Magnetic Tuning of Upconversion Luminescence in Lanthanide‐Doped Bifunctional Nanocrystals

Liu, Yunxin; Wang, Dingsheng; Shi, Jing; Peng, Qing; Li, Yadong

doi:10.1002/ange.201209884

Cited by 35 publications

(22 citation statements)

References 22 publications

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“…With rapid advances in chemical science, there are many nanomaterials available with well-defined sizes, shapes, crystal facets, structures and compositions. [7][8][9][10][11][12][13][14] There have been increasing efforts to design and control the interface chemistry between different types of components. This is because two-phase interfaces could render hybrid junctions with rich redox reactions, which are beneficial for enhancing the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Clean synthesis of Cu2O@CeO2 core@shell nanocubes with highly active interface

Wang

Liu

et al. 2015

NPG Asia Mater

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The fabrication of multi-component hybrid nanostructures is of vital importance because their two-phase interface could provide a rich environment for redox reactions, which are beneficial for enhancing catalytic performance. Inspired by the above consideration, strongly coupled Cu 2 O@CeO 2 core@shell nanostructures have been successfully prepared via a non-organic and clean aqueous route without using any organic additive. In this process, an auto-catalytic redox reaction occurred on the two-phase interface, followed by a triggered self-assembly process. Additionally, the size, morphology and composition of the as-obtained nanostructures can be tuned well by varying the reaction temperature, as well as the species and the amount of Cu precursors. The catalytic tests for peroxidase-like activity and CO oxidation have been conducted in detail, and the results confirm a strong synergistic effect at the interface sites between the CeO 2 and Cu 2 O components.

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Section: Introductionmentioning

confidence: 99%

Clean synthesis of Cu2O@CeO2 core@shell nanocubes with highly active interface

Wang

Liu

et al. 2015

NPG Asia Mater

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“…Moreover, it is almost impossible to isolate the pure crystal field effect from the other extrinsic effects present in different samples, such as chemical inhomogeneities and defects. Therefore, it is interesting to investigate whether the tuning of luminescence can be achieved by various external stimuli, such as magnetic-field 6 , electric-field 7 , and strain 8 . Particularly, large misfit strain can exist in thin films when one material is deposited on another, resulting from differences in crystal lattice parameters and thermal expansion coefficients between the grown film and underlying substrate or arising from defects formed during film deposition 9 10 .…”

mentioning

confidence: 99%

Tuning of near-infrared luminescence of SrTiO3:Ni2+ thin films grown on piezoelectric PMN-PT via strain engineering

Bai

Zhang

Hao

2014

Sci Rep

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We report the tunable near-infrared luminescence of Ni2+ doped SrTiO3 (STO:Ni) thin film grown on piezoelectric Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (PMN-PT) substrate via strain engineering differing from conventional chemical approach. Through controlling the thickness of STO:Ni film, the luminescent properties of the films including emission wavelength and bandwidth, as well as lifetime can be effectively tuned. The observed phenomena can be explained by the variation in the crystal field around Ni2+ ions caused by strain due to the lattice mismatch. Moreover, the modulation of strain can be controlled under an external electric field via converse piezoelectric effect of PMN-PT used in this work. Consequently, controllable emission of the STO:Ni thin film is demonstrated in a reversible and real-time way, arising from the biaxial strain produced by piezoelectric PMN-PT. Physical mechanism behind the observation is discussed. This work will open a door for not only investigating the luminescent properties of the phosphors via piezoelectric platform, but also potentially developing novel planar light sources.

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“…To obtain PABA‐supported core/inert–shell UCNPs, NaGdF 4 :Yb 3+ ,Er 3+ core and NaYF 4 @NaGdF 4 :Yb 3+ ,Er 3+ core/shell (CS) UCNPs with uniform particle size were first synthesized by the method in our previous works, with average diameter of 28 and 34 nm, and shown in Figure a,b, respectively. A uniform shell thickness of 3 nm was clearly observed.…”

Section: Structurementioning

confidence: 99%

Steady State Luminescence Enhancement in Plasmon Coupled Core/Shell Upconversion Nanoparticles

Zhan

Xiong

Nie

et al. 2019

Adv Materials Inter

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Plasmon enhanced upconversion luminescence has been deeply investigated and finds extensive applications from fluorescent sensors to cancer therapy. Here, the steady state luminescence enhancement is shown in plasmonic substrate coupled upconversion nanoparticles (UCNPs). The plasmonic Au‐nanohole‐nanoplate bilayer arrays (PABAs) are designed for generating full‐covered local field which couple both the excitation and the emission field of core/shell UCNPs. By tuning the coupling distance through a 3 nm thick inert shielding shell on upconversion nanoparticles, the plasmon enhanced upconversion luminescence enhancement is found independent on excitation power. This effect will greatly facilitate the applications of plasmon enhanced upconversion nanoparticles as biosensors even under extremely weak excitation. E.g., PABA‐supported core/inert–shell UCNPs are employed as a fluorescent sensor for detecting acetic acid gas, and a linear relationship between upconversion luminescent intensity and acetic acid concentration can be obtained as expected, accompanied by a detection limit of 81 nmol mL−1, which is one order of magnitude lower than the best level ever reported.

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Magnetic Tuning of Upconversion Luminescence in Lanthanide‐Doped Bifunctional Nanocrystals

Cited by 35 publications

References 22 publications

Clean synthesis of Cu2O@CeO2 core@shell nanocubes with highly active interface

Clean synthesis of Cu2O@CeO2 core@shell nanocubes with highly active interface

Tuning of near-infrared luminescence of SrTiO3:Ni2+ thin films grown on piezoelectric PMN-PT via strain engineering

Steady State Luminescence Enhancement in Plasmon Coupled Core/Shell Upconversion Nanoparticles

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