The Size Confinement Effect for Ln3+ (Ln = Tm or Eu) Concentration Quenching and Energy Transfer in Y2O3 Nanocrystals

2014 ◽  
Vol 14 (5) ◽  
pp. 3893-3897
Author(s):  
Changwen Wang ◽  
Qingyu Meng
Keyword(s):  
Energy Transfer ◽  
Concentration Quenching ◽  
Confinement Effect ◽  
Size Confinement

The Size Confinement Effect for Eu3+ Concentration Quenching and Energy Transfer in YVO4 Nanocrystal

2016 ◽  
Vol 16 (4) ◽  
pp. 3772-3776 ◽  
Author(s):  
Qingyu Meng ◽  
Jiaqi Dai ◽  
Wenjun Sun ◽  
Changwen Wang
Keyword(s):  
Energy Transfer ◽  
Exchange Interaction ◽  
Electric Dipole ◽  
Dipole Interaction ◽  
Concentration Quenching ◽  
Confinement Effect ◽  
Precipitation Method ◽  
Range Interaction ◽  
Operating Range ◽  
Size Confinement

YVO4:Eu3+ nanocrystal powders (∼30 nm) with different doping concentrations were prepared using a precipitation method. Bulky powders (∼500 nm) were obtained by annealing the nanopowders at high temperature. The concentration quenching of luminescent centers and energy transfer in YVO4: Eu3+ powders were investigated. It was found that quenching concentration for Eu3+ 5D0→7F2 transition emission in nanopowders is distinctly higher than that in bulk powders. The type of energy transfer that caused concentration quenching was identified to be electric dipole–dipole interaction in bulk powders and exchange interaction in nanopowders. The electric dipole–dipole interaction is a long-range interaction (operating range of several nanometers). The size confinement effect of boundary in nanoparticles has obvious inhibitory effect on electric dipole–dipole interaction, and hardly affect the exchange interaction which is a short-range interaction (operating range several angstroms). The electric dipole–dipole interaction is restrained by particle boundary in nanopowders. So energy transfer of Eu3+ ions in nanomaterials is dominated by exchange interaction, and quenching concentration of nanomaterials is higher than in bulky materials.

Origin of Concentration Quenching in Ytterbium Coordination Polymers: Phonon-Assisted Energy Transfer

2017 ◽  
Vol 2018 (5) ◽  
pp. 561-567 ◽  
Author(s):  
Shun Omagari ◽  
Takayuki Nakanishi ◽  
Yuichi Hirai ◽  
Yuichi Kitagawa ◽  
Tomohiro Seki ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Coordination Polymers ◽  
Concentration Quenching

Remarks on Concentration Quenching in Chlorophyll

1982 ◽  
Vol 37 (2) ◽  
pp. 150-153 ◽  
Author(s):  
C. Bojarski
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quantum Yield ◽  
Energy Transfer Process ◽  
Excitation Energy Transfer ◽  
Lipid Vesicles ◽  
Concentration Quenching ◽  
Monomeric Form ◽  
Chlorophylls A And B ◽  
Energy Degradation ◽  
Concentration Changes

Abstract A quantitative analysis of fluorescence self-quenching of chlorophylls a and b in ether as well as chlorophyll a in lipid vesicles and liposomes has been carried out. It is demonstrated that concentration changes of the fluorescence quantum yield can be correctly described by a Förster-type excitation energy transfer process between chlorophyll molecules in the monomeric form if part of the transfers leads to energy degradation.

Investigation of energy transfer and concentration quenching of Dy3+ luminescence in Gd(BO2)3 by means of fluorescence dynamics

2013 ◽  
Vol 578 ◽  
pp. 72-76 ◽  
Author(s):  
Xinmin Zhang ◽  
Fangui Meng ◽  
Wenlan Li ◽  
Sun Il Kim ◽  
Young Moon Yu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Concentration Quenching

Cell-size confinement effect on protein diffusion in crowded poly(ethylene)glycol solution

2018 ◽  
Vol 20 (13) ◽  
pp. 8842-8847 ◽  
Author(s):  
Chiho Watanabe ◽  
Miho Yanagisawa
Keyword(s):  
Ethylene Glycol ◽  
Cell Size ◽  
Molecular Diffusion ◽  
Macromolecular Crowding ◽  
Confinement Effect ◽  
Protein Diffusion ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Glycol Solution ◽  
Size Confinement

