Morphology-controllable synthesis and enhanced luminescence properties of β-NaLuF4:Ln (Ln = Eu, Tb and Ce/Tb) microcrystals by solvothermal process

He, Fei; Niu, Na; Zhang, Zhenguo; Zhang, Xiao; Wang, Dong; Bai, Ling; Gai, Shili; Li, Xingbo; Yang, Piaoping

doi:10.1039/c2ra20675g

Cited by 25 publications

(11 citation statements)

References 68 publications

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“…The inset is a high-resolution transmission electron microscopy (HRTEM) image, and the lattice fringes in the HRTEM image confirm the crystallinity. The distance of 0.29 nm between the adjacent lattice fringes corresponds to the d 110 spacing of the hexagonal NaLuF 4 phase17. To investigate the crystal structure and phase purity, the UCNCs were characterized by XRD.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with traditional organic fluorophores or semi-conductor quantum dots (QDs), UCNCs show superior features, such as high photochemical stability, non-blinking, resistance to photobleaching, absence of autofluorescence, and tissue-penetrable near-infrared light excitation111213. At present, most studies have focused on the synthesized Ln 3+ doped host materials, including nanorods14, spherical nanoparticles15, tetragonal and hexagonal nanoparticles1617. Take the optical thermometry experiment for example; the UCNCs powder is easy oxidized at a high temperature which may limit the application of the UCNCs.…”

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confidence: 99%

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Dispersing upconversion nanocrystals in a single silicon microtube

Wang

et al. 2016

Sci Rep

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Nanocrystals of Ln3+ (Ln = Yb, Tm and Ho) doped β-NaLuF4 with average diameter about 200 nm are dispersed in silica-based microtube (MT) by a simple flame heating method. The fabricated microtube has a diameter range from 2 μm to 30 μm and lengths up to hundreds microns. The fluorescence of upconversion nanocrystals (UCNCs) can propagate along a single MT and couple into another MT through evanescent field. The guiding performance of the single UCNCs doped MT is measured to prove that it can be used as an active waveguide. Moreover, optical temperature sensing based on the single UCNCs-MT is also demonstrated, and the sensitivity of UCNCs-MT is significantly enough for thermometry applications in the range of 298–383 K.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Dispersing upconversion nanocrystals in a single silicon microtube

Wang

et al. 2016

Sci Rep

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“…To date, synthesis conditions play a significant and sensitive impact on the sizes and surface properties of the NPs nanomaterials, because the growth of the nanocrystals is often limited by the difficulty in material preparation. The majority of researches in literature are focused on controlled morphology, experimental processes, and other phenomena [44][45][46]. However, a perfect luminescent probe should have powerful emission, small crystalline sizes, good colloidal stability, excellent biocompatibility, and less toxicity.…”

Section: Introductionmentioning

confidence: 99%

Physiochemical characterization of highly biocompatible, and colloidal LaF3:Yb/Er upconversion nanoparticles

Ansari

Parchur

Labis

et al. 2021

Photochem Photobiol Sci

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Highly colloidal upconversion nanoparticles (UCNPs) were synthesized at low temperatures by the thermal decomposition process. The structure, morphology, crystallinity, surface chemistry, and optical properties were systematically optimized and studied through various spectroscopic techniques. X-ray diffraction (XRD) patterns have shown the formation of singlephase, highly purified, well-crystalline, hexagonal LaF 3 NPs, while the TEM micrographs show small, irregular sizes, spherically shaped, and aggregated polycrystalline UCNPs with an average crystalline size of about 8-15 nm. The Negative Zeta Potential value exhibits good biocompatibility of the UCNPs, which supports the idea that surface-anchored hydroxyl groups facilitate the stabilization of the NPs in aqueous media, as well as enhance biomolecules' tagging efficiency. The absorption spectrum, Zeta Potential, and hydrodynamic size that were measured in aqueous media illustrate excellent dispersibility, colloidal stability, biocompatibility, and cytotoxicity character of the UCNPs. Zeta potential and MTT assay studies illustrated high biocompatibility, it could be due to the surface-anchored hydroxyl groups. The nanoproduct demonstrates an excellent UC luminescence spectrum (i.e., prominent green emission 4 S 3/2 → 4 I/ 15/2 ) upon irradiation by the 980-nm laser diode. TEM micrographs, further, revealed that this optically active material with aqueous sensitivities, porous crystal structure, and excellent UCNPs, could be a favorable candidate for potential photonics-based bio-related applications.Pushing the limits of flash photolysis to unravel the secrets ofbiological electron and proton transfer -a topical issue in honour ofKlaus Brettel.

