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Gelzinis A, Chmeliov J, Tutkus M, Vitulskienė E, Franckevičius M, Büchel C, Robert B, Valkunas L. Fluorescence quenching in aggregates of fucoxanthin-chlorophyll protein complexes: Interplay of fluorescing and dark states. BIOCHIMICA ET BIOPHYSICA ACTA. BIOENERGETICS 2024; 1865:149030. [PMID: 38163538 DOI: 10.1016/j.bbabio.2023.149030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/29/2023] [Accepted: 12/21/2023] [Indexed: 01/03/2024]
Abstract
Diatoms, a major group of algae, account for about a quarter of the global primary production on Earth. These photosynthetic organisms face significant challenges due to light intensity variations in their underwater habitat. To avoid photodamage, they have developed very efficient non-photochemical quenching (NPQ) mechanisms. These mechanisms originate in their light-harvesting antenna - the fucoxanthin-chlorophyll protein (FCP) complexes. Spectroscopic studies of NPQ in vivo are often hindered by strongly overlapping signals from the photosystems and their antennae. Fortunately, in vitro FCP aggregates constitute a useful model system to study fluorescence (FL) quenching in diatoms. In this work, we present streak-camera FL measurements on FCPa and FCPb complexes, isolated from a centric diatom Cyclotella meneghiniana, and their aggregates. We find that spectra of non-aggregated FCP are dominated by a single fluorescing species, but the FL spectra of FCP aggregates additionally contain contributions from a redshifted emissive state. We relate this red state to a charge transfer state between chlorophyll c and chlorophyll a molecules. The FL quenching, on the other hand, is due to an additional dark state that involves incoherent energy transfer to the fucoxanthin carotenoids. Overall, the global picture of energy transfer and quenching in FCP aggregates is very similar to that of major light-harvesting complexes in higher plants (LHCII), but microscopic details between FCPs and LHCIIs differ significantly.
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Affiliation(s)
- Andrius Gelzinis
- Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio Ave. 9-III, 10222 Vilnius, Lithuania
| | - Jevgenij Chmeliov
- Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio Ave. 9-III, 10222 Vilnius, Lithuania
| | - Marijonas Tutkus
- Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania; Institute of Biotechnology, Life Sciences Center, Vilnius University, Saulėtekio Ave. 7, 10257 Vilnius, Lithuania
| | - Ernesta Vitulskienė
- Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania
| | - Marius Franckevičius
- Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania
| | - Claudia Büchel
- Institute of Molecular Biosciences, Goethe University Frankfurt, Max-von-Laue Straße 9, 60438 Frankfurt, Germany
| | - Bruno Robert
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Leonas Valkunas
- Department of Molecular Compound Physics, Center for Physical Sciences and Technology, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania; Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio Ave. 9-III, 10222 Vilnius, Lithuania.
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Shih C, Lin C, Chen K, Amin NRA, Luo D, Hsu I, Akbar AK, Biring S, Lu C, Chen B, Yang S, Lee J, Liu S. Semi-Transparent, Pixel-Free Upconversion Goggles with Dual Audio-Visual Communication. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2302631. [PMID: 37737620 PMCID: PMC10625064 DOI: 10.1002/advs.202302631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/02/2023] [Indexed: 09/23/2023]
Abstract
The intractable brittleness and opacity of the crystalline semiconductor restrict the prospect of developing low-cost imaging systems. Here, infrared visualization technologies are established with large-area, semi-transparent organic upconversion devices that bring high-resolution invisible images into sight without photolithography. To exploit all photoinduced charge carriers, a monolithic device structure is proposed built on the infrared-selective, single-component charge generation layer of chloroaluminum phthalocyanine (ClAlPc) coupled to two visible light-emitting layers manipulated with unipolar charges. Transient pump-probe spectroscopy reveals that the ClAlPc-based device exhibits an efficient charge dissociation process under forward bias. This process is indicated by the prompt and strong features of electroabsorption screening. Furthermore, by imposing the electric field, the ultrafast excited state dynamic suggests a prolonged charge carrier lifetime from the ClAlPc, which facilitates the charge utilization for upconversion luminance. For the first time, >30% of the infrared photons are utilized without photomultiplication strategies owing to the trivial spectrum overlap between ClAlPc and the emitter. In addition, the device can broadcast the acoustic signal by synchronizing the device frequency with the light source, which enables to operate it in dual audio-visual mode. The work demonstrates the potential of upconversion devices for affordable infrared imaging in wearable electronics.
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Affiliation(s)
- Chun‐Jen Shih
- Graduate Institute of Photonics and Optoelectronics and Department of Electrical EngineeringNational Taiwan UniversityTaipei10617Taiwan
- Organic Electronics Research Center and Department of Electronic EngineeringMing Chi University of TechnologyNew Taipei City24301Taiwan
| | - Chao‐Yang Lin
- Robinson Research Institute, Faculty of EngineeringVictoria University of WellingtonWellington6012New Zealand
| | - Kai Chen
- Robinson Research Institute, Faculty of EngineeringVictoria University of WellingtonWellington6012New Zealand
- MacDiarmid Institute for Advanced Materials and NanotechnologyWellington6012New Zealand
- The Dodd‐Walls Centre for Photonic and Quantum TechnologiesDunedin9016New Zealand
| | - Nurul Ridho Al Amin
- Organic Electronics Research Center and Department of Electronic EngineeringMing Chi University of TechnologyNew Taipei City24301Taiwan
| | - Dian Luo
- Organic Electronics Research Center and Department of Electronic EngineeringMing Chi University of TechnologyNew Taipei City24301Taiwan
| | - I‐Sheng Hsu
- Organic Electronics Research Center and Department of Electronic EngineeringMing Chi University of TechnologyNew Taipei City24301Taiwan
| | - Abdul Khalik Akbar
- Organic Electronics Research Center and Department of Electronic EngineeringMing Chi University of TechnologyNew Taipei City24301Taiwan
| | - Sajal Biring
- Organic Electronics Research Center and Department of Electronic EngineeringMing Chi University of TechnologyNew Taipei City24301Taiwan
| | - Chih‐Hsuan Lu
- Institute of Photonics TechnologiesNational Tsing Hua UniversityHsinchu300044Taiwan
| | - Bo‐Han Chen
- Institute of Photonics TechnologiesNational Tsing Hua UniversityHsinchu300044Taiwan
| | - Shang‐Da Yang
- Institute of Photonics TechnologiesNational Tsing Hua UniversityHsinchu300044Taiwan
| | - Jiun‐Haw Lee
- Graduate Institute of Photonics and Optoelectronics and Department of Electrical EngineeringNational Taiwan UniversityTaipei10617Taiwan
| | - Shun‐Wei Liu
- Organic Electronics Research Center and Department of Electronic EngineeringMing Chi University of TechnologyNew Taipei City24301Taiwan
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