Micrometric membrane confinements and macromolecular crowding synergistically regulate molecular diffusion.

scholarly journals Effect of Random Nanostructured Metallic Environments on Spontaneous Emission of HITC Dye

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2135
Author(s):  
Sangeeta Rout ◽  
Zhen Qi ◽  
Ludvig S. Petrosyan ◽  
Tigran V. Shahbazyan ◽  
Monika M. Biener ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Theoretical Model ◽  
Spontaneous Emission ◽  
Concentration Quenching ◽  
Decay Rates ◽  
Laser Dye ◽  
Strongly Coupled ◽  
Strong Energy ◽  
Concentration Quenching Of Luminescence ◽  
Kinetics Of

We have studied emission kinetics of HITC laser dye on top of glass, smooth Au films, and randomly structured porous Au nanofoams. The observed concentration quenching of luminescence of highly concentrated dye on top of glass (energy transfer to acceptors) and the inhibition of the concentration quenching in vicinity of smooth Au films were in accord with our recent findings. Intriguingly, the emission kinetics recorded in different local spots of the Au nanofoam samples had a spread of the decay rates, which was large at low dye concentrations and became narrower with increase of the dye concentration. We infer that in different subvolumes of Au nanofoams, HITC molecules are coupled to the nanofoams weaker or stronger. The inhibition of the concentration quenching in Au nanofoams was stronger than on top of smooth Au films. This was true for all weakly and strongly coupled subvolumes contributing to the spread of the emission kinetics. The experimental observations were explained using theoretical model accounting for change in the Förster radius caused by the strong energy transfer to metal.

Excitation Energy Transfer among Chlorophyll a Molecules in Polystyrene: Concentration Dependence of Quantum Yield, Polarization and Lifetime of Fluorescence

1978 ◽  
Vol 33 (11-12) ◽  
pp. 863-869 ◽  
Author(s):  
D. Wong ◽  
Govindjee ◽  
H. Merkelo ◽  
K. Vacek
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Excitation Energy ◽  
Chlorophyll A ◽  
Excitation Energy Transfer ◽  
Concentration Quenching ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy ◽  
Polarization Of Fluorescence ◽  
Total Concentrations

Electronic excitation energy transfer was studied for chlorophyll a in a solid solution of poly­styrene by measuring the concentration quenching of quantum yield, polarization, and lifetime of fluorescence. The concentration quenching of the experimental fluorescence quantum yield is adequately described by Kelly and Porter’s empirical formula (Proc. Roy. Soc., Lond. A 315, 149, 1970), and of polarization of fluorescence by the Jablonski theory (Acta Phys. Pol., 14, 295, 1955). With increasing concentration of chlorophyll a, the fluorescence peak at 672 nm (mainly monomer) is red-shifted, the intensity of the emission peak at ∼730 nm (mainly aggregate) relative to that at the shorter wavelength is increased. The R̅0 values, calculated by using total concentrations, for the emission at 672 nm and 730 nm are 73 ± 2 Å and 45 ±1 Å, respectively. This may suggest that the chlorophyll monomers have a greater efficiency of energy transfer than the aggregates, which fluoresce at ∼ 730 nm.

Prediction of the Influence of Concentration on the Photoluminescence Decay Time of Solutions

1980 ◽  
Vol 35 (3) ◽  
pp. 345-349 ◽  
Author(s):  
R. Twardowski ◽  
C. Bojarski
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Decay Time ◽  
Excitation Energy Transfer ◽  
Fluorescence Decay ◽  
Concentration Quenching ◽  
Photoluminescence Decay ◽  
Donor And Acceptor ◽  
Fluorescence Decay Time ◽  
Acceptor Molecules

Abstract A formula for the donor photoluminescence decay time in its dependence on the concentrations of donor D and acceptor A has been derived from equations for the non-radiative excitation energy transfer between randomly distributed donor and acceptor molecules within a nonactive medium. In the limit [D]/[A] → 0 the formula becomes identical with that of Galanin [7], while in the absence of concentration quenching the fluorescence decay time does not depend on the concentrations.

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