VIRGILI, Tersilla; BOTTA, Chiara; MRÓZ, Marta; PARRENIN, Laurie; BROCHON, Cyril; CLOUTET, Eric; PAVLOPOULOU, Eleni; HADZIIOANNOU, Georges; GEOGHEGAN, Mark

doi:10.3389/fchem.2019.00409

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Frontiers in Chemistry. 2019, vol. 7

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The photophysics of water and propan-1-ol suspensions of poly[N-9”-heptadecanyl-2,7-carbazole-alt−5,5-(4,7-di-2-thienyl-2′,1′,3′- benzothiadiazole)] (PCDTBT) nanoparticles and mesoparticles has been studied by ultrafast spectroscopy. High molar mass polymer (HMM > 20 kg/mol) forms nanoparticles with around 50 nm diameter via mini-emulsion post-polymerization, while low molar mass (LMM < 5 kg/mol) polymer prepared by dispersion polymerization results in particles with a diameter of almost one order of magnitude larger (450 ± 50 nm). In this study, the presence of excited-states and charge separated species was identified through UV pump and visible/near-infrared probe femtosecond transient absorption spectroscopy. A different behavior for the HMM nanoparticles has been identified compared to the LMM mesoparticles. The nanoparticles exhibit typical features of an energetically disordered conjugated polymer with a broad density of states, allowing for delayed spectral relaxation of excited states, while the mesoparticles show a J-aggregate-like behavior where interchain interactions are less efficient. Stimulated emission in the red-near infrared region has been found in the mesoparticles which indicates that theypresent a more energetically ordered system.< Réduire

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transient absorption spectroscopy

PCDTBT

nanoparticles

semiconducting polymers

optoelectronics

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Size-Dependent Photophysical Behavior of Low Bandgap Semiconducting Polymer Particles

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