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“…Thus, rare earth fluorides have attracted much attention of scientific community due to their potential applications in the fields of solid-state lasers, multicolor three dimensional displays, optical storage, and biological fields including fluorescent labels, therapy, and drug delivery [7][8][9][10]. One example for this class of fluoride compounds is NaLuF 4 , which is an ideal UC host material [11][12][13][14][15][16]. Shi et al [11] synthesized hexagonal nanoplates -NaLuF 4 :Yb 3+ /Tm 3+ crystals by hydrothermal method using oleic acid as the surfactant and demonstrated that -NaLuF 4 nanocrystals might be a better kind of upconversion material than their -NaYF 4 counterpart.…”

Section: Introductionmentioning

confidence: 99%

Upconversion luminescence and Visible‐Infrared Properties of β‐NaLuF₄:Er³⁺ Microcrystals Synthesized by the Surfactant‐Assisted Hydrothermal Method

Han

Yan

Zheng

et al. 2014

Journal of Nanomaterials

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We report the obtention of -NaLuF 4 microcrystals doped with Er 3+ ions by the surfactant-assisted hydrothermal method. It was found that shape modulation could be realized by changing the surfactants (ethylenediaminetetraacetic acid, polyvinylpyrrolidone, and trisodium citrate) introduced into the reaction system. The surfactants can strongly control the size and shape of as-prepared samples through absorbing on the surface of primary particles and/or coordinating with rare earth ions. Hexagonal prism-like -NaLuF 4 :Er 3+ microcrystals demonstrate intense upconverted luminescence (UCL) pumped by 1.54 m infrared laser in comparison with hexagonal tube-like, disk-like, and sphere-like microcrystals, which exhibit great distinction. More interestingly, a synergistic effect combined dual mode (i.e., downconversion and upconversion) with 8% absolute enhancement rate of the red emission centered at 659 nm ( 4 F 9/2 → 4 I 15/2 ) is witnessed in hexagonal prisms -NaLuF 4 :Er 3+ phosphors by employing the dual wavelength 416 nm and 1.54 m excitation source for the first time.

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Morphology-controllable synthesis and enhanced luminescence properties of β-NaLuF4:Ln (Ln = Eu, Tb and Ce/Tb) microcrystals by solvothermal process

Cited by 25 publications

References 68 publications

Dispersing upconversion nanocrystals in a single silicon microtube

Dispersing upconversion nanocrystals in a single silicon microtube

Physiochemical characterization of highly biocompatible, and colloidal LaF3:Yb/Er upconversion nanoparticles

Upconversion luminescence and Visible‐Infrared Properties of β‐NaLuF₄:Er³⁺ Microcrystals Synthesized by the Surfactant‐Assisted Hydrothermal Method

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Morphology-controllable synthesis and enhanced luminescence properties of β-NaLuF4:Ln (Ln = Eu, Tb and Ce/Tb) microcrystals by solvothermal process

Cited by 25 publications

References 68 publications

Dispersing upconversion nanocrystals in a single silicon microtube

Dispersing upconversion nanocrystals in a single silicon microtube

Physiochemical characterization of highly biocompatible, and colloidal LaF3:Yb/Er upconversion nanoparticles

Upconversion luminescence and Visible‐Infrared Properties of β‐NaLuF4:Er3+ Microcrystals Synthesized by the Surfactant‐Assisted Hydrothermal Method

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Upconversion luminescence and Visible‐Infrared Properties of β‐NaLuF₄:Er³⁺ Microcrystals Synthesized by the Surfactant‐Assisted Hydrothermal Method