Local‐field effect on the fluorescence relaxation of Tm<sup>3+</sup>:LaF<sub>3</sub> nanocrystals immersed in liquid medium

He, Enjie; Zheng, H.; Zhang, Xisheng; Qu, Shi-Xian

doi:10.1002/bio.1146

Cited by 12 publications

(10 citation statements)

References 25 publications

(30 reference statements)

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“…6. Experimental studies [42,47] in the index range of 1.3-1.7 have shown good agreement with the real-cavity model. Based on the real-cavity model for silicon, a significant dielectric enhancement factor EF D ¼ nL 2 ¼ 7:3 is obtained.…”

Section: Enhanced Emission From the Fabry-perot-like Waveguide Ressupporting

confidence: 59%

Anomalous enhanced emission from PbS quantum dots on a photonic-crystal microcavity

et al. 2011

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We report up to 75 times enhancement in emission from lithographically produced photonic crystals with postprocessing close-packed colloidal quantum-dot incorporation. In our analysis, we use the emission from a closepacked free-standing film as a reference. After discounting the angular redistribution effect, our analysis shows that the observed enhancement is larger than the combined effects of Purcell enhancement and dielectric enhancement with the microscopic local field. The additional enhancement mechanisms, which are consistent with all our observations, are thought to be spectral diffusion mediated by phonons and local polarization fluctuations that allow off-resonant excitons to emit at the cavity wavelengths.

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Section: Enhanced Emission From the Fabry-perot-like Waveguide Ressupporting

confidence: 59%

Anomalous enhanced emission from PbS quantum dots on a photonic-crystal microcavity

et al. 2011

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“…So far, experiments with doped NCs were analyzed in terms eq and , − and therefore experimental verification of the NC-cavity model is lacking. The experiments required to verify the validity of the various LF models are challenging, as one should be able to change the dielectric medium (density of optical states) without affecting the electronic properties of the emitter (contained in the parameter Γ 0 ) .…”

mentioning

confidence: 99%

Photonic Effects on the Radiative Decay Rate and Luminescence Quantum Yield of Doped Nanocrystals

2015

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Nanocrystals (NCs) doped with luminescent ions form an emerging class of materials. In contrast to excitonic transitions in semiconductor NCs, the optical transitions are localized and not affected by quantum confinement. The radiative decay rates of the dopant emission in NCs are nevertheless different from their bulk analogues due to photonic effects, and also the luminescence quantum yield (QY, important for applications) is affected. In the past, different theoretical models have been proposed to describe the photonic effects for dopant emission in NCs, with little experimental validation. In this work we investigate the photonic effects on the radiative decay rate of luminescent doped NCs using 4 nm LaPO4 NCs doped with Ce(3+) or Tb(3+) ions in different refractive index solvents and bulk crystals. We demonstrate that the measured influence of the refractive index on the radiative decay rate of the Ce(3+) emission, having near unity QY, is in excellent agreement with the theoretical nanocrystal-cavity model. Furthermore, we show how the nanocrystal-cavity model can be used to quantify the nonunity QY of Tb(3+)-doped LaPO4 NCs and demonstrate that, as a general rule, the QY is higher in media with higher refractive index.

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“…Due to their novel electronic and optical properties resulting from the 4f electrons, rare earth materials have attracted more research interest in the past few decades (9)(10)(11). Among the various rare earth materials, rare earth fluorides usually having high refractive indexes and low phonon energies have attracted more and more attention due to their wide potential applications in optical telecommunication, lasers, biochemical probes, infrared quantum counters, and medical diagnostics (12)(13)(14).…”

Section: Introductionmentioning

confidence: 99%

Ce³⁺/Tb³⁺ non‐/single‐/co‐doped K‐Lu‐F materials: synthesis, optical properties, and energy transfer

et al. 2015

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Using a hydrothermal method, Ce(3+) /Tb(3+) non-/single-/co-doped K-Lu-F materials have been synthesized. The X-ray diffraction (XRD) results suggest that the Ce(3+) and/or Tb(3+) doping had great effects on the crystalline phases of the final samples. The field emission scanning electron microscopy (FE-SEM) images indicated that the samples were in hexagonal disk or polyhedron morphologies in addition to some nanoparticles, which also indicated that the doping also had great effects on the sizes and the morphologies of the samples. The energy-dispersive spectroscopy (EDS) patterns illustrated the constituents of different samples. The enhanced emissions of Tb(3+) were observed in the Ce(3+) /Tb(3+) co-doped K-Lu-F materials. The energy transfer (ET) efficiency ηT were calculated based on the fluorescence yield. The ET mechanism from Ce(3+) to Tb(3+) was confirmed to be the dipole-quadrupole interaction inferred from the theoretical analysis and the experimental data. Copyright © 2015 John Wiley & Sons, Ltd.

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Local‐field effect on the fluorescence relaxation of Tm³⁺:LaF₃ nanocrystals immersed in liquid medium

Cited by 12 publications

References 25 publications

Anomalous enhanced emission from PbS quantum dots on a photonic-crystal microcavity

Anomalous enhanced emission from PbS quantum dots on a photonic-crystal microcavity

Photonic Effects on the Radiative Decay Rate and Luminescence Quantum Yield of Doped Nanocrystals

Ce³⁺/Tb³⁺ non‐/single‐/co‐doped K‐Lu‐F materials: synthesis, optical properties, and energy transfer

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Local‐field effect on the fluorescence relaxation of Tm3+:LaF3 nanocrystals immersed in liquid medium

Cited by 12 publications

References 25 publications

Anomalous enhanced emission from PbS quantum dots on a photonic-crystal microcavity

Anomalous enhanced emission from PbS quantum dots on a photonic-crystal microcavity

Photonic Effects on the Radiative Decay Rate and Luminescence Quantum Yield of Doped Nanocrystals

Ce3+/Tb3+ non‐/single‐/co‐doped K‐Lu‐F materials: synthesis, optical properties, and energy transfer

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Product

Resources

About

Local‐field effect on the fluorescence relaxation of Tm³⁺:LaF₃ nanocrystals immersed in liquid medium

Ce³⁺/Tb³⁺ non‐/single‐/co‐doped K‐Lu‐F materials: synthesis, optical properties, and energy transfer