Disorder-induced exciton scattering in the light-harvesting systems of purple bacteria: Influence on the anisotropy of emission and band→band transitions

1998 ◽  
Vol 109 (2) ◽  
pp. 855-865 ◽  
Author(s):  
Ranjit Kumble ◽  
Robin M. Hochstrasser
Keyword(s):  
Light Harvesting ◽  
Purple Bacteria ◽  
Harvesting Systems ◽  
Exciton Scattering

scholarly journals Exciton scattering in light-harvesting systems of purple bacteria

2001 ◽  
Vol 94-95 ◽  
pp. 447-450 ◽  
Author(s):  
Pavel Heřman ◽  
Ulrich Kleinekathöfer ◽  
Ivan Barvı́k ◽  
Michael Schreiber
Keyword(s):  
Light Harvesting ◽  
Purple Bacteria ◽  
Harvesting Systems ◽  
Exciton Scattering

scholarly journals Manipulation of supramolecular 2D assembly of functional dyes toward artificial light-harvesting systems

2015 ◽  
Vol 87 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Yohei Ishida
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Short Review ◽  
Artificial Light ◽  
Effective Utilization ◽  
Host Interactions ◽  
Excellent Research ◽  
Harvesting Systems ◽  
Functional Dyes

AbstractIn recent years, excellent research has revealed that light-harvesting systems (LHSs) are composed of beautifully aligned chlorophyll molecules; the regulated alignment of chlorophylls is responsible for the efficient and selective light-harvesting energy transfer processes in purple bacteria. This finding led to the construction of a regularly arranged assembly of functional dyes as a step toward fabricating artificial LHSs. While most approaches toward the construction of dye assemblies have depended on molecular interactions such as covalent, coordination, and hydrogen bonds, my approach involves guest–host interactions using an inorganic nanosheet as the host material. This short review presents the construction of a 2D dye assembly and its effective utilization in artificial light-harvesting applications. Owing to the highly stable and uniform 2D alignment of functional dyes on inorganic nanosheets, nearly 100 % singlet–singlet energy transfer and efficient light-harvesting were achieved. I believe that the results presented herein will contribute to the construction of efficient photochemical reaction systems in supramolecular host–guest assemblies, which may facilitate the realization of artificial photosynthesis.

scholarly journals Fully Quantum Modeling of Exciton Diffusion in Mesoscale Light Harvesting Systems

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3291
Author(s):  
Fulu Zheng ◽  
Lipeng Chen ◽  
Jianbo Gao ◽  
Yang Zhao
Keyword(s):  
Light Harvesting ◽  
Purple Bacteria ◽  
Time Dependent ◽  
Graphic Processing Units ◽  
Exciton Diffusion ◽  
Quantum Mechanical Treatment ◽  
Exciton Transfer ◽  
Harvesting Systems ◽  
Intractable Problem ◽  
Computational Resources

It has long been a challenge to accurately and efficiently simulate exciton–phonon dynamics in mesoscale photosynthetic systems with a fully quantum mechanical treatment due to extensive computational resources required. In this work, we tackle this seemingly intractable problem by combining the Dirac–Frenkel time-dependent variational method with Davydov trial states and implementing the algorithm in graphic processing units. The phonons are treated on the same footing as the exciton. Tested with toy models, which are nanoarrays of the B850 pigments from the light harvesting 2 complexes of purple bacteria, the methodology is adopted to describe exciton diffusion in huge systems containing more than 1600 molecules. The superradiance enhancement factor extracted from the simulations indicates an exciton delocalization over two to three pigments, in agreement with measurements of fluorescence quantum yield and lifetime in B850 systems. With fractal analysis of the exciton dynamics, it is found that exciton transfer in B850 nanoarrays exhibits a superdiffusion component for about 500 fs. Treating the B850 ring as an aggregate and modeling the inter-ring exciton transfer as incoherent hopping, we also apply the method of classical master equations to estimate exciton diffusion properties in one-dimensional (1D) and two-dimensional (2D) B850 nanoarrays using derived analytical expressions of time-dependent excitation probabilities. For both coherent and incoherent propagation, faster energy transfer is uncovered in 2D nanoarrays than 1D chains, owing to availability of more numerous propagating channels in the 2D arrangement.

scholarly journals Broadband 2D Electronic Spectroscopy Reveals a Carotenoid Dark State in Purple Bacteria

Science ◽  
2013 ◽  
Vol 340 (6128) ◽  
pp. 52-56 ◽  
Author(s):  
Evgeny E. Ostroumov ◽  
Rachel M. Mulvaney ◽  
Richard J. Cogdell ◽  
Gregory D. Scholes
Keyword(s):  
Energy Flow ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Electronic Spectroscopy ◽  
Natural Light ◽  
Dark State ◽  
The Past ◽  
Transfer Processes ◽  
Harvesting Systems ◽  
Underlying Mechanisms

Although the energy transfer processes in natural light-harvesting systems have been intensively studied for the past 60 years, certain details of the underlying mechanisms remain controversial. We performed broadband two-dimensional (2D) electronic spectroscopy measurements on light-harvesting proteins from purple bacteria and isolated carotenoids in order to characterize in more detail the excited-state manifold of carotenoids, which channel energy to bacteriochlorophyll molecules. The data revealed a well-resolved signal consistent with a previously postulated carotenoid dark state, the presence of which was confirmed by global kinetic analysis. The results point to this state’s role in mediating energy flow from carotenoid to bacteriochlorophyll.

Efficient artificial light-harvesting systems based on aggregation-induced emission constructed in supramolecular gels

Soft Matter ◽  
2021 ◽  
Author(s):  
Xinxian Ma ◽  
bo qiao ◽  
Jinlong Yue ◽  
JingJing Yu ◽  
yutao geng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rhodamine B ◽  
Fluorescent Dyes ◽  
Light Harvesting ◽  
Artificial Light ◽  
Efficient Energy Transfer ◽  
Aggregation Induced Emission ◽  
Efficient Energy ◽  
Harvesting Systems ◽  
Acyl Hydrazone

Based on a new designed acyl hydrazone gelator (G2), we developed an efficient energy transfer supramolecular organogel in glycol with two different hydrophobic fluorescent dyes rhodamine B (RhB) and acridine...

scholarly journals The molecular mechanisms of light adaption in light-harvesting complexes of purple bacteria revealed by a multiscale modeling

2019 ◽  
Vol 10 (42) ◽  
pp. 9650-9662 ◽  
Author(s):  
Felipe Cardoso Ramos ◽  
Michele Nottoli ◽  
Lorenzo Cupellini ◽  
Benedetta Mennucci
Keyword(s):  
Multiscale Modeling ◽  
Molecular Mechanisms ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Spectral Tuning ◽  
Light Harvesting Complexes

The spectral tuning of LH2 antenna complexes arises from H-bonding, acetyl torsion, and inter-chromophore couplings.

B800–B850 coherence correlates with energy transfer rates in the LH2 complex of photosynthetic purple bacteria

2015 ◽  
Vol 17 (46) ◽  
pp. 30805-30816 ◽  
Author(s):  
Cathal Smyth ◽  
Daniel G. Oblinsky ◽  
Gregory D. Scholes
Keyword(s):  
Energy Transfer ◽  
Quantum Information ◽  
Information Science ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Quantum Information Science ◽  
Light Harvesting Complex ◽  
Transfer Rates ◽  
Photosynthetic Purple Bacteria

Delocalization of a model light-harvesting complex is investigated using multipartite measures inspired by quantum information science.

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