Ultrafast Single‐Band Upconversion Luminescence in a Liquid‐Quenched Amorphous Matrix

Moon, Byeong‐Seok; Kim, Hyoun‐Ee; Kim, Dong Hwan

doi:10.1002/adma.201800008

Cited by 14 publications

(15 citation statements)

References 47 publications

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“…Monolithic lanthanide-doped microspheres, serving as microscale WGM resonators, were fabricated by liquid quenching of UCNPs as shown in Fig. 1a following the procedures described in our previous report 30 (see Supplementary Fig. 1 for details).…”

Section: Resultsmentioning

confidence: 99%

“…In this work, we describe the realization of a sub-10 W cm −2 threshold continuous-wave upconversion microlaser by rapid quenching of laser-molten UCNPs, which is called the liquid-quenching method 29 , 30 . Liquid quenching facilitates complete integration of UCNPs into a monolithic microsphere as small as 2.44 μm in diameter with a highly smooth surface texture, resulting in lower intracavity loss with high pump-to-gain interaction for efficient light coupling to whispering-gallery-mode (WGM) resonators, in contrast to previous upconversion microlasers 22 , 24 – 26 .…”

Section: Introductionmentioning

confidence: 99%

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Continuous-wave upconversion lasing with a sub-10 W cm−2 threshold enabled by atomic disorder in the host matrix

et al. 2021

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Microscale lasers efficiently deliver coherent photons into small volumes for intracellular biosensors and all-photonic microprocessors. Such technologies have given rise to a compelling pursuit of ever-smaller and ever-more-efficient microlasers. Upconversion microlasers have great potential owing to their large anti-Stokes shifts but have lagged behind other microlasers due to their high pump power requirement for population inversion of multiphoton-excited states. Here, we demonstrate continuous-wave upconversion lasing at an ultralow lasing threshold (4.7 W cm−2) by adopting monolithic whispering-gallery-mode microspheres synthesized by laser-induced liquefaction of upconversion nanoparticles and subsequent rapid quenching (“liquid-quenching”). Liquid-quenching completely integrates upconversion nanoparticles to provide high pump-to-gain interaction with low intracavity losses for efficient lasing. Atomic-scale disorder in the liquid-quenched host matrix suppresses phonon-assisted energy back transfer to achieve efficient population inversion. Narrow laser lines were spectrally tuned by up to 3.56 nm by injection pump power and operation temperature adjustments. Our low-threshold, wavelength-tunable, and continuous-wave upconversion microlaser with a narrow linewidth represents the anti-Stokes-shift microlaser that is competitive against state-of-the-art Stokes-shift microlasers, which paves the way for high-resolution atomic spectroscopy, biomedical quantitative phase imaging, and high-speed optical communication via wavelength-division-multiplexing.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous-wave upconversion lasing with a sub-10 W cm−2 threshold enabled by atomic disorder in the host matrix

et al. 2021

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“…More importantly, the emission intensity of Ln 3+ doped UCNPs depends on dopant–host combination, particle size, shape, and phase [32,33,34,35,36,37,38]. The emission intensity of NaYF 4 core was relatively weak due to the surface defects.…”

Section: Resultsmentioning

confidence: 99%

Rare Earth Hydroxide as a Precursor for Controlled Fabrication of Uniform β-NaYF4 Nanoparticles: A Novel, Low Cost, and Facile Method

Wang

Chen

et al. 2019

Molecules

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In recent years, rare earth doped upconversion nanocrystals have been widely used in different fields owing to their unique merits. Although rare earth chlorides and trifluoroacetates are commonly used precursors for the synthesis of nanocrystals, they have certain disadvantages. For example, rare earth chlorides are expensive and rare earth trifluoroacetates produce toxic gases during the reaction. To overcome these drawbacks, we use the less expensive rare earth hydroxide as a precursor to synthesize β-NaYF4 nanoparticles with multiform shapes and sizes. Small-sized nanocrystals (15 nm) can be obtained by precisely controlling the synthesis conditions. Compared with the previous methods, the current method is more facile and has lower cost. In addition, the defects of the nanocrystal surface are reduced through constructing core–shell structures, resulting in enhanced upconversion luminescence intensity.

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“…Upconversion luminescent materials using lanthanide ions as activators have unique optical properties, such as large anti‐stokes shift, long luminescent lifetime and without photobleaching . Y 2 O 3 is a luminescent matrix with high chemical and photochemical stability, high melting point and easy doping of rare earth ions.…”

Section: Introductionmentioning

confidence: 99%

“…[7] Upconversion luminescent materials using lanthanide ions as activators have unique optical properties, such as large antistokes shift, long luminescent lifetime and without photobleaching. [8][9][10] Y 2 O 3 is a luminescent matrix with high chemical and photochemical stability, high melting point and easy doping of rare earth ions. Therefore, Y 2 O 3 doped with Yb 3 + /Er 3 + ions UCLNPs are widely applied in light sources, [11] biological images, [12] biodetections [13] and other fields.…”

Section: Introductionmentioning

confidence: 99%

Neoteric Conjugative Electrospinning towards Alloplastic Nanofiber Yarns Affording Enhanced Upconversion Luminescence and Tailored Magnetism

et al. 2020

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Upconversion luminescent-magnetic [Y 2 O 3 :Yb 3 + , Er 3 + /polyacrylonitrile (PAN)]//[CoFe 2 O 4 /PAN] alloplastic nanofiber yarns (ANYs) are successfully prepared by a novel conjugative electrospinning. The ANYs consist of two different kinds of nanofibers, respectively called as [CoFe 2 O 4 /PAN] magnetic nanofibers and [Y 2 O 3 :Yb 3 + , Er 3 + /PAN] upconversion luminescent nanofibers, and the two kinds of nanofibers are combined together and twisted to form ANYs. Pumped by 980-nm laser, the ANYs exhibit excellent upconversion luminescence (UCL) and orange-red fluorescence. ANYs demonstrate tailored saturation magnetization by modulating CoFe 2 O 4 nanoparticles (NPs) content. The influence mechanism of magnetic CoFe 2 O 4 NPs on the UCL of ANYs is detailedly explored. The relationship between mechanicalproperties and twist for ANYs is explored through the tensile test. Compared with the counterpart coessential nanofiber yarns (CNYs), ANYs exhibit about 10 times stronger UCL intensity owing to the complete separation of the upconversion luminescent substance from the magnetic substance and thereby great reduction of impact of the magnetic substance on the upconversion luminescent substance. Thus, concurrent enhancive upconversion luminescence (UCL) and tunable magnetism of the ANYs are successfully achieved. The detailed formation mechanism of ANYs is advanced and a novel fabrication technique of yarns is established and can be popularized to prepare other bi-and multi-functional nanofibrous yarns.

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Ultrafast Single‐Band Upconversion Luminescence in a Liquid‐Quenched Amorphous Matrix

Cited by 14 publications

References 47 publications

Continuous-wave upconversion lasing with a sub-10 W cm−2 threshold enabled by atomic disorder in the host matrix

Continuous-wave upconversion lasing with a sub-10 W cm−2 threshold enabled by atomic disorder in the host matrix

Rare Earth Hydroxide as a Precursor for Controlled Fabrication of Uniform β-NaYF4 Nanoparticles: A Novel, Low Cost, and Facile Method

Neoteric Conjugative Electrospinning towards Alloplastic Nanofiber Yarns Affording Enhanced Upconversion Luminescence and Tailored Magnetism

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