Assessing Single Upconverting Nanoparticle Luminescence by Optical Tweezers

Rodríguez‐Sevilla, Paloma; Rodríguez-Rodríguez, Héctor; Pedroni, Marco; Speghini, Adolfo; Bettinelli, Marco; Solé, J. Garcı́a; Jaque, Daniel; Haro‐González, P.

doi:10.1021/acs.nanolett.5b01184

Cited by 58 publications

(58 citation statements)

References 47 publications

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“…Optical tweezer/trapping serves as a proactive option to selectively capture one or more nanoparticles from a colloidal suspension with time dependence ( Figure ) . A tightly focused laser beam in the optical tweezer system traps the particle in the optical potential well.…”

Section: Nanoparticles For Microscopic Detectionmentioning

confidence: 99%

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Zhou

Leaño

Liu³

et al. 2018

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Half a century after its initial emergence, lanthanide photonics is facing a profound remodeling induced by the upsurge of nanomaterials. Lanthanide-doped nanomaterials hold promise for bioapplications and photonic devices because they ally the unmatched advantages of lanthanide photophysical properties with those arising from large surface-to-volume ratios and quantum confinement that are typical of nanoobjects. Cutting-edge technologies and devices have recently arisen from this association and are in turn promoting nanophotonic materials as essential tools for a deeper understanding of biological mechanisms and related medical diagnosis and therapy, and as crucial building blocks for next-generation photonic devices. Here, the recent progress in the development of nanomaterials, nanotechnologies, and nanodevices for clinical uses and commercial exploitation is reviewed. The candidate nanomaterials with mature synthesis protocols and compelling optical uniqueness are surveyed. The specific fields that are directly driven by lanthanide doped nanomaterials are emphasized, spanning from in vivo imaging and theranostics, micro-/nanoscopic techniques, point-of-care medical testing, forensic fingerprints detection, to micro-LED devices.

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Section: Nanoparticles For Microscopic Detectionmentioning

confidence: 99%

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Zhou

Leaño

Liu³

et al. 2018

Small

139

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“…Thus, the EBT process is inherently efficient and becomes more prominent for higher Yb 3+ ‐ion concentration due to a reduced average distance between Yb 3+ and Er 3+ ions and an increased ratio of Yb 3+ ions per Er 3+ ion. This EBT and CR channels should subsequently suppress the population in excited levels of 2 H 11/2 and 4 S 3/2 , resulting in a decrease of green ( 2 H 11/2 ; 4 S 3/2 → 4 I 15/2 ) emission . The CR1 mechanism is enabling an increase of the red/green emission intensity ratio by populating the 4 I 13/2 state, which thereby populates the 4 F 9/2 state through phonon‐assisted ET from Yb 3+ ions.…”

Section: Resultsmentioning

confidence: 99%

Infrared‐to‐Visible Light Conversion in Er³⁺–Yb³⁺:Lu₃Ga₅O₁₂ Nanogarnets

et al. 2015

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Er(3+) -Yb(3+) co-doped Lu3 Ga5 O12 nanogarnets were prepared and characterized; their structural and luminescence properties were determined as a function of the Yb(3+) concentration. The morphology of the nanogarnets was studied by HRTEM. Under 488 nm excitation, the nanogarnets emit green, red, and near-infrared light. The decay curves for the ((4) S3/2 , (2) H11/2 ) and (4) F9/2 levels of the Er(3+) ions exhibit a non-exponential nature under resonant laser excitation and their effective lifetimes are found to decrease with an increase in the Yb(3+) concentration from 1.0 to 10.0 mol %. The non-exponential decay curves are well fitted to the Inokuti-Hirayama model for S=8, indicating that the mechanism of interaction for energy transfer between the optically active ions is of dipole-quadrupole type. Upon 976 nm laser excitation, an intense green upconverted emission is clearly observed by the naked eyes. A significant enhancement of the red-to-green intensity ratio of Er(3+) ions was observed with an increase in Yb(3+) concentration. The power dependence and the dynamics of the upconverted emission confirm the existence of two-photon upconversion processes for the green and red emissions.

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“…For this reason, Raman and photoluminescence tweezers are very appealing applications especially with regards to the study of biological samples as they may avoid the complications connected to the immobilization on a substrate. Moreover, spectroscopic methods are potentially extremely useful in the study of inorganic microand nanoparticles such as upconverting nanoparticles 53 , single-walled carbon nanotubes 32,61 (SWNTs), and graphene flakes 33 . For example when aiming at sorting on the basis of their spectroscopic characteristics, SWNTs may be dispersed in aqueous environment with the aid of surfactants 7 .…”

Section: Optical Trapping and Flake Metrology Of Hexagonal Boron Nitridementioning

confidence: 99%

Optical trapping and optical force positioning of two-dimensional materials

et al. 2018

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In recent years, considerable effort has been devoted to the synthesis and characterization of two-dimensional materials. Liquid phase exfoliation (LPE) represents a simple, large-scale method to exfoliate layered materials down to mono- and few-layer flakes. In this context, the contactless trapping, characterization, and manipulation of individual nanosheets hold perspectives for increased accuracy in flake metrology and the assembly of novel functional materials. Here, we use optical forces for high-resolution structural characterization and precise mechanical positioning of nanosheets of hexagonal boron nitride, molybdenum disulfide, and tungsten disulfide obtained by LPE. Weakly optically absorbing nanosheets of boron nitride are trapped in optical tweezers. The analysis of the thermal fluctuations allows a direct measurement of optical forces and the mean flake size in a liquid environment. Measured optical trapping constants are compared with T-matrix light scattering calculations to show a quadratic size scaling for small size, as expected for a bidimensional system. In contrast, strongly absorbing nanosheets of molybdenum disulfide and tungsten disulfide are not stably trapped due to the dominance of radiation pressure over the optical trapping force. Thus, optical forces are used to pattern a substrate by selectively depositing nanosheets in short times (minutes) and without any preparation of the surface. This study will be useful for improving ink-jet printing and for a better engineering of optoelectronic devices based on two-dimensional materials.

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Assessing Single Upconverting Nanoparticle Luminescence by Optical Tweezers

Cited by 58 publications

References 47 publications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Infrared‐to‐Visible Light Conversion in Er³⁺–Yb³⁺:Lu₃Ga₅O₁₂ Nanogarnets

Optical trapping and optical force positioning of two-dimensional materials

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Assessing Single Upconverting Nanoparticle Luminescence by Optical Tweezers

Cited by 58 publications

References 47 publications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Infrared‐to‐Visible Light Conversion in Er3+–Yb3+:Lu3Ga5O12 Nanogarnets

Optical trapping and optical force positioning of two-dimensional materials

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Infrared‐to‐Visible Light Conversion in Er³⁺–Yb³⁺:Lu₃Ga₅O₁₂ Nanogarnets