scholarly journals Artificial quantum photosynthetic materials

2021 ◽  
Author(s):  
James Quach ◽  
Sabrina L. Slimani ◽  
Roman Kostecki ◽  
Ahmed Nuri Kursunlu ◽  
Tak W. Kee ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Coherence ◽  
Transient Absorption ◽  
Light Harvesting ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Photon Absorption ◽  
Light Harvesting Complexes ◽  
Classical Energy ◽  
Artificial Photosynthetic

Photosynthesis has been shown to be a highly efficient process for energy transfer in plants and bacteria. It has been proposed that quantum mechanics plays a key role in this energy transfer process. There has been evidence that photosynthetic systems may exhibit quantum coherence. As artificial light-harvesting complexes have been proposed to mimic photosynthesis, it is prudent that artificial photosynthetic materials should also be tested for quantum coherence. To date, such studies have not been reported. In this work, we examine one such system, the BODIPY light harvesting complex (LHC), which has been shown to exhibit classical energy transfer via Förster resonance energy transfer. We compare the photon absorption of the LHC with the BODIPY chromophore by performing UV-visible, transient absorption, broadband pump-probe (BBPP) and two-dimensional electronic (2DES) spectroscopy. The 2DES and BBPP show evidence for quantum coherence, with oscillation frequencies of 100 cm-1 and 600 cm-1, which are attributable to vibronic, or exciton-phonon type coupling. Further computational analysis suggests strong couplings of the molecular orbitals of the LHC resulting from the stacking of neighbouring BODIPY chromophore units may contribute to undesirable hypochromic effects .

scholarly journals A photosynthetic antenna complex foregoes unity carotenoid-to-bacteriochlorophyll energy transfer efficiency to ensure photoprotection

2020 ◽  
Vol 117 (12) ◽  
pp. 6502-6508 ◽  
Author(s):  
Dariusz M. Niedzwiedzki ◽  
David J. K. Swainsbury ◽  
Daniel P. Canniffe ◽  
C. Neil Hunter ◽  
Andrew Hitchcock
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Light Harvesting ◽  
Protein Complexes ◽  
Fluorescence Emission ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Light Harvesting Complexes ◽  
Antenna Complex ◽  
Pigment Protein Complexes

Carotenoids play a number of important roles in photosynthesis, primarily providing light-harvesting and photoprotective energy dissipation functions within pigment–protein complexes. The carbon–carbon double bond (C=C) conjugation length of carotenoids (N), generally between 9 and 15, determines the carotenoid-to-(bacterio)chlorophyll [(B)Chl] energy transfer efficiency. Here we purified and spectroscopically characterized light-harvesting complex 2 (LH2) fromRhodobacter sphaeroidescontaining theN= 7 carotenoid zeta (ζ)-carotene, not previously incorporated within a natural antenna complex. Transient absorption and time-resolved fluorescence show that, relative to the lifetime of the S1state of ζ-carotene in solvent, the lifetime decreases ∼250-fold when ζ-carotene is incorporated within LH2, due to transfer of excitation energy to the B800 and B850 BChlsa. These measurements show that energy transfer proceeds with an efficiency of ∼100%, primarily via the S1→ Qxroute because the S1→ S0fluorescence emission of ζ-carotene overlaps almost perfectly with the Qxabsorption band of the BChls. However, transient absorption measurements performed on microsecond timescales reveal that, unlike the nativeN≥ 9 carotenoids normally utilized in light-harvesting complexes, ζ-carotene does not quench excited triplet states of BChla, likely due to elevation of the ζ-carotene triplet energy state above that of BChla. These findings provide insights into the coevolution of photosynthetic pigments and pigment–protein complexes. We propose that theN≥ 9 carotenoids found in light-harvesting antenna complexes represent a vital compromise that retains an acceptable level of energy transfer from carotenoids to (B)Chls while allowing acquisition of a new, essential function, namely, photoprotective quenching of harmful (B)Chl triplets.

Enhanced light harvesting through Förster resonance energy transfer in polymer–small molecule ternary system

2017 ◽  
Vol 5 (5) ◽  
pp. 1136-1148 ◽  
Author(s):  
Amreen A. Hussain ◽  
Arup R. Pal
Keyword(s):  
Energy Transfer ◽  
Ternary System ◽  
Performance Enhancement ◽  
Light Harvesting ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Ternary Blend ◽  
New Approach ◽  
System P ◽  
Ternary Structure

A conceptually new approach to fabricate a robust ternary structure is introduced for light harvesting devices. An interesting photophysical mechanism of the ternary blend in a real device is highlighted where FRET strongly contributes to the performance enhancement of the device.

Photoinduced energy transfer in dye encapsulated polymer nanoparticle–CdTe quantum dot light harvesting assemblies

2015 ◽  
Vol 2 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Simanta Kundu ◽  
Santanu Bhattacharyya ◽  
Amitava Patra
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Quantum Dot ◽  
Light Harvesting ◽  
Nile Red ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cdte Quantum Dots ◽  
Cdte Quantum Dot ◽  
Red Dye

The efficient resonance energy transfer from CdTe quantum dots (donors) to Nile Red dye (acceptor) encapsulated PMMA nanoparticles for light harvesting is described.

Understanding the effects of the co-sensitizing ratio on the surface potential, electron injection efficiency, and Förster resonance energy transfer

2020 ◽  
Vol 22 (10) ◽  
pp. 5568-5576
Author(s):  
Jie Yang ◽  
Xing-Liang Peng ◽  
Zhu-Zhu Sun ◽  
Shuai Feng ◽  
Wei-Lu Ding ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solar Cell ◽  
Surface Potential ◽  
Light Harvesting ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Injection Efficiency ◽  
Infra Red ◽  
Uv Visible ◽  
Electron Injection Efficiency

Multiple absorbers that function in different absorption regions (near infra-red (NIR) and UV-Visible (UV-Vis)) have been widely used in solar cell applications to enhance the light-harvesting.

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