Excitation energy migration dynamics in upconversion nanomaterials

Tu, Langping; Liu, Xiaomin; Wu, Fei; Zhang, Hong

doi:10.1039/c4cs00168k

Cited by 265 publications

(180 citation statements)

References 47 publications

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“…This process is therefore ruled by the energy gap law as given by eqn (6) and (7). The temperature sensitivity of ET enables remote optical thermal sensing using luminescent materials, as discussed in Section 4.4.1 The phonon-assisted ET process can be assessed by the strong temperature dependence of ET.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Recent advances in energy transfer in bulk and nanoscale luminescent materials: from spectroscopy to applications

2015

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Transfer of energy occurs endlessly in our universe by means of radiation. Compared to energy transfer (ET) in free space, in solid state materials the transfer of energy occurs in a rather confined manner, which is usually mediated by real or virtual particles, including not only photons, but also electrons, phonons, and excitons. In the present review, we discuss the recent advances in optical ET by resonance mediated with photons in solid materials as well as their nanoscale counterparts, with focus on the photoluminescence behavior pertaining to ET between optically active centers, such as rare earth (RE) ions. This review begins with a brief discussion on the classification of optical ET together with an overview of the theoretical formulations and experimental method for the examination of ET. We will then present a comprehensive discussion on the ET in practical systems in which normal photoluminescence, upconversion and quantum cutting resulted from ET involving metal ions, QDs, organic species, 2D materials and plasmonic nanostructures. Diverse ET systems are therefore simply categorized into cases of ion-ion interactions and non-ion interactions. Special attention has been paid to the progress in the manipulation of spatially confined ET in nanostructured systems including core-shell structures, as well as the ET in multiple exciton generation found in QDs and organic molecules, which behave quite similarly to resonance ET between metal ion centers. Afterwards, we will discuss the broad spectrum of applications of ET in the aforementioned systems, including solid state lighting, solar energy utilization, bio-imaging and diagnosis, and sensing. In the closing part, along with a short summary, we discuss further research focus regarding the problems and possible future directions of optical ET in solids.

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Section: Experimental Methodsmentioning

confidence: 99%

“…[4][5][6][7][8][9][10][11] We will review optical ET in solid state materials here, with special emphasis paid on the recent advances in nanoscale systems. These investigations have led to the discovery of more efficient phosphors, laser materials, optical bio-probes, etc.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in energy transfer in bulk and nanoscale luminescent materials: from spectroscopy to applications

2015

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“…However, its effect is difficult to evaluate as the energy migration process is indistinguishable from energy transfer between sensitizers and activators. In our opinion, this dilemma can be solved by introducing a smart nanosystem termed “dopant ions’ spatial separation” (DISS) nanostructure 5k. By locating sensitizers and activators into different regions of a single nanoparticle, the three basic processes of UC (i.e.…”

mentioning

confidence: 99%

Precisely Tailoring Upconversion Dynamics via Energy Migration in Core–Shell Nanostructures

et al. 2018

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Upconversion emission dynamics have long been believed to be determined by the activator and its interaction with neighboring sensitizers. Herein this assumption is, however, shown to be invalid for nanostructures. We demonstrate that excitation energy migration greatly affects upconversion emission dynamics. “Dopant ions’ spatial separation” nanostructures are designed as model systems and the intimate link between the random nature of energy migration and upconversion emission time behavior is unraveled by theoretical modelling and confirmed spectroscopically. Based on this new fundamental insight, we have successfully realized fine control of upconversion emission time behavior (either rise or decay process) by tuning the energy migration paths in various specifically designed nanostructures. This result is significant for applications of this type of materials in super resolution spectroscopy, high‐density data storage, anti‐counterfeiting, and biological imaging.

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“…The demonstration of this energy migration, lifetime manipulation and energy transfer is an important contribution towards understanding and using these systems in applications 30 . In particular, the excitation dynamics and the role of diverse core-shell structures are the subjects of intense research in the fields of luminescent nanoparticles 31, 32 and our work provides insight into the external parameters needed to understand it and control it.…”

Section: Introductionmentioning

confidence: 97%

Sensitization, energy transfer and infra-red emission decay modulation in Yb3+-doped NaYF4 nanoparticles with visible light through a perfluoroanthraquinone chromophore

et al. 2017

Sci Rep

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Infra-red emission (980 nm) of sub 10 nm Yb3+-doped NaYF4 nanoparticles has been sensitized through the excitation of 2-hydroxyperfluoroanthraquinone chromophore (1,2,3,4,5,6,7-heptafluro-8-hydroxyanthracene-9,10-dione) functionalizing the nanoparticle surface. The sensitization is achieved with a broad range of visible light excitation (400–600 nm). The overall near infra-red (NIR) emission intensity of Yb3+ ions is increased by a factor 300 as a result of the broad and strong absorption of the chromophore compared with ytterbium’s intrinsic absorption. Besides the Yb3+ NIR emission, the hybrid composite shows organic chromophore-based visible emission in the orange-red region of the spectrum. We observe the energy migration process from the sensitized Yb3+ ions at the surface to those in the core of the particle using time-resolved optical spectroscopy. This highlights that the local environments for emitting Yb3+ ions at the surface and center of the nanoparticle are not identical, which causes important differences in the NIR emission dynamics. Based on the understanding of these processes, we suggest a simple strategy to control and modulate the decay time of the functionalized Yb3+-doped nanoparticles over a relatively large range by changing physical or chemical parameters in this model system.

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Excitation energy migration dynamics in upconversion nanomaterials

Cited by 265 publications

References 47 publications

Recent advances in energy transfer in bulk and nanoscale luminescent materials: from spectroscopy to applications

Recent advances in energy transfer in bulk and nanoscale luminescent materials: from spectroscopy to applications

Precisely Tailoring Upconversion Dynamics via Energy Migration in Core–Shell Nanostructures

Sensitization, energy transfer and infra-red emission decay modulation in Yb3+-doped NaYF4 nanoparticles with visible light through a perfluoroanthraquinone chromophore

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