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Badon A, Marceau JB, Allard C, Fossard F, Loiseau A, Cognet L, Flahaut E, Recher G, Izard N, Martel R, Gaufrès E. Fluorescence anisotropy using highly polarized emitting dyes confined inside BNNTs. MATERIALS HORIZONS 2023; 10:983-992. [PMID: 36644986 DOI: 10.1039/d2mh01239a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Polarized fluorescence emission of nanoscale emitters has been extensively studied for applications such as bioimaging, displays, and optical communication. Extending the polarization properties in large assemblies of compact emitters is, however, challenging because of self-aggregation processes, which can induce depolarization effects, quenching, and cancellations of molecular dipoles. Here we use α-sexithiophene (6T) molecules confined inside boron nitride nanotubes (6T@BNNTs) to induce fluorescence anisotropy in a transparent host. The experiments first indicate that individual 6T@BNNTs exhibit a high polarization extinction ratio, up to 700, at room temperature. Using aberration-corrected HRTEM, we show that the fluorescence anisotropy is consistent with a general alignment of encapsulated 6T molecules along the nanotube axis. The molecular alignment is weakly influenced by the nanotube diameter, a phenomenon ascribed to stronger molecule-to-sidewall interactions compared to intermolecular interactions. By stretching a flexible thin film made of transparent polymers mixed with 6T@BNNTs, we induce a macroscopic fluorescence anisotropy within the film. This work demonstrates that the dyes@BNNT system can be used as an easy-to-handle platform to induce fluorescence anisotropy in photonic materials.
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Affiliation(s)
- A Badon
- Laboratoire Photonique Numérique et Nanosciences, Institut d'Optique, CNRS UMR5298, Université de Bordeaux, F-33400 Talence, France.
| | - J-B Marceau
- Laboratoire Photonique Numérique et Nanosciences, Institut d'Optique, CNRS UMR5298, Université de Bordeaux, F-33400 Talence, France.
| | - C Allard
- Département de Génie Physique, Polytechnique Montréal, Montréal, Québec H3C 3A7, Canada
| | - F Fossard
- Laboratoire d'Étude des Microstructures, ONERA-CNRS, UMR104, Université Paris-Saclay, BP 72, 92322 Châtillon Cedex, France
| | - A Loiseau
- Laboratoire d'Étude des Microstructures, ONERA-CNRS, UMR104, Université Paris-Saclay, BP 72, 92322 Châtillon Cedex, France
| | - L Cognet
- Laboratoire Photonique Numérique et Nanosciences, Institut d'Optique, CNRS UMR5298, Université de Bordeaux, F-33400 Talence, France.
| | - E Flahaut
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, UMR CNRS-UPS-INP No. 5085, Université Toulouse 3 Paul Sabatier, Bât. CIRIMAT, 118, route de Narbonne, 31062 Toulouse cedex 9, France
| | - G Recher
- Laboratoire Photonique Numérique et Nanosciences, Institut d'Optique, CNRS UMR5298, Université de Bordeaux, F-33400 Talence, France.
| | - N Izard
- Laboratoire Charles Coulomb, UMR5221 CNRS-Université de Montpellier, 34095 Montpellier, France
| | - R Martel
- Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
| | - E Gaufrès
- Laboratoire Photonique Numérique et Nanosciences, Institut d'Optique, CNRS UMR5298, Université de Bordeaux, F-33400 Talence, France.
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Junghoefer T, Calzolari A, Baev I, Glaser M, Ciccullo F, Giangrisostomi E, Ovsyannikov R, Kielgast F, Nissen M, Schwarz J, Gallagher NM, Rajca A, Martins M, Casu MB. Magnetic behavior in metal-free radical thin films. Chem 2021. [DOI: 10.1016/j.chempr.2021.11.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Krumland J, Valencia AM, Cocchi C. Exploring organic semiconductors in solution: the effects of solvation, alkylization, and doping. Phys Chem Chem Phys 2021; 23:4841-4855. [PMID: 33605967 DOI: 10.1039/d0cp06085b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first-principles simulation of the electronic structure of organic semiconductors in solution poses a number of challenges that are not trivial to address simultaneously. In this work, we investigate the effects and the mutual interplay of solvation, alkylization, and doping on the structural, electronic, and optical properties of sexithiophene, a representative organic semiconductor molecule. To this end, we employ (time-dependent) density functional theory in conjunction with the polarizable-continuum model. We find that the torsion between adjacent monomer units plays a key role, as it strongly influences the electronic structure of the molecule, including energy gap, ionization potential, and band widths. Alkylization promotes delocalization of the molecular orbitals up to the first methyl unit, regardless of the chain length, leading to an overall shift of the energy levels. The alterations in the electronic structure are reflected in the optical absorption, which is additionally affected by dynamical solute-solvent interactions. Taking all these effects into account, solvents decrease the optical gap by an amount that depends on its polarity, and concomitantly increase the oscillator strength of the first excitation. The interaction with a dopant molecule promotes planarization. In such scenario, solvation and alkylization enhance charge transfer both in the ground state and in the excited state.
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Affiliation(s)
- Jannis Krumland
- Humboldt-Universität zu Berlin, Physics Department and IRIS Adlershof, 12489 Berlin, Germany.
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Farahvash A, Lee CK, Sun Q, Shi L, Willard AP. Machine learning Frenkel Hamiltonian parameters to accelerate simulations of exciton dynamics. J Chem Phys 2020; 153:074111. [DOI: 10.1063/5.0016009] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Affiliation(s)
- Ardavan Farahvash
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | - Qiming Sun
- Tencent America, Palo Alto, California 94306, USA
| | - Liang Shi
- Department of Chemistry and Chemical Biology, University of California, Merced, California 95343, USA
| | - Adam P. Willard
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Du Y, Wang L, Plunkett KN. 1,1′-Biaceanthrylene and 2,2′-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings. J Org Chem 2019; 85:79-84. [DOI: 10.1021/acs.joc.9b02118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yachu Du
- Department of Chemistry and Biochemistry and the Materials Technology Center, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Lichang Wang
- Department of Chemistry and Biochemistry and the Materials Technology Center, Southern Illinois University, Carbondale, Illinois 62901, United States
| | - Kyle N. Plunkett
- Department of Chemistry and Biochemistry and the Materials Technology Center, Southern Illinois University, Carbondale, Illinois 62901, United States
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