Intense multiphoton upconversion of Yb3+–Tm3+ doped β-NaYF4 individual nanocrystals by saturation excitation

Zhou, Jiajia; Chen, Gengxu; Zhu, Ying; Huo, Lili; Mao, Wei; Zou, Danna; Sun, Xinwen; Wu, E; Zeng, Heping; Zhang, Junjie; Zhang, Long; Qiu, Jianrong; Xu, Shiqing

doi:10.1039/c4tc02363c

Cited by 59 publications

(35 citation statements)

References 41 publications

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“…Because of the unique features of Pr 3+ ions, there are several different broad UCPL bands corresponding to Pr 3+ ions transitions . Especially, the UCPL peaks in blue (475 nm), green (523, 540, and 552 nm), and red (654 nm) are trichromatic elements of white light, due to 3 P 0 → 3 H 4 , 1 I 6 → 3 H 5 , 3 P 1 → 3 H 5 , 3 P 0 → 3 H 5 , 3 P 1 → 3 F 3 transitions of Pr 3+ ions (Figure ). Optimization of the sintering condition by monitoring the UCPL spectrum intensity was necessary as we control the sintering time (Figure A) and laser power density.…”

Section: Resultsmentioning

confidence: 99%

Laser excitation‐activated self‐propagating sintering of NaYbF₄:Pr³⁺/Gd³⁺ white light microcrystal phosphors

Jiang

Shen

et al. 2018

J Am Ceram Soc

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We demonstrate that self‐propagating sintering reaction could be activated and dramatically enhanced by laser excitation of ion dopants in the solid‐state reactants. Near‐resonant laser absorption and subsequent nonradiative decays make the solid‐state reactants be sintered efficiently while ionic excitations catalyze self‐propagating solid‐state reactions. As a prototype demo, we synthesized white light upconversion phosphors NaYbF4:Pr3+/Gd3+. A continuous‐wave laser at 980 nm was used to populate Yb3+ ions in YbF3 to excited level, which react with NaF to preform NaYbF4 nuclei. The preformed nuclei enhanced laser excitation and energy transfer to those ions that could not be directly excited by the pump laser and thus enabled self‐propagating solid‐state sintering synthesis of NaYbF4 microcrystals at quite low laser powers. Laser excitation of Yb3+ ions could also benefit facile rare‐earth ion doping through activated self‐propagating reactions. Gd3+ and Pr3+ ions were doped in NaYbF4 by simply adding Gd3+ and Pr3+ ionic oxides or fluorides in the raw materials. In addition, Gd3+ ions doping in F− anions ambient could transform the NaYbF4 microcrystal phase from cubic to hexagonal and tune upconversion photoluminescence. This synthetic method can be widely applied to synthesize many other solid‐state compounds, perovskite solar cells, photocatalysts, solid oxide fuel cells, and so forth.

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Section: Resultsmentioning

confidence: 99%

Laser excitation‐activated self‐propagating sintering of NaYbF₄:Pr³⁺/Gd³⁺ white light microcrystal phosphors

Jiang

Shen

et al. 2018

J Am Ceram Soc

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“…So far, most previous works in this field focus mainly on the cooperative multiphoton luminescence in which two or more rare-earth ions are generally involved. In this case, the laser excitation is initially absorbed by a sensitizer ion and subsequently transferred to an acceptor ion that is responsible for the upconversion luminescence [29][30][31][32]34]. In addition, the longest excitation wavelength used for generating the upconversion luminescence is about 1.5 μm.…”

Section: Upconversion Luminescence Under Multiphoton Excitation In Thmentioning

confidence: 98%

“…At high excitation intensities, these intermediate states are effectively populated, leading to the phenomenon of super saturation [27,28]. As a result, the number of simultaneously absorbed photons necessary for the upconversion is reduced and so is the excitation intensity required for upconversion [29][30][31][32][33][34]. In addition, these glasses are easy to be shaped and possess high transparency, low production cost, and good thermal stability.…”

Section: Introductionmentioning

confidence: 96%

Upconversion luminescence from aluminoborate glasses doped with Tb^3+, Eu^3+ and Dy^3+ under the excitation of 26-μm femtosecond laser pulses

et al. 2015

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We investigated the upconversion luminescence of three aluminoborate glasses doped with Tb(3+), Eu(3+), and Dy(3+) under the excitation of 2.6-μm femtosecond (fs) laser pulses. Efficient upconversion luminescence appearing in the visible light spectral region was observed in all three glasses and the emission spectra are quite similar to those obtained under single photon excitation. From the dependence of the luminescence intensity on the excitation intensity in the low excitation intensity regime, it was revealed that a four-photon process is involved in the generation of the upconversion luminescence in the Tb(3+)- and Eu(3+)-doped glasses while a mixed two- and three-photon process is involved in the Dy(3+)-doped glass. In the high excitation intensity regime, a reduction of the slope to about 1.0 was observed for all glasses. A physical mechanism based on the super saturation of the intermediate states of the rare-earth ions was employed to interpret the upconversion luminescence under the excitation of long-wavelength fs laser pulses. Significantly broadened luminescence spectra were observed in thick glasses under high excitation intensities and it can be attributed to the self-focusing of the laser beam in the thick glasses.

