Trap-site formation and trap-controlled triplet energy migration in phenanthrene copolymer films

1989 ◽  
Vol 22 (5) ◽  
pp. 2207-2213 ◽  
Author(s):  
Shinzaburo Ito ◽  
Norio Numata ◽  
Hideaki Katayama ◽  
Masahide Yamamoto
Keyword(s):  
Energy Migration ◽  
Site Formation ◽  
Trap Site ◽  
Triplet Energy ◽  
Copolymer Films

Triplet Energy Migration in Poly(4-methacryloylbenzophenone-co-methyl methacrylate) Films:  Temperature Dependence and Chromophore Concentration Dependence

1996 ◽  
Vol 29 (5) ◽  
pp. 1589-1594 ◽  
Author(s):  
Akira Tsuchida ◽  
Masahide Yamamoto ◽  
William R. Liebe ◽  
Richard D. Burkhart ◽  
Kyoji Tsubakiyama
Keyword(s):  
Methyl Methacrylate ◽  
Temperature Dependence ◽  
Concentration Dependence ◽  
Energy Migration ◽  
Triplet Energy ◽  
Chromophore Concentration

scholarly journals Triplet energy migration in polymer langmuir-blodgett films.

1993 ◽  
Vol 6 (1) ◽  
pp. 105-112
Author(s):  
KENJI HISADA ◽  
HIDEAKI KATAYAMA ◽  
SHINZABURO ITO ◽  
MASAHIDE YAMAMOTO
Keyword(s):  
Energy Migration ◽  
Triplet Energy ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

scholarly journals Preorganized Chromophores Facilitate Triplet Energy Migration, Annihilation and Upconverted Singlet Energy Collection

2016 ◽  
Vol 138 (20) ◽  
pp. 6541-6549 ◽  
Author(s):  
Prasenjit Mahato ◽  
Nobuhiro Yanai ◽  
Melinda Sindoro ◽  
Steve Granick ◽  
Nobuo Kimizuka
Keyword(s):  
Energy Migration ◽  
Triplet Energy

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.

High-Resolution Photochemical Reaction Using Triplet-Sensitizer Probes

2004 ◽  
Vol 838 ◽  
Author(s):  
Hideki Miki ◽  
Akira Otomo ◽  
Shinro Mashiko
Keyword(s):  
Energy Transfer ◽  
Photochemical Reaction ◽  
Focal Point ◽  
Substrate Surface ◽  
Energy Migration ◽  
Photochemical Reactions ◽  
Donor Molecule ◽  
Fluorescent Properties ◽  
Triplet Energy ◽  
Functional Sites

ABSTRACTWe propose molecular-scale photochemical-reaction control using triplet-triplet (T-T) energy transfer from a donor molecule attached on a probe to an acceptor on an insulator surface. In this work, we studied the feasibility of photochemical reactions on a substrate surface using a triplet sensitizer probe. We observed an efficient T-T energy transfer from Michler's ketone on the substrate to an acceptor molecule, cinnamoyl group, on the other substrate facing it. Approximately a quarter of the cinnamoyl groups were dimerized by triplet sensitization. We used a cone-shaped dendron molecule to avoid sensitizer self-quenching caused by the triplet energy migration within the probe surface. We then confirmed efficient site separation of the cone's focal point by measuring the absorption and fluorescent properties of the rhodamine B attached to the focal point. The generation-three dendrons provide enough distance between the functional sites on the probe to reduce singlet energy transfer and it should control triplet energy migration.

Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies

2016 ◽  
Vol 52 (31) ◽  
pp. 5354-5370 ◽  
Author(s):  
Nobuhiro Yanai ◽  
Nobuo Kimizuka
Keyword(s):  
Excitation Power ◽  
Energy Migration ◽  
Molecular Assemblies ◽  
Triplet Energy ◽  
Feature Article ◽  
Highly Efficient ◽  
Recent Emergence

This Feature Article reviews an emerging field of triplet energy migration-based photon upconversion (TEM-UC) that allows highly efficient photon upconversion at low excitation power.

scholarly journals Correction: Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies

2017 ◽  
Vol 53 (3) ◽  
pp. 655-655 ◽  
Author(s):  
Nobuhiro Yanai ◽  
Nobuo Kimizuka
Keyword(s):  
Energy Migration ◽  
Molecular Assemblies ◽  
Triplet Energy ◽  
Recent Emergence

Correction for ‘Recent emergence of photon upconversion based on triplet energy migration in molecular assemblies’ by Nobuhiro Yanai et al., Chem. Commun., 2016, 52, 5354–5370.

Triplet energy migration in poly (acrylophenone): dependence on polymeric tacticity

1981 ◽  
Vol 14 (6) ◽  
pp. 1680-1688 ◽  
Author(s):  
T. Kilp ◽  
J. E. Guillet
Keyword(s):  
Energy Migration ◽  
Triplet Energy
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