Improving upconversion luminescence efficiency in Er3+-doped NaYF4 nanocrystals by two-color laser field

Yao, Yunhua; Xu, Cheng; Zheng, Yi; Yang, Chengshuai; Liu, Pei; Ding, Jun; Jia, Tianqing; Qiu, Jianrong; Zhang, Shian; Sun, Zhenrong

doi:10.1007/s10853-016-9849-z

Cited by 20 publications

(7 citation statements)

References 44 publications

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“…In the few studies on optical modulation of UCNPs, highly efficient optical depletion of upconversion luminescence has not been reported in major groups of UCNPs (NaYF 4 :Yb 3+ , Er 3+ /Tm 3+ /Ho 3+ ) that provide bright luminescence upon NIR excitation, except a demonstration of optical inhibition of upconversion luminescence in low-efficiency YAG:Pr 3+ nanoparticles emitting toxic UV light under a complicated excitation scheme with limited applications in biomedical areas 24 . The research efforts exploring co-irradiation by additional wavelengths have usually resulted in luminescence enhancement rather than silencing due to the presence of complicated photon recycling pathways among the lanthanide dopants under multi-wavelength excitation 25 , 26 . In our previous study on another upconversion system (NaYF 4 :Yb 3+ , Er 3+ ), the first optical depletion of Er 3+ emission was shown by inducing excited-state absorption (ESA), intrinsically different from the mechanism we propose in the present study, but the efficiency needed improvement for applications 27 .…”

Section: Introductionmentioning

confidence: 99%

Achieving high-efficiency emission depletion nanoscopy by employing cross relaxation in upconversion nanoparticles

et al. 2017

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Stimulated emission depletion microscopy provides a powerful sub-diffraction imaging modality for life science studies. Conventionally, stimulated emission depletion requires a relatively high light intensity to obtain an adequate depletion efficiency through only light–matter interaction. Here we show efficient emission depletion for a class of lanthanide-doped upconversion nanoparticles with the assistance of interionic cross relaxation, which significantly lowers the laser intensity requirements of optical depletion. We demonstrate two-color super-resolution imaging using upconversion nanoparticles (resolution ~ 66 nm) with a single pair of excitation/depletion beams. In addition, we show super-resolution imaging of immunostained cytoskeleton structures of fixed cells (resolution ~ 82 nm) using upconversion nanoparticles. These achievements provide a new perspective for the development of photoswitchable luminescent probes and will broaden the applications of lanthanide-doped nanoparticles for sub-diffraction microscopic imaging.

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Section: Introductionmentioning

confidence: 99%

Achieving high-efficiency emission depletion nanoscopy by employing cross relaxation in upconversion nanoparticles

et al. 2017

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“…Yao et al. proposed a two‐color laser field combining the 850 nm and 980 nm lasers to improve the green and red upconversion luminescence efficiency in Er 3 + ‐doped NaYF 4 nanocrystals, and also achieved upconversion enhancement in Yb 3 + /Er 3 + ‐codoped glass by combining the 800 nm and 980 nm laser fields …”

Section: Excitation Manipulation Of Upconversion Nanoparticlesmentioning

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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“…[13][14][15] Moreover, the up-converting luminescence can also be improved under co-excited condition with two different wavelength lasers. [16][17][18][19] Several groups have analyzed the luminescent behaviors of Er 3+ / Yb 3+ co-doped materials for they show strong green emissions. [20][21][22] Besides the sensitizer and activator, the host matrix also plays an important role in up-conversion luminescence.…”

Section: +mentioning

confidence: 99%

“…Surface plasmon resonance of noble metals has been used to overcome this drawback . Moreover, the up‐converting luminescence can also be improved under co‐excited condition with two different wavelength lasers …”

Section: Introductionmentioning

confidence: 99%

Enhanced green emissions of Er³⁺/Yb³⁺ co‐doped Gd₂(MoO₄)₃ by co‐excited up‐conversion processes

Hao

et al. 2017

Luminescence

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Improving the emission from rare earth ions doped materials is of great importance to broaden their application in bio-imaging, photovoltaics and temperature sensing. The green emissions of , the enhancement mechanism was discussed. Moreover, the result of temperature-dependent enhancement revealed that the enhancement factor reached its maximum (2.5) as the sample heated to 120°C, which is due to the competition of two major thermal effects acting in the co-excited up-conversion processes.In addition, the same enhancement of green emissions was also observed in [4] and in vitro/in vivo biological application. [5][6][7] However, because of their small absorption cross-section, the up-converting luminescence is not strong enough in many practical applications. To overcome this drawback, Yb 3+, acted as sensitizer, has been co-doped into the materials to transfer 980 nm energy to Ln 3+ . [8,9] Intriguingly, the luminescence can also be enhanced through the core-shell structure, which can eliminate energy dissipation to nanoparticle' surface. [10][11][12] Surface plasmon resonance of noble metals has been used to overcome this drawback. [13][14][15] Moreover, the up-converting luminescence can also be improved under co-excited condition with two different wavelength lasers. [16][17][18][19] Several groups have analyzed the luminescent behaviors of Er 3+ / Yb 3+ co-doped materials for they show strong green emissions. [20][21][22] Besides the sensitizer and activator, the host matrix also plays an important role in up-conversion luminescence. Because of its low toxicity, thermal stability and high photo-chemical stability, [23][24][25][26] Gd 2 (MoO 4 ) 3 was chosen as the host matrix in our work.In this work, we greatly increase the green emissions of Abbreviations used: I 980 , the integral intensity of green emissions under excitation with a 980 nm; I 808 , the integral intensity of green emissions under excitation with a 808 nm laser; I 980+808 , integral intensity of green emissions under co-excitation with both the 980 and 808 nm lasers; TEM, transmission electron microscopy; XRD, X-ray diffraction.

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Improving upconversion luminescence efficiency in Er3+-doped NaYF4 nanocrystals by two-color laser field

Cited by 20 publications

References 44 publications

Achieving high-efficiency emission depletion nanoscopy by employing cross relaxation in upconversion nanoparticles

Achieving high-efficiency emission depletion nanoscopy by employing cross relaxation in upconversion nanoparticles

Photon Upconversion Kinetic Nanosystems and Their Optical Response

Enhanced green emissions of Er³⁺/Yb³⁺ co‐doped Gd₂(MoO₄)₃ by co‐excited up‐conversion processes

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Improving upconversion luminescence efficiency in Er3+-doped NaYF4 nanocrystals by two-color laser field

Cited by 20 publications

References 44 publications

Achieving high-efficiency emission depletion nanoscopy by employing cross relaxation in upconversion nanoparticles

Achieving high-efficiency emission depletion nanoscopy by employing cross relaxation in upconversion nanoparticles

Photon Upconversion Kinetic Nanosystems and Their Optical Response

Enhanced green emissions of Er3+/Yb3+ co‐doped Gd2(MoO4)3 by co‐excited up‐conversion processes

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Enhanced green emissions of Er³⁺/Yb³⁺ co‐doped Gd₂(MoO₄)₃ by co‐excited up‐conversion processes