Multicolor upconversion emission of lanthanide-doped single LiYF4 and LiLuF4 microcrystal

Gao, Wei; Dong, Jun; Wang, Zhaojin; Zhang, Zhenglong; Zheng, H.

doi:10.1016/j.materresbull.2017.03.043

Cited by 23 publications

(11 citation statements)

References 46 publications

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“…Unlike traditionally implemented high-pressure, autoclave-based solvothermal methods that are time-consuming (≥12 h) and rely on convectional heating, − this microwave-assisted method yields high-quality products in 10 min. Conveniently, the developed synthesis method also grants access to other state of the art RE 3+ -doped M(RE)F 4 host materials: namely, LiYbF 4 microparticles as well as β-NaGdF 4 and α-NaYF 4 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF₄ Microparticles

2018

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Growing attention toward optically active materials has prompted the development of novel synthesis methods for a more reliable and efficient access to these systems. In this regard, microwave-assisted approaches provide unique advantages over traditional solvothermal methods reliant on convectional heating: namely, significantly shorter reaction durations, more rigid reaction conditions, and thus a higher degree of reproducibility. Reported herein for the first time is a rapid synthesis of rare-earth (RE3+)-doped LiYF4 upconverting and downshifting microparticles with well-defined bipyramidal morphology and good size dispersion via a microwave-assisted solvothermal process. The suggested material growth mechanism identifies a suitable Li+ to RE3+ ion ratio, an abundance of pH-sensitive acetate surface-capping ligands, and an appropriate reaction temperature/time profile as crucial for enabling a phase transformation of an intermediary yttrium ammonium fluoride phase into LiYF4 and subsequent particle ripening. The versatility of the reported method is highlighted by its extension toward the synthesis of other state of the art M(RE)F4 (M = alkali metal) optical materials: RE3+-doped LiYbF4 microparticles and β-NaGdF4 and α-NaYF4 nanoparticles. All of the obtained Yb3+/Er3+- and Yb3+/Tm3+-codoped M(RE)F4 materials exhibited characteristic upconversion emission, while downshifting capabilities were induced through Ce3+/Tb3+ codoping of LiYF4. Further attention was devoted to single-particle optical characterization via hyperspectral imaging of Yb3+/Er3+- and Yb3+/Tm3+-codoped LiYF4 microparticles to explore the spatial variability of upconversion emission within individual particles.

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Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF₄ Microparticles

2018

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“…While previous work attributes the observed emission intensity anisotropy to plausible factors such as: inhomogeneous RE 3+ dopant distribution, a difference in the crystal‐field strength experienced by dopant ions occupying crystallographic sites that are located in the interior of the LiYF 4 particle versus its apex or face, as well as uneven surface‐ligand coverage, we herein demonstrate that the uniaxially birefringent crystalline nature of Li(RE)F 4 and the consequent polarized emission cannot be overlooked. [ 27,28 ] As evidenced by this work, taking into consideration the fact that emission stemming from Li(RE)F 4 particles is polarized is especially important when conducting single‐particle studies and drawing conclusions from possible interparticle fluctuations in emission intensity.…”

Section: Resultsmentioning

confidence: 99%

“…[ 19 ] Heterogeneous RE 3+ dopant distribution, a difference in the crystal field strength experienced by dopant ions occupying different crystallographic sites within the lattice of the microparticle, and uneven surface‐ligand coverage have been all suggested as tentative explanations for the observed intensity variation exhibited by the erbium and ytterbium co‐doped LiYF 4 (LiYF 4 :Yb 3+ /Er 3+ ) microparticles during hyperspectral imaging. [ 19,27,28 ] For instance, RE 3+ dopant concentration greatly influences the upconversion process. Dopant concentrations that are too high foster cross‐relaxation processes, which can potentially result in weaker emission.…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral Imaging and Optical Trapping: Complementary Tools for Assessing Direction‐Dependent Polarized Emission from Single Upconverting LiYF₄:Yb³⁺/Er³⁺ Microparticles

Panov

Ortiz‐Rivero

et al. 2021

Advanced Optical Materials

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Single‐particle fluorescent probes with the capacity to infer specific intracellular conditions, for instance, have great application potential in the realm of biomedicine. Imaging techniques that improve our understanding of the fluorescence processes at a single‐particle level are thus instrumental in actualizing this potential. This study demonstrates the importance of implementing synergistic single‐particle spectroscopic techniques to gain a more comprehensive understanding of the optical anisotropy exhibited by upconverting erbium and ytterbium co‐doped lithium yttrium tetrafluoride (LiYF4:Yb3+/Er3+) microparticles. More specifically, optical trapping and single‐particle polarized emission spectroscopy is herein leveraged to provide a plausible explanation for the spatial emission intensity distribution variation exhibited by LiYF4:Yb3+/Er3+ microparticles during hyperspectral imaging. By probing the polarized emission stemming from a single, optically trapped LiYF4:Yb3+/Er3+ microparticle, it is possible to find evidence that the emission intensity anisotropy exhibited by the respective microparticles during hyperspectral imaging arises as a consequence of the selection rules governing the emission probability in rare‐earth (RE3+) ions doped into a uniaxially birefringent host matrix such as LiYF4.

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“…Yb 3+ -doped LiYF 4 crystals were synthesized by a previously reported hydrothermal method ( 41 ). In this work, 10% Yb 3+ :LiYF 4 was used.…”

Section: Methodsmentioning

confidence: 99%

Opto-refrigerative tweezers

Chen

Liu

et al. 2021

Sci. Adv.

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Optical tweezers offer revolutionary opportunities for both fundamental and applied research in materials science, biology, and medical engineering. However, the requirement of a strongly focused and high-intensity laser beam results in potential photon-induced and thermal damages to target objects, including nanoparticles, cells, and biomolecules. Here, we report a new type of light-based tweezers, termed opto-refrigerative tweezers, which exploit solid-state optical refrigeration and thermophoresis to trap particles and molecules at the laser-generated cold region. While laser refrigeration can avoid photothermal heating, the use of a weakly focused laser beam can further reduce the photodamages to the target object. This novel and noninvasive optical tweezing technique will bring new possibilities in the optical control of nanomaterials and biomolecules for essential applications in nanotechnology, photonics, and life science.

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Multicolor upconversion emission of lanthanide-doped single LiYF4 and LiLuF4 microcrystal

Cited by 23 publications

References 46 publications

Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF₄ Microparticles

Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF₄ Microparticles

Hyperspectral Imaging and Optical Trapping: Complementary Tools for Assessing Direction‐Dependent Polarized Emission from Single Upconverting LiYF₄:Yb³⁺/Er³⁺ Microparticles

Opto-refrigerative tweezers

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Multicolor upconversion emission of lanthanide-doped single LiYF4 and LiLuF4 microcrystal

Cited by 23 publications

References 46 publications

Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF4 Microparticles

Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF4 Microparticles

Hyperspectral Imaging and Optical Trapping: Complementary Tools for Assessing Direction‐Dependent Polarized Emission from Single Upconverting LiYF4:Yb3+/Er3+ Microparticles

Opto-refrigerative tweezers

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Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF₄ Microparticles

Microwave-Assisted Solvothermal Synthesis of Upconverting and Downshifting Rare-Earth-Doped LiYF₄ Microparticles

Hyperspectral Imaging and Optical Trapping: Complementary Tools for Assessing Direction‐Dependent Polarized Emission from Single Upconverting LiYF₄:Yb³⁺/Er³⁺ Microparticles