Photon Upconversion Through Tb<sup>3+</sup>‐Mediated Interfacial Energy Transfer

Zhou, Bo; Yang, Weifeng; Han, Sanyang; Sun, Qiang; Liu, Xiaogang

doi:10.1002/adma.201503482

Cited by 96 publications

(67 citation statements)

References 66 publications

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“…We first prepared the NaYbF 4 :Tm/Gd@NaYF 4 :A (A=Eu, Tb, Dy, and Sm) core–shell nanoparticles by using a two‐step coprecipitation method (see the Supporting Information) . In a typical experiment, the NaYbF 4 :Tm/Gd(1/50 mol %) core nanoparticles were first synthesized as seeds, followed by an epitaxial growth of the NaYF 4 :A (A=Eu, Tb, Dy, and Sm) shell layer.…”

Section: Figuresupporting

confidence: 59%

Constructing Interfacial Energy Transfer for Photon Up‐ and Down‐Conversion from Lanthanides in a Core–Shell Nanostructure

et al. 2016

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We report a new mechanistic strategy for controlling and modifying the photon emission of lanthanides in a core-shell nanostructure by using interfacial energy transfer. By taking advantage of this mechanism with Gd(3+) as the energy donor, we have realized efficient up- and down-converted emissions from a series of lanthanide emitters (Eu(3+) , Tb(3+) , Dy(3+) , and Sm(3+) ) in these core-shell nanoparticles, which do not need a migratory host sublattice. Moreover, we have demonstrated that the Gd(3+) -mediated interfacial energy transfer, in contrast to energy migration, is the leading process contributing to the photon emission of lanthanide dopants for the NaGdF4 @NaGdF4 core-shell system. Our finding suggests a new direction for research into better control of energy transfer at the nanometer length scale, which would help to stimulate new concepts for designing and improving photon emission of the lanthanide-based luminescent materials.

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Section: Figuresupporting

confidence: 59%

Constructing Interfacial Energy Transfer for Photon Up‐ and Down‐Conversion from Lanthanides in a Core–Shell Nanostructure

et al. 2016

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“…Unlike ESA based on single ions, ETU always occurs in two neighboring ions regardless of their chemical nature. [ 31,32 ] A typical ETU process undergoes as depicted in Figure 1 c: a) two neighboring ions respectively absorb a pump photon to reach their metastable level; b) then the excessive energy from one ion is transferred to one of its adjacent counterparts to make the latter to its excitation level, but the energy donor goes back to the ground level and releases a photon with higher energy than that of pump photons. The UCL effi ciency of ETU between the similar ions is remarkably low, which forces material scientists to conduct multidoped upconversion systems to improve UCL effi ciency.…”

Section: Dopants: Activators and Sensitizersmentioning

confidence: 99%

Current Advances in Lanthanide‐Doped Upconversion Nanostructures for Detection and Bioapplication

2016

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Along with the development of science and technology, lanthanide‐doped upconversion nanostructures as a new type of materials have taken their place in the field of nanomaterials. Upconversion luminescence is a nonlinear optical phenomenon, which absorbs two or more photons and emits one photon. Compared with traditional luminescence materials, upconversion nanostructures have many advantages, such as weak background interference, long lifetime, low excitation energy, and strong tissue penetration. These interesting nanostructures can be applied in anticounterfeit, solar cell, detection, bioimaging, therapy, and so on. This review is focused on the current advances in lanthanide‐doped upconversion nanostructures, covering not only basic luminescence mechanism, synthesis, and modification methods but also the design and fabrication of upconversion nanostructures, like core–shell nanoparticles or nanocomposites. At last, this review emphasizes the application of upconversion nanostructure in detection and bioimaging and therapy. Learning more about the advances of upconversion nanostructures can help us better exploit their excellent performance and use them in practice.

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“…[11][12][13] Few articles exist on achieving efficient upconversion emission from other rare-earth ions such as Tb 3+ and Eu 3+ . [14][15][16][17] To enrich multiplex luminescence probes, one of the few solutions is based on energy migration upconversion (EMU). 18,19 Typically, Tm 3+ ions are used to accumulate photon energy and transfer it to migrators (Gd 3+ ) to activate other luminescence centers.…”

Section: Introductionmentioning

confidence: 99%

Highly Enhanced Cooperative Upconversion Luminescence through Energy Transfer Optimization and Quenching Protection

Meng

Zhu

Qiu

et al. 2016

ACS Appl. Mater. Interfaces

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Upconversion luminescence nanomaterials have shown great potential in biological and physical applications because of their unique properties. However, limited research exists on the cooperative sensitization upconversion emission in Tb(3+) ions over Er(3+) ions and Tm(3+) ions because of its low efficiency. Herein, by optimizing the doping ratio of sensitizer and activator to maximize the utilization of the photon energy and introducing the CaF2 inert shell to shield sensitizer from quenchers, we synthesize ultrasmall NaYbF4:Tb@CaF2 nanoparticles with a significant enhancement (690-fold) in cooperative sensitization upconversion emission intensity, compared with the parent NaYbF4:Tb. The lifetime of Tb(3+) emission in NaYbF4:Tb@CaF2 nanoparticles is prolonged extensively to ∼3.5 ms. Furthermore, NaYbF4:Tb@CaF2 was applied in in vitro and in vivo bioimaging. The presented luminescence enhancement strategy provides cooperative sensitization upconversion with new opportunities for bioapplication.

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Photon Upconversion Through Tb³⁺‐Mediated Interfacial Energy Transfer

Cited by 96 publications

References 66 publications

Constructing Interfacial Energy Transfer for Photon Up‐ and Down‐Conversion from Lanthanides in a Core–Shell Nanostructure

Constructing Interfacial Energy Transfer for Photon Up‐ and Down‐Conversion from Lanthanides in a Core–Shell Nanostructure

Current Advances in Lanthanide‐Doped Upconversion Nanostructures for Detection and Bioapplication

Highly Enhanced Cooperative Upconversion Luminescence through Energy Transfer Optimization and Quenching Protection

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Photon Upconversion Through Tb3+‐Mediated Interfacial Energy Transfer

Cited by 96 publications

References 66 publications

Constructing Interfacial Energy Transfer for Photon Up‐ and Down‐Conversion from Lanthanides in a Core–Shell Nanostructure

Constructing Interfacial Energy Transfer for Photon Up‐ and Down‐Conversion from Lanthanides in a Core–Shell Nanostructure

Current Advances in Lanthanide‐Doped Upconversion Nanostructures for Detection and Bioapplication

Highly Enhanced Cooperative Upconversion Luminescence through Energy Transfer Optimization and Quenching Protection

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Photon Upconversion Through Tb³⁺‐Mediated Interfacial Energy Transfer