Enhancement on concentration quenching threshold and upconversion luminescence of β-NaYF4:Er3+/Yb3+ codoping with Li+ ions

Ding, Yanli; Zhang, Xiaodan; Gao, Han; Xu, Shengzhi; Wei, Changchun; Zhao, Ying

doi:10.1016/j.jallcom.2014.02.050

Cited by 54 publications

(19 citation statements)

References 21 publications

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“…16. The luminescence lifetime changes from several hundred microseconds to submillisecond depending on Er 3þ concentration, 18 and similar saturation effects have been reported elsewhere. 19,20 Although it was expected that high-order nonlinear responses would clearly appear if we observe UCNPs with much lower excitation intensities, a sufficiently high SNR was not achieved.…”

Section: Upconversion Emission Spectrum and Luminescence Responsessupporting

confidence: 82%

Excitation of erbium-doped nanoparticles in 1550-nm wavelength region for deep tissue imaging with reduced degradation of spatial resolution

et al. 2019

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Rare-earth-doped nanoparticles are one of the emerging probes for bioimaging due to their visibleto-near-infrared (NIR) upconversion emission via sequential single-photon absorption at NIR wavelengths. The NIR-excited upconversion property and high photostability make this probe appealing for deep tissue imaging. So far, upconversion nanoparticles include ytterbium ions (Yb 3þ) codoped with other rare earth ions, such as erbium (Er 3þ) and thulium (Tm 3þ). In these types of upconversion nanoparticles, through energy transfer from Yb 3þ excited with continuous wave light at a wavelength of 980 nm, upconversion emission of the other rare earth dopants is induced. We have found that the use of the excitation of Er 3þ in the 1550-nm wavelength region allows us to perform deep tissue imaging with reduced degradation of spatial resolution. In this excitation-emission process, three and four photons of 1550-nm light are sequentially absorbed, and Er 3þ emits photons in the 550-and 660nm wavelength regions. We demonstrate that, compared with the case using 980-nm wavelength excitation, the use of 1550-nm light enables us to moderate degradation of spatial resolution in deep tissue imaging due to the lower light scattering coefficient compared with 980-nm light. We also demonstrate that live cell imaging is feasible with this 1550 nm excitation. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Upconversion Emission Spectrum and Luminescence Responsessupporting

confidence: 82%

Excitation of erbium-doped nanoparticles in 1550-nm wavelength region for deep tissue imaging with reduced degradation of spatial resolution

et al. 2019

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“…Such shrinking and expanding effects on the unit-cell volume caused by introduced dopants into host lattice occupying substitutional and interstitial sites correspondingly are also reported in the case of Li + doped NaGdF 4 and NaYF 4 nanocrystals. 29 It is worth noting that both these two occupancies of Fe 3+ ions located in the host matrix can tailor the local crystal field around Er 3+ which gives rise to the breaking of the forbidden transition in favour of the irradiative f-f intra-configuration transitions of the rare earth ions. Transmission electron microscopy (TEM), SAED and size distribution analysis are performed as shown in Figure 2 to further clarify the size/phase evolution of the NaYF 4 :Yb,Er nanocrystals co-doped with various Fe 3+ contents.…”

Section: Characterizationmentioning

confidence: 99%

Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe³⁺ doping in NaYF₄:Yb,Er nanocrystals

et al. 2015

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Red upconversion luminescence (UCL) is selectively enhanced by about 7 times via Fe(3+) codoping into a NaYF4:Yb,Er nanocrystalline lattice. The maximum red-to-green ratio (R/G) as well as the overall integrated UCL intensity features at an Fe(3+) content of 20 mol%. The size and phase of nanocrystals are simultaneously manipulated via Fe(3+) doping with various concentrations by a facile hydrothermal method. Contrary to the literature, the pure hexagonal phase appears when Fe(3+) concentrations are from 5 to 20 mol%, meanwhile, the size of NaYF4:Yb,Er nanocrystals reaches its maximum at 10 mol%. The intensified visible UCL especially the dominant red emission is mainly ascribed to the energy transfer (ET) from |(2)F7/2, (4)T1g > (Yb(3+)-Fe(3+) dimer) to (4)F9/2 (Er(3+)) states as well as the distortion of the crystalline field symmetry upon Fe(3+) codoping. Dynamic investigation of (4)S3/2 and (4)F9/2 states under the pulsed laser excitation of 980 nm along with the diffuse reflectance data further supports the proposed mechanism of UC processes. The results show the remarkable promise of Fe(3+)-codoped NaYF4:Yb,Er nanocrystals as upconverting nanoprobes with high sensitivity and penetrability in deeper tissue for multimodal biomedical imaging.

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“…For instance, Rai's group reported 24 times enhancement of the green UC emission in Y 2 O 3 :Yb 3+ /Er 3+ nanocrystals by doping with Li + [14]. Zhang et al exhibited 2 and 3.3 times improvement of the green and red emissions in b-NaYF 4 :Yb 3+ , Er 3+ microcrystals (MCs) [15]. Zhao's group achieved high-intensity red emission via doping Li + into GdF 3 :Yb/ Er UC nanoparticles [16].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous size and luminescence control of NaYF4:Yb3+/RE3+ (RE=Tm, Ho) microcrystals via Li+ doping

Lin

Teng

et al. 2015

Optical Materials

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Enhancement on concentration quenching threshold and upconversion luminescence of β-NaYF4:Er3+/Yb3+ codoping with Li+ ions

Cited by 54 publications

References 21 publications

Excitation of erbium-doped nanoparticles in 1550-nm wavelength region for deep tissue imaging with reduced degradation of spatial resolution

Excitation of erbium-doped nanoparticles in 1550-nm wavelength region for deep tissue imaging with reduced degradation of spatial resolution

Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe³⁺ doping in NaYF₄:Yb,Er nanocrystals

Simultaneous size and luminescence control of NaYF4:Yb3+/RE3+ (RE=Tm, Ho) microcrystals via Li+ doping

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Enhancement on concentration quenching threshold and upconversion luminescence of β-NaYF4:Er3+/Yb3+ codoping with Li+ ions

Cited by 54 publications

References 21 publications

Excitation of erbium-doped nanoparticles in 1550-nm wavelength region for deep tissue imaging with reduced degradation of spatial resolution

Excitation of erbium-doped nanoparticles in 1550-nm wavelength region for deep tissue imaging with reduced degradation of spatial resolution

Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe3+ doping in NaYF4:Yb,Er nanocrystals

Simultaneous size and luminescence control of NaYF4:Yb3+/RE3+ (RE=Tm, Ho) microcrystals via Li+ doping

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Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe³⁺ doping in NaYF₄:Yb,Er nanocrystals