Upconversion superburst with sub-2 μs lifetime

Wu, Yiming; Xu, Jiahui; Poh, Eng Tuan; Liang, Liangliang; Liu, Hailong; Yang, Joel K. W.; Qiu, Cheng‐Wei; Vallée, Renaud A. L.; Liu, Xiaogang

doi:10.1038/s41565-019-0560-5

Cited by 147 publications

(121 citation statements)

References 30 publications

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“…We used the radiative decay rate ratio and the net UCL EF of the microbead region and the planar region to solve the mathematical model (Supporting Information). Even though the surface plasmonic effects were not as advantageous as the gap plasmonic effects for reducing the upconverted photon lifetimes,27 the surface plasmonic effects enhanced internal quantum processes, such as the rate of energy transfer from the donor ions to the acceptor ions and NIR absorption efficiency. Both the NIR absorption efficiency parameter (δ) and the internal energy transfer rate (ε) in the UIMBM platform were generally enhanced relative to those in the reference platform.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, a plasmonic platform can serve as a resonator to accommodate and trap incident light 10,24,25. It can also act as a “hot spot” for the formation of a strong near‐field at the interface between the metal nanostructures and the underlying insulator to support surface and/or gap plasmon polaritons 26,27. Recent experimental studies indicate that the overall plasmonic effects increase UCL intensity 16,17.…”

Section: Introductionmentioning

confidence: 99%

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A Multi‐Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles

Ahn

Yeo

Jung

et al. 2020

Adv Funct Materials

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Upconversion nanoparticles (UCNPs) have been integrated with photonic platforms to overcome the intrinsically low quantum efficiency limit of upconversion luminescence (UCL). However, platforms based on thin films lack transferability and flexibility, which hinders their broader and more practical application. A plasmonic structure is developed that works as a multi‐functional platform for flexible, transparent, and washable near‐infrared (NIR)‐to‐visible UCL films with ultra‐strong UCL intensity. The platform consists of dielectric microbeads decorated with plasmonic metal nanoparticles on an insulator/metal substrate. Distinct improvements in NIR confinement, visible light extraction, and boosted plasmonic effects for upconversion are observed. With weak NIR excitation, the UCL intensity is higher by three orders of magnitude relative to the reference platform. When the microbeads are organized in a square lattice array, the functionality of the platform can be expanded to wearable and washable UCL films. The platform can be transferred to transparent, flexible, and foldable films and still emit strong UCL with a wide viewing angle.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Multi‐Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles

Ahn

Yeo

Jung

et al. 2020

Adv Funct Materials

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“…[27] To directly characterize the change of PL intensity, PL EF is introduced. [40][41][42]48] In this work, it is defined by dividing the luminescence intensity of LP (i.e., with nanodisks) to A exciton in pristine WSe 2 monolayer at the same flake, as shown in Figure 1c In region I, a gradual increase of emission intensity is observed. In region II, the factor first decreases to a minimum at = 42 meV, and then it grows until = 80 meV.…”

Section: Characterizations Of Strong Couplingmentioning

confidence: 99%

Spontaneous Emission of Plasmon‐Exciton Polaritons Revealed by Ultrafast Nonradiative Decays

Shan

Liu

Wang

et al. 2020

Laser & Photonics Reviews

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Spontaneous emission can be altered by external electromagnetic environment with the bridge of local density of optical states. Microcavities have been widely integrated to accelerate the irreversible spontaneous decay, known as the Purcell effect. However, the Purcell effect breaks down in the strong coupling regime, where the light‐matter interaction is not a perturbation to Fermi's golden rule. Here, it is found that the emission intensity of plasmon–exciton polaritons is asymmetrically dependent on the spectral detuning, confirming the collapse of Purcell effect in strongly coupled systems. Ultrafast nonradiative decays of polaritons play a significant role in revealing the polariton emission intensity. The nonradiative effect is not affected by the coherent energy exchange since final states of nonradiative decays are optically dark and decoupled from Rabi oscillations. Moreover, the nonradiative effect is still valid under intermediate coupling and agrees with the Purcell effect, which suggests its universality at a variety of coupling regimes. This study opens up a successful approach to investigate spontaneous emission in cavity quantum electrodynamics, which is insightful to photonic and opto‐electronic applications based on exciton‐polaritons.

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“…Furthermore, RE 3+ -doped fluorides exhibit characteristic properties, such as high ionicity, low refractive index, wide band gap, and low phonon energy. KMgF 3 (Schuyt and Williams, 2018 ), NaYF 4 (Wu et al, 2019 , 2020 ), NaGdF 4 (Yi et al, 2019 ), and LaF 3 (Bekah et al, 2016 ; Nampoothiri et al, 2017 ) have been investigated and exhibit high quantum yields and long luminescent lifetimes. RE 3+ -doped fluorides have been attracting attentions for several years due to the wide variety of technological applications including biomedical researches (All et al, 2019 ; Yan et al, 2019 ), biosensors (Vijayan et al, 2019 ), bioimaging (Hu et al, 2016 ; Han et al, 2017 ; Zeng et al, 2019 ), radiation detection (Ju et al, 2017 ), optoelectronic devices (Wu et al, 2018 ), and so on.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Weak Chemiluminescence Enhanced by Cerium-Doped LaF3 Nanoparticles: A Potential Nitrite Analysis Method

Wang

Huang

et al. 2020

Front. Chem.

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In this work, cerium-doped LaF 3 nanoparticles (LaF 3 :Ce NPs) were successfully synthesized and characterized. Its chemiluminescence (CL) property was studied, and it was amazingly found that it intensely enhanced the ultra-weak CL of the NaNO 2-H 2 O 2 system. The CL mechanism was systematically investigated and suggested to be the recombination of electron-injected and hole-injected LaF 3 :Ce NPs. The new CL system was developed to be a facile, original, and direct method for nitrite analysis. Experimental conditions were optimized and then a satisfactory linear relationship between CL intensity and nitrite concentration was obtained. This work introduced a new pathway for the research and application of traditional fluoride NPs doped with RE 3+ .

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Upconversion superburst with sub-2 μs lifetime

Cited by 147 publications

References 30 publications

A Multi‐Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles

A Multi‐Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles

Spontaneous Emission of Plasmon‐Exciton Polaritons Revealed by Ultrafast Nonradiative Decays

Ultra-Weak Chemiluminescence Enhanced by Cerium-Doped LaF3 Nanoparticles: A Potential Nitrite Analysis Method

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