Energy Migration and Energy Transfer in GdB3O6:Bi,Tb

1987 ◽  
pp. 569-569
Author(s):  
A. J. deVries
Keyword(s):  
Energy Transfer ◽  
Energy Migration

ENERGY TRANSFER IN THE RADIOLYSIS OF CYCLOPENTANE–CYCLOHEXANE MIXTURES

1964 ◽  
Vol 42 (12) ◽  
pp. 2872-2879 ◽  
Author(s):  
J. A. Stone
Keyword(s):  
Energy Transfer ◽  
Carbon Tetrachloride ◽  
Radical Change ◽  
Energy Migration ◽  
Hydrogen Atoms ◽  
Show Evidence

Energy transfer in the radiolysis of cyclopentane–cyclohexane mixtures has been studied by observing the yields of HD and D2 obtained when small amounts of cyclohexane-d12 are added. Energy migration occurs from cyclopentane to cyclohexane but this transfer can be prevented by the addition of carbon tetrachloride or iodine. The relative yields of the dimers (C6H11)2, C6H9C6H11, and (C5H3)2 show that the •C6H11 and •C5H9 radicals, which are the precursors of the dimers, can abstract hydrogen atoms from the solvent and may thus change their identity. Added iodine or carbon tetrachloride removes the diffusing radicals, and the residual dimer yield, which is unaffected by solute, has a composition determined solely by the composition of the mixtures. The yields of cyclohexene and cyclopentene show evidence of both energy transfer and radical change of identity.

Depolarization of Photoluminescence of Isotropic Solutions Produced by Excitation Energy Migration

1987 ◽  
Vol 42 (8) ◽  
pp. 813-818
Author(s):  
A. Kawski ◽  
J. Kamiński
Keyword(s):  
Experimental Data ◽  
Energy Transfer ◽  
Excitation Energy ◽  
Master Equation ◽  
Shell Model ◽  
Excitation Energy Transfer ◽  
Critical Distance ◽  
Energy Migration ◽  
Isotropic Solution ◽  
Fluorescence And Phosphorescence

A theory of the excitation energy transfer between like molecules in isotropic solution based on a centre or shell model of a primarily excited luminescent molecule and on the extended Förster “excitation master equation” has been elaborated. Fluorescence and phosphorescence depolarization are shown to be governed by singlet-singlet energy migration and described by the same expression. The comparison of the theoretical curve with the experimental data obtained by Gondo et al. (1975) for benzo[f]quinoline in ethanol glass at 77 K results in the following critical distance R0 for the excitation energy migration: 21.5 Å for fluorescence and phosphorescence, respectively.

Study on Energy Transfer and Energy Migration of Ca2Gd8(SiO4)6O2:Dy3+ Phosphor Films

2011 ◽  
Vol 11 (11) ◽  
pp. 9714-9716 ◽  
Author(s):  
X. Q. Wang ◽  
X. M. Han ◽  
C. M. Zhen
Keyword(s):  
Energy Transfer ◽  
Energy Migration

scholarly journals Luminescence: Probing Energy Migration through Precise Control of Interfacial Energy Transfer in Nanostructure (Adv. Mater. 6/2019)

2019 ◽  
Vol 31 (6) ◽  
pp. 1970041 ◽  
Author(s):  
Bo Zhou ◽  
Jinshu Huang ◽  
Long Yan ◽  
Xuelong Liu ◽  
Nan Song ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Interfacial Energy ◽  
Energy Migration ◽  
Precise Control

Competition between Energy Transfer and Energy Migration Processes in Neat and Eu3+-Doped TbPO4

2018 ◽  
Vol 122 (12) ◽  
pp. 6858-6864 ◽  
Author(s):  
Irene Carrasco ◽  
Fabio Piccinelli ◽  
Ivo Romet ◽  
Vitali Nagirnyi ◽  
Marco Bettinelli
Keyword(s):  
Energy Transfer ◽  
Energy Migration

Energy migration and energy transfer in the system Ce(III)/Tb(III) in β″-alumina crystals

1990 ◽  
Vol 168 (2) ◽  
pp. 211-218 ◽  
Author(s):  
R. Twardowski ◽  
M. Eyal ◽  
R. Reisfeld ◽  
L.A. Momoda ◽  
B. Dunn
Keyword(s):  
Energy Transfer ◽  
Energy Migration

Through space singlet energy transfers in light-harvesting systems and cofacial bisporphyrin dyads

2010 ◽  
Vol 14 (01) ◽  
pp. 55-63 ◽  
Author(s):  
Pierre D. Harvey ◽  
Christine Stern ◽  
Claude P. Gros ◽  
Roger Guilard
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Time Scale ◽  
Light Harvesting ◽  
Energy Migration ◽  
Triplet Energy ◽  
Energy Transfers ◽  
Harvesting Systems ◽  
Controlled Structure ◽  
And Migration

Recent discoveries from our research groups on the photophysics of a few cofacial bisporphyrin dyads for through space singlet and triplet energy transfers raised several important investigations about the mechanism of energy transfers and energy migration in light-harvesting devices, notably LH II, in the heavily investigated purple photosynthetic bacteria. The key feature is that for face-to-face and slipped dyads with controlled structure using rigid spacers or spacers with limited flexibilities, our fastest rates for singlet energy transfer are in the 10 × 109 s -1 (i.e. 100 ps time scale) for donor-acceptor distances of ~3.5–3.6 Å. The time scale for energy transfers between different bacteriochlorophylls, notably B800*→B850, is in the ps despite the long Mg ⋯ Mg separation (~18 Å). This short rate drastically contrasts with the well-accepted Förster theory. This review focuses on the photophysical processes and dynamics in LH II and compares these parameters with our investigated model dyads build upon octa-etio-porphyrin chromophores and rigid and semi-rigid spacers. The recently discovered role of the rhodopin glucoside (carotenoid) will be analyzed as possible relay for energy transfers, including the possibility of uphill processes at room temperature. In this context the concept of energy migration may be complemented by parallel relays and uphill processes. It is also becoming more obvious that the irreversible electron transfer at the reaction center (electron transfer from the special pair to the phaeophytin) renders the rates for energy transfer and migration faster precluding all possibility of back transfers.

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