Spontaneous emission in dielectric nanoparticles

Pukhov, K. K.; Basiev, Tasoltan T.; Orlovskii, Yu.V.

doi:10.1134/s0021364008130043

Cited by 47 publications

(37 citation statements)

References 30 publications

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“…These theories apply to ED allowed transitions and are not appropriate for 4f N -4f N transitions, although they have been applied to the forced dipole luminescence of Eu 3+ in various media. It has more recently been pointed out that since the linear sizes of nanoparticles are considerably smaller than light wavelengths, the expression for the rate of spontaneous emission (A nano ) also needs to be modified from the bulk expression (A bulk ) [186,187]. It turns out that the ratio A nano /A bulk can be estimated without recourse to a specific local-field model.…”

Section: Luminescence Of Lanthanide Nanomaterialsmentioning

confidence: 98%

Lanthanide Luminescence in Solids

Tanner

2010

Lanthanide Luminescence

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A tutorial introduction to the spectra of lanthanide ions is given. The chapter begins with a brief comparison of luminescence of lanthanide ions (Ln 3+ ) in the solid, liquid, and gas phases. Then a description of the importance of nonradiative versus radiative processes is made. The various types of transition of lanthanide ions encountered are then introduced: 4f N -4f N ; 4f N -4f NÀ1 5d; charge transfer; host band-to-band; and defect site or impurity transitions. Reference is briefly made to the spectra of dipositive ions. The luminescence of lanthanide ions in non-lanthanide hosts is examined, and the importance of locating the relative positions of Ln 3+ energy levels relative to the host band gap is stressed. Some of the various upconversion phenomena, including second harmonic generation, twophoton absorption, ground state/excited state absorption, energy transfer upconversion, and photon avalanche, are then described with reference to Ln 3+ and Ln 3+ -TM n+ (transition metal) systems. The experimental distinctions of which particular process is operative in a given system are explained by considering the power, concentration, and lifetime dependences, and the upconversion excitation spectrum. Some applications of lanthanide luminescence are briefly reviewed and a mention of the luminescence in nanomaterials is also included.

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Section: Luminescence Of Lanthanide Nanomaterialsmentioning

confidence: 98%

Lanthanide Luminescence in Solids

Tanner

2010

Lanthanide Luminescence

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“…The spontaneous emission lifetime determined from the long exponential late stage ( τ R =1139 μs) (Figure (green curve)) is longer than that measured in bulk crystal ( τ R =780 μs) [18] that confirms the low fluorescence quenching and the small sizes of the NPs. The longer spontaneous emission decay in the NPs versus bulk crystal is the result of the influence on the spontaneous emission probability A of lower refractive index of ambient air comparing to that for the LaF 3 crystal …”

Section: Resultsmentioning

confidence: 98%

“…Our previous experiments with HTMW synthesis showed that the presence or absence of this surfactant affects only dispersibility and particles size, but has no effect on their crystallinity . Having NPs of the same size is crucial for comparison of their optical properties, as, for example, the fluorescence spontaneous decay rate and the fluorescence quenching kinetics depend on the size of the NPs.…”

Section: Resultsmentioning

confidence: 99%

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Relation of Crystallinity and Fluorescent Properties of LaF₃ :Nd³⁺ Nanoparticles Synthesized with Different Water-Based Techniques

et al. 2017

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We use two water based synthetic approaches to LaF 3 :Nd 3 + nanoparticles (NPs), hydrothermal microwave treatment (HTMW) and co-precipitation (CO) technique, with different temperature of the reaction mixture to study the correlation between the degree of crystallinity of LaF 3 :Nd 3 + NPs and their fluorescence properties. We showed that the fluorescence spectra and quenching kinetics can be a powerful tool to reveal the crystal lattice defects, namely agglomerations of the dopant ions (Nd 3 + ) and the OH À positioned in the volume of the doped NPs. We found that reduced number of such crystal lattice defects as Nd 3 + pairs and clusters and the OH groups in the volume of the HTMW NPs leads to much higher fluorescence brightness than for CO NPs. The higher temperature of reaction mixture during HTMW synthesis results in better crystallinity and much higher fluorescence brightness of the produced NPs. But we believe that these results could be applied more generally to the development of synthetic strategies for bright fluorescent NPs. In sum, it's not the condition of NPs surface, but the degree of their crystallinity should be a major concern while choosing the synthetic path, as it generally predetermines their fluorescent properties.

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“…(24)- (26). We also give another example of a phenomenological macroscopic model developed by Pukhov et al [54] to describe the local-field effects on the radiative lifetime in composite optical materials . The authors point out that mere replacement of the refractive index n of a bulk material with the refractive index n eff of a composite material in Eqs.…”

Section: Macroscopic Theoriesmentioning

confidence: 99%

Local-field effects in nanostructured photonic materials

Dolgaleva

Boyd

2012

Adv. Opt. Photon.

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It is well known that the optical response of a medium depends on the local field acting on an individual emitter rather than on the macroscopic average field in the medium. The local field depends very sensitively on the microcopic environment in an optical medium. It is thus possible to achieve a significant control over the local field by intermixing homogeneous materials on a nanoscale to produce composite optical materials. A combination of local-field effects and nanostructuring provides new degrees of freedom for manipulating the optical properties of photonic materials. Especially interesting opportunities open up in the nonlinear optical regime where the material response depends on the local-field correction as a power law. The goal of this review is to present a conceptual overview of the influence of local-field effects on the optical properties of photonic materials, both homogeneous and composite. We also give a summary of recent achievements in controlling the optical properties by local-field effects and nanostructuring.

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Spontaneous emission in dielectric nanoparticles

Cited by 47 publications

References 30 publications

Lanthanide Luminescence in Solids

Lanthanide Luminescence in Solids

Relation of Crystallinity and Fluorescent Properties of LaF₃ :Nd³⁺ Nanoparticles Synthesized with Different Water-Based Techniques

Local-field effects in nanostructured photonic materials

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Spontaneous emission in dielectric nanoparticles

Cited by 47 publications

References 30 publications

Lanthanide Luminescence in Solids

Lanthanide Luminescence in Solids

Relation of Crystallinity and Fluorescent Properties of LaF3 :Nd3+ Nanoparticles Synthesized with Different Water-Based Techniques

Local-field effects in nanostructured photonic materials

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Relation of Crystallinity and Fluorescent Properties of LaF₃ :Nd³⁺ Nanoparticles Synthesized with Different Water-Based Techniques