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“…Due to the saturation effect, the quantum yield would eventually approach a plateau at very high excitation intensities . In any conditions, upconversion luminescence, especially that promoted by a multi‐photon process, prefers high excitation intensity, analogous to the case of coherent nonlinear optical processes that necessitate high laser intensity. In other words, the upconversion system generate upconversion luminescence in a more efficient way at higher excitation intensities.…”

Section: Optical Responses Of Upconversion Systems To External Stimulimentioning

confidence: 99%

Photon Upconversion Kinetic Nanosystems and Their Optical Response

Liu

Huang

Valiev

et al. 2017

Laser & Photonics Reviews

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Lanthanide-doped photon upconversion nanoparticles (UCNPs) are capable of converting low-intensity near-infrared light to UV and visible emission through the synergistic effects of light excitation and mutual interactions between doped ions. UCNPs have attracted strong interest as unique spectrum converters and found a multitude of applications in areas like biomedical imaging, energy harvesting and information technology. UCNPs are distinct from many other types of luminescent materials in terms of the involvement of a host lattice and multiple optical centers, i.e., trivalent lanthanide ions with manyfolds of accessible long-lived energy states, in individual nanoparticles. The mutual interactions between these optical centers, i.e., sequential energy transfers, make them operate as an integrated unit and co-determine the luminescence kinetics and other optical properties of the individual nanoparticle. Thus, each nanoparticle consititutes a kinetic optical system. In this work, we explore UCNPs from the outset of being such kinetic optical systems and review their physical formation, the underlying photophysics, macroscopic statistical description, and their response to various optical stimuli in the spectral, polarization, intensity, temporal and frequency domains, and demonstrate ways that their optical output can be optimized by manipulating the excitation schemes. Our review highlights upconversion nanotechnology as an interdisciplinary field across chemistry, physics and biomedical engineering, with great future possibilities, flexibility and ramifications. We outline some of the potential directions of upconversion nanoparticle research.

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Intense multiphoton upconversion of Yb³⁺–Tm³⁺ doped β-NaYF₄ individual nanocrystals by saturation excitation

Abstract: We report the intense multiphoton upconversion of β-NaYF4: Yb3+–Tm3+ individual nanocrystals benefiting from the perfect ladder-type electron configuration under saturation excitation.

Cited by 59 publications

References 41 publications

Laser excitation‐activated self‐propagating sintering of NaYbF₄:Pr³⁺/Gd³⁺ white light microcrystal phosphors

Laser excitation‐activated self‐propagating sintering of NaYbF₄:Pr³⁺/Gd³⁺ white light microcrystal phosphors

Upconversion luminescence from aluminoborate glasses doped with Tb^3+, Eu^3+ and Dy^3+ under the excitation of 26-μm femtosecond laser pulses

Photon Upconversion Kinetic Nanosystems and Their Optical Response

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Intense multiphoton upconversion of Yb3+–Tm3+ doped β-NaYF4 individual nanocrystals by saturation excitation

Abstract: We report the intense multiphoton upconversion of β-NaYF4: Yb3+–Tm3+ individual nanocrystals benefiting from the perfect ladder-type electron configuration under saturation excitation.

Cited by 59 publications

References 41 publications

Laser excitation‐activated self‐propagating sintering of NaYbF4:Pr3+/Gd3+ white light microcrystal phosphors

Laser excitation‐activated self‐propagating sintering of NaYbF4:Pr3+/Gd3+ white light microcrystal phosphors

Upconversion luminescence from aluminoborate glasses doped with Tb^3+, Eu^3+ and Dy^3+ under the excitation of 26-μm femtosecond laser pulses

Photon Upconversion Kinetic Nanosystems and Their Optical Response

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Resources

About

Intense multiphoton upconversion of Yb³⁺–Tm³⁺ doped β-NaYF₄ individual nanocrystals by saturation excitation

Laser excitation‐activated self‐propagating sintering of NaYbF₄:Pr³⁺/Gd³⁺ white light microcrystal phosphors

Laser excitation‐activated self‐propagating sintering of NaYbF₄:Pr³⁺/Gd³⁺ white light microcrystal phosphors