scholarly journals Конверсия энергии в нанокристаллах Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-, легированных ионами Er-=SUP=-3+-=/SUP=-

2019 ◽  
Vol 61 (5) ◽  
pp. 872
Author(s):  
Е.С. Трофимова ◽  
В.А. Пустоваров ◽  
А.Ф. Зацепин
Keyword(s):  
Energy Transfer ◽  
Excited States ◽  
Upconversion Luminescence ◽  
Excitation Energy Transfer ◽  
Photoluminescence Spectra ◽  
Photoluminescence Decay ◽  
Luminescence Yield ◽  
The Matrix ◽  
Temperature Dependences ◽  
Kinetics Of

AbstractThe conversion of the energy absorbed by cubic Gd_2O_3 nanocrystals doped with Er^3+ and codoped with Yb^3+ and Zn^2+ ions in a temperature range of 95–425 K is studied at various concentrations of dopants. The photoluminescence spectra confirm the ability of excitation energy transfer from the Gd^3+ ions or the matrix towards the Er^3+ ions. The population of upper excited states in the Er^3+ ions depends on the way of excitation, which cause the alterations in the probability of multiphonon relaxation from the excited states to the radiative levels. The kinetics of photoluminescence decay exhibit the possible energy transfer from anionic defects created by extra doping with Zn^2+ ions. The temperature dependences of the upconversion luminescence yield for emission lines of 560 and 660 nm are found to be different.

Linker proteins enable ultrafast excitation energy transfer in the phycobilisome antenna system of Thermosynechococcus vulcanus

2016 ◽  
Vol 15 (1) ◽  
pp. 31-44 ◽  
Author(s):  
C. Nganou ◽  
L. David ◽  
N. Adir ◽  
M. Mkandawire
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
Antenna System ◽  
Kinetics Of

Comparison of kinetics of photoexcitation migration from PC620 to APC Core in extracted and intact pentacyclic phycobilisomes ofT. vulcanus. The extracted PBS does not have linker protein, while intact has them and they facilitate the migration.

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.

scholarly journals Mono- and Mixed Metal Complexes of Eu3+, Gd3+, and Tb3+ with a Diketone, Bearing Pyrazole Moiety and CHF2-Group: Structure, Color Tuning, and Kinetics of Energy Transfer between Lanthanide Ions

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2655
Author(s):  
Victoria E. Gontcharenko ◽  
Mikhail A. Kiskin ◽  
Vladimir D. Dolzhenko ◽  
Vladislav M. Korshunov ◽  
Ilya V. Taydakov ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Metal Complexes ◽  
Group Structure ◽  
Excitation Energy Transfer ◽  
Lanthanide Ions ◽  
X Ray Diffraction ◽  
Transfer Rates ◽  
Mixed Metal ◽  
Mixed Metal Complexes ◽  
Kinetics Of

Three novel lanthanide complexes with the ligand 4,4-difluoro-1-(1,5-dimethyl-1H-pyrazol-4-yl)butane-1,3-dione (HL), namely [LnL3(H2O)2], Ln = Eu, Gd and Tb, were synthesized, and, according to single-crystal X-ray diffraction, are isostructural. The photoluminescent properties of these compounds, as well as of three series of mixed metal complexes [EuxTb1-xL3(H2O)2] (EuxTb1-xL3), [EuxGd1-xL3(H2O)2] (EuxGd1-xL3), and [GdxTb1-xL3(H2O)2] (GdxTb1-xL3), were studied. The EuxTb1-xL3 complexes exhibit the simultaneous emission of both Eu3+ and Tb3+ ions, and the luminescence color rapidly changes from green to red upon introducing even a small fraction of Eu3+. A detailed analysis of the luminescence decay made it possible to determine the observed radiative lifetimes of Tb3+ and Eu3+ and estimate the rate of excitation energy transfer between these ions. For this task, a simple approximation function was proposed. The values of the energy transfer rates determined independently from the luminescence decays of terbium(III) and europium(III) ions show a good correlation.

scholarly journals The Peculiarities of Singlet Electronic Excitation Energy Transfer Processes in Alq3 Films

2020 ◽  
Vol 65 (3) ◽  
pp. 196
Author(s):  
O. M. Navozenko ◽  
V. M. Yashchuk ◽  
Yu. P. Piryatinski ◽  
D. Gudeiko ◽  
A. P. Naumenko ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Electronic Excitation ◽  
Excitation Energy Transfer ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy ◽  
Fluorescence Excitation ◽  
Time Resolved ◽  
Two Component ◽  
The Matrix

The absorption and luminescence of new boron-containing dyes in two-component films of Alq3 (matrix)-dye(impurity) (obtained by the method of thermal vacuum deposition) are studied. The comparison of the spectra of absorption, fluorescence, and fluorescence excitation of a dyes in one-component solutions and double-component films shows the existence of the effective electronic excitation energy transfer (EEET) from the matrix to dye molecules. Time-resolved spectra of two-component films also manifest strong EEET in these systems. For the estimation of the average exciton spreading length in Alq3 films, the diffusion model of the motion of singlet excitons is used. The diffusion coefficient is evaluated using time-resolved spectroscopy. The optimum concentrations of dyes in a light-emitting layer of OLED are evaluated based on experimental data and the used model of EEET.

scholarly journals Electronic coherence and the kinetics of inter-complex energy transfer in light-harvesting systems

2015 ◽  
Vol 17 (46) ◽  
pp. 30914-30924 ◽  
Author(s):  
Pengfei Huo ◽  
Thomas F. Miller III
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Excitation Energy Transfer ◽  
General System ◽  
Minor Role ◽  
Complex Energy ◽  
Transfer Rates ◽  
Harvesting Systems ◽  
A Minor ◽  
Kinetics Of

Comparison of inter-complex excitation energy transfer rates obtained in a general system (original, red) and in an alternative parameterization of the system that preserves static coherence while eliminating dynamic coherence (SCP, black) reveals that static coherence largely governs the kinetics of incoherent inter-complex EET in model light-harvesting networks, whereas dynamic coherence plays only a minor role.

Kinetics of radiationless energy transfer from upper excited states

1997 ◽  
Vol 274 (1-3) ◽  
pp. 171-176 ◽  
Author(s):  
E.N. Bodunov ◽  
M.N. Berberan-Santos ◽  
J.M.G. Martinho
Keyword(s):  
Energy Transfer ◽  
Excited States ◽  
Radiationless Energy Transfer ◽  
Kinetics Of

Kinetics of the Luminescence of Isoelectronic Rare-Earth Ions In III-V Semiconductors

1993 ◽  
Vol 301 ◽  
Author(s):  
H.J. Lozykowski
Keyword(s):  
Experimental Data ◽  
Energy Transfer ◽  
Rare Earth ◽  
Excited States ◽  
Quantitative Agreement ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Wide Range ◽  
Decay Times ◽  
Kinetics Of

ABSTRACTIn this work we have developed a model for the kinetics of the energy transfer from the host lattice to the localized core excited states of rare earth isoelectronic structured traps (REI-trap). We have derive a set of differential equations for semi-insulating semiconductor governing the kinetics of rare earth luminescence. The numerically simulated rise and decay times of luminescence show a good quantitative agreement with the experimental data obtained for InP:Yb, over a wide range of generation rates.

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