Optical Properties of Afterglow Nanoparticles : ,  Capped with Polyethylene Glycol

Yoshimura, Fumitaka; Ishizaki, M.; Wakai, Fumihiro; Hara, Masahiko; Odawara, Osamu; Wada, Hiroo

doi:10.1155/2012/814745

Cited by 11 publications

(12 citation statements)

References 30 publications

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“…A drawback of liquid-phase laser ablation for materials processing is the tendency to evoke formation of a large number of surface defects during the course of target bombardment because the laser irradiation can induce changes to the surface chemistry. These surface defects can act as traps for excitation energy and result in decreased emission efficiencies of the nanophosphors …”

Section: Synthetic Strategies For Lanthanide-activated Phosphorsmentioning

confidence: 99%

“…These surface defects can act as traps for excitation energy and result in decreased emission efficiencies of the nanophosphors. 139 Park et al have reported a laser ablation method for the preparation of Y 3 Al 5 O 12 :Ce 3+ in deionized water. 140 In their study, they used a focused pulsed laser (Nd:YAG, 355 nm, repetition rate: 30 Hz, pulse width: 5−7 ns, and maximum output: 300 mW) to irradiate a YAG:Ce 3+ target.…”

Section: Synthesis Of Nanophosphorsmentioning

confidence: 99%

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Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

et al. 2017

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The synthesis of lanthanide-activated phosphors is pertinent to many emerging applications, ranging from high-resolution luminescence imaging to next-generation volumetric full-color display. In particular, the optical processes governed by the 4f-5d transitions of divalent and trivalent lanthanides have been the key to enabling precisely tuned color emission. The fundamental importance of lanthanide-activated phosphors for the physical and biomedical sciences has led to rapid development of novel synthetic methodologies and relevant tools that allow for probing the dynamics of energy transfer processes. Here, we review recent progress in developing methods for preparing lanthanide-activated phosphors, especially those featuring 4f-5d optical transitions. Particular attention will be devoted to two widely studied dopants, Ce and Eu. The nature of the 4f-5d transition is examined by combining phenomenological theories with quantum mechanical calculations. An emphasis is placed on the correlation of host crystal structures with the 5d-4f luminescence characteristics of lanthanides, including quantum yield, emission color, decay rate, and thermal quenching behavior. Several parameters, namely Debye temperature and dielectric constant of the host crystal, geometrical structure of coordination polyhedron around the luminescent center, and the accurate energies of 4f and 5d levels, as well as the position of 4f and 5d levels relative to the valence and conduction bands of the hosts, are addressed as basic criteria for high-throughput computational design of lanthanide-activated phosphors.

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Section: Synthetic Strategies For Lanthanide-activated Phosphorsmentioning

confidence: 99%

Section: Synthesis Of Nanophosphorsmentioning

confidence: 99%

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

et al. 2017

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“…This low dispersion then allows close interaction of the precursors in that limited space, thereby becoming microreaction vessels. This results in small particle size, but the choice and purity of the surfactant are crucial . 5) Solvothermal approaches involve solvents like water (hydrothermal) before the dissolved reactants are heated to achieve reaction.…”

Section: Nanophosphors For Microledsmentioning

confidence: 99%

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Zhou

Leaño

Liu³

et al. 2018

Small

133

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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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“…Previously, we capped nanoparticles with PEG by physical adsorption. [34][35][36] However, the force of physical adsorption would be weaker than that of chemical adsorption. In this study, chemical adsorption was achieved by reaction with a silane coupling agent.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of Y₂O₃:Er,Yb upconversion nanoparticles prepared by laser ablation in water

Kobayashi¹,

Fujii²,

Nunokawa³

et al. 2014

Jpn. J. Appl. Phys.

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Y 2 O 3 :Er,Yb upconversion nanoparticles were prepared by laser ablation in liquid and capped with poly(ethylene glycol) (PEG). A Nd:YAG green laser with nanosecond pulse duration was used. Capping was carried out by a two-step process. The first step is surface modification using a silane coupling agent, (3-aminopropyl)triethoxysilane (APTES), to aminate the surface of nanoparticles. The second step was the conjugation of PEG chains to the surface by amido binding reaction between the surface amino groups and activated esters connected to PEG. The prepared upconversion nanoparticles were highly crystalline polycrystals, the particle size of which was approximately 20 nm. Dopants in phosphor nanoparticles were not removed by laser irradiation. The spectra of PEG-capped nanoparticles were almost the same as those of uncapped nanoparticles. The capped nanoparticles would be useful for biomedical applications.

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Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

Cited by 11 publications

References 30 publications

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Surface modification of Y₂O₃:Er,Yb upconversion nanoparticles prepared by laser ablation in water

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Optical Properties of Afterglow Nanoparticles : , Capped with Polyethylene Glycol

Cited by 11 publications

References 30 publications

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Lanthanide-Activated Phosphors Based on 4f-5d Optical Transitions: Theoretical and Experimental Aspects

Impact of Lanthanide Nanomaterials on Photonic Devices and Smart Applications

Surface modification of Y2O3:Er,Yb upconversion nanoparticles prepared by laser ablation in water

Contact Info

Product

Resources

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Surface modification of Y₂O₃:Er,Yb upconversion nanoparticles prepared by laser ablation in water