetic ions such as Dy3+, Tb3+ or Ho3+ incorporated into supramolecular or inorganic nano‐architectures represent promising platforms for the development of high field MRI contrast agents. Furthermore, such platforms allow facile inclusion of multiple imaging modalities, therapeutic loading, and targeting vectors. This Minireview examines the application of contrast agents for high‐field MRI, which range from single molecules to nanoparticles. Approaches to create multimodal agents by combining high‐field MRI contrast properties with another imaging modality are also discussed.

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Section: Nanoparticle‐based Probes For Bimodal High Field Mr and Optisupporting

confidence: 54%

Section: Nanoparticle‐based Probes For Bimodal High Field Mr and Optimentioning

confidence: 99%

Section: Multimodaln Anoparticle Probesmentioning

confidence: 99%

See 1 more Smart Citation

High‐Field MRI Contrast Agents and their Synergy with Optical Imaging: the Evolution from Single Molecule Probes towards Nano‐architectures

Harris

Biju²,

Parac-Vogt

2019

Chemistry A European J

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“…Spins located near the surface tend to be slightly tilted, resulting in low magnetization value for small nanoparticles. Zeng et al reported the synthesis of NaErF 4 with different shapes and discussed the shape induced magnetic properties [177]. They speculated that the different shape anisotropy leads to the difference of magnetization, and consequently the rod-like morphology had highest magnetization.…”

Section: Ln 3+ (Other Than Gd 3+ )-Based Anisotropic Nanostructures Amentioning

confidence: 99%

Rare Earth Based Anisotropic Nanomaterials: Synthesis, Assembly, and Applications

Yan

Sun

Zhang

et al. 2015

Anisotropic Nanomaterials

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Rare earths (RE) refer to the lanthanide elements La-Lu together with Sc and Y. Conventionally, they have found applications in phosphors, magnets, catalysts, fuel cell electrodes/electrolyte. Here in this chapter, we discuss the synthesis, assembly and applications of rare earth based anisotropic nanomaterials. Regarding synthesis, the anisotropic growth behaviors of these nanocrystals are predominantly governed by their own unique crystal structures. Yet for wet-chemistry synthetic methods where a number of parameters could be finely tuned, the addition of particular coordination agents, templating agents or mineralizers has proven to be an effective way to direct the growth of nanocrystals into some anisotropic structures. Regarding applications, anisotropic nanomaterials, compared to their isotropic counterparts, often exhibit distinct properties. For example, the luminescence of anisotropic nanomaterials can display polarization and site-specific features. As for rare earth nanomaterials as magnetic resonance imaging (MRI) contrast agents, the high surface area of anisotropic nanostructures can give rise to superior performances. And for catalysis applications, anisotropic nanomaterials expose rich, highly active facets, which is of great importance for facet-selective catalytic reactions. In the chapter, we will start with introduction of the crystal structures of rare earth compounds, then briefly summarize the synthesis and assembly of rare earth anisotropic nanomaterials, and discuss their properties and applications in three realms, namely, luminescence, magnetism and catalysis.

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“…There are three common cross-relaxation (CR) processes among Er 3+ that account for the enhancement of RGR in Yb 3+ /Er 3+ codoped system. The first CR effect is the long-accepted and most popular mechanism22242526. According to Capobianco et al .’s report26, the enhanced red UC emission was obtained owing to a CR process [Er 3+ : 4 F 7/2 + 4 I 11/2 → 4 F 9/2 + 4 F 9/2 ], which directly populates the 4 F 9/2 state.…”

mentioning

confidence: 99%

Morphology evolution and pure red upconversion mechanism of β-NaLuF4 crystals

Lin

et al. 2016

Sci Rep

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A series of β-NaLuF4 crystals were synthesized via a hydrothermal method. Hexagonal phase microdisks, microprisms, and microtubes were achieved by simply changing the amount of citric acid in the initial reaction solution. Pure red upconversion (UC) luminescence can be observed in β-NaLuF4:Yb3+, Tm3+, Er3+ and Li+ doped β-NaLuF4:20% Yb3+, 1% Tm3+, 20% Er3+. Based on the rate equations, we report the theoretical model about the pure red UC mechanism in Yb3+/Tm3+/Er3+ doped system. It is proposed that the pure red UC luminescence is mainly ascribed to the energy transfer UC from Tm3+:3F4 → 3H6 to Er3+:4I11/2 → 4F9/2 and the cross-relaxation (CR) effect [Er3+:4S3/2 + 4I15/2 → 4I9/2 + 4I13/2] rather than the long-accepted mechanism [CR process among Er3+:4F7/2 + 4I11/2 → 4F9/2 + 4F9/2]. In addition, compared to the Li+-free counterpart, the pure red UC luminescence in β-NaLuF4:20% Yb3+, 1% Tm3+, 20% Er3+ with 15 mol% Li+ doping is enhanced by 13.7 times. This study provides a general and effective approach to obtain intense pure red UC luminescence, which can be applied to other synthetic strategies.

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High quality multi-functional NaErF4 nanocrystals: structure-controlled synthesis, phase-induced multi-color emissions and tunable magnetic properties

Cited by 37 publications

References 50 publications

High‐Field MRI Contrast Agents and their Synergy with Optical Imaging: the Evolution from Single Molecule Probes towards Nano‐architectures

High‐Field MRI Contrast Agents and their Synergy with Optical Imaging: the Evolution from Single Molecule Probes towards Nano‐architectures

Rare Earth Based Anisotropic Nanomaterials: Synthesis, Assembly, and Applications

Morphology evolution and pure red upconversion mechanism of β-NaLuF4 crystals

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