دورية أكاديمية
Optical Gain in Semiconducting Polymer Nano and Mesoparticles.
العنوان: | Optical Gain in Semiconducting Polymer Nano and Mesoparticles. |
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المؤلفون: | Geoghegan, Mark, Mróz, Marta M., Botta, Chiara, Parrenin, Laurie, