Plasmon-enhanced fluorescence of CaF 2 :Eu 2+ nanocrystals by Ag nanoparticles

Ye, Weihao; Huang, Qiying; Jiao, Xianfu; Liu, Xiaotang; Hu, Gang

doi:10.1016/j.jallcom.2017.05.181

Cited by 16 publications

(10 citation statements)

References 79 publications

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“…This Eu 3+ emission improvement played by Au NPs can be attributed to the excitation field enhancement caused by the local surface plasmon resonance absorption effect of Au nanoparticles [58]. It is well-known in the literature that noble metal NPs can enhance the Eu 3+ luminescence and it can be explained by the radiating plasmons (RPs) model [59].In Fig. 9 it is been shown an illustration of this model in the molybdate structure [59].First of all, the stimulation of light on the Au NPs surface causes a local surface charge density increase, leading to the emergence of a high localized electromagnetic field around the Au NPs, which penetrates into the phosphor.…”

Section: Resultsmentioning

confidence: 99%

“…It is well-known in the literature that noble metal NPs can enhance the Eu 3+ luminescence and it can be explained by the radiating plasmons (RPs) model [59].In Fig. 9 it is been shown an illustration of this model in the molybdate structure [59].First of all, the stimulation of light on the Au NPs surface causes a local surface charge density increase, leading to the emergence of a high localized electromagnetic field around the Au NPs, which penetrates into the phosphor. Finally, this strong electromagnetic field increases the luminescence emission by changing the crystal field around the activator ions.…”

Section: Resultsmentioning

confidence: 99%

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Red phosphor based on Eu3+-doped Y2(MoO4)3 incorporated with Au NPs synthesized via Pechini's method

et al. 2018

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Structural, morphological and spectroscopic characterization of the Eu 3+-doped Y 2 (MoO 4) 3 red phosphor incorporated with Au nanoparticles (Au NPs) synthesized via Pechini's method is reported in the present study. In order to evaluate the Au NPs and Eu 3+ ions influence on the molybdate structure, the Y 2 (MoO 4) 3 , Y 2 (MoO 4) 3 :Eu 3+ , Y 2 (MoO 4) 3 /Au and Y 2 (MoO 4) 3 :Eu 3+ /Au samples were produced and fully investigated. All samples obtained at relatively low temperature, i.e., 650°C, show molybdate as the unique phase with high crystallinity assisted by both Eu 3+ ions and Au NPs. Water molecules detected in the molybdate structure probably are distorting MoO 4 , YO 6 and EuO 6 polyhedra similarly to the Au NPs incorporated in the same lattice. These Au NPs are spherical-shaped with a diameter near to 46 nm and they are located on the molybdate particle surface. The Eu 3+-doped phosphors, with or without the presence of Au NPs, exhibit intense red luminescence characteristic of the Eu 3+ ion inserted in low-symmetry sites. However, the Au NPs increase the radiative emission rate and absolute quantum yield of the Eu 3+ 5 D 0 emitter state due to the excitation field enhancement caused by the local surface plasmon resonance absorption effect of gold nanoparticles, which was confirmed by diffuse reflectance measurements. Finally, the Eu 3+ quantum efficiency enhancement to 92% played by the gold nanoparticles and the high red color purity qualify the obtained phosphor for photonic applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Red phosphor based on Eu3+-doped Y2(MoO4)3 incorporated with Au NPs synthesized via Pechini's method

et al. 2018

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“…Recently there has been considerable interest to utilize surface plasmons in metallic thin films to improve the overall extraction efficiency of luminescent materials [1][2][3][4][5][6][7][8][9][10][11][12] and light emitting diodes (LED). [13][14][15][16][17][18][19][20][21][22] The presence of surface plasmons could contribute to providing additional modes to which the emitting ions could radiate thus affecting their radiative lifetime.…”

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confidence: 99%

Dipole-Dipole Non-Radiative Energy Transfer Mediated by Surface Plasmons on a Metallic Interface

Mishra¹,

Collins

2019

ECS J. Solid State Sci. Technol.

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We have investigated the surface plasmon-mediated energy transfer between two optically active ions in vacuum near a metallic surface using methods of molecular quantum electrodynamics. We have studied the electric dipole-electric dipole energy transfer process only, this being the most dominant mechanism in interionic interaction between two ions in a medium when their wavefunctions do not significantly overlap. The matrix elements for energy transfer, hence energy transfer rates, are calculated using two classes of Feynman diagrams. The intermediate states for one class of diagrams do not satisfy the energy conservation principle, hence they are purely virtual states. Of particular interest are the dependencies of the energy transfer process on (1) the relative positions of the ions with respect to one another projected onto the interface and (2) the distance of each ion from the metal surface. The overall energy transfer process has been found to have both the short range and long-range components, the former being driven by virtual plasmons and the latter by the real plasmons in a non-lossy medium.

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“…The presence of a metallic surface affects the luminescence characteristics of a nearby optically active ion. This feature has been exploited in solid state light sources to extract light form within the LEDs [2][3][4][5][6][7][8][9][10][11] and to extract more photons from both the LED and the phosphor composites [12][13][14][15][16][17][18][19][20][21][22][23] in specific configurations. Many lighting laboratories are exploring plasmon-structured LED surfaces and phosphor composites to extract more light in certain directions.…”

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confidence: 99%

Investigation of Purcell Factor for an Activator Ion due to Surface Plasmon Modes

Collins¹,

Mishra²

2019

ECS J. Solid State Sci. Technol.

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We considered earlier the role of the surface plasmon states in the spontaneous decay of an optically active ion in proximity to a flat, metallic surface. 1 In this work we have extended our earlier results to obtain an expression for the density of plasmon states accessible to the ion. We express the spontaneous decay rate of the ion into the surface plasmon field in terms of the density of final states and the appropriate "Einstein" B-coefficient, which depends on the matrix elements of the ion-surface plasmon interaction. Next we derive an expression for the contribution of the surface plasmons to the total radiative decay rate, and determine the Purcell factor of this system. Finally, calculations are presented showing how the Purcell factor for an optically active ion near a silver surface depends on the wavelength of the transition and distance of the ion from the surface.

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Plasmon-enhanced fluorescence of CaF 2 :Eu 2+ nanocrystals by Ag nanoparticles

Cited by 16 publications

References 79 publications

Red phosphor based on Eu3+-doped Y2(MoO4)3 incorporated with Au NPs synthesized via Pechini's method

Red phosphor based on Eu3+-doped Y2(MoO4)3 incorporated with Au NPs synthesized via Pechini's method

Dipole-Dipole Non-Radiative Energy Transfer Mediated by Surface Plasmons on a Metallic Interface

Investigation of Purcell Factor for an Activator Ion due to Surface Plasmon Modes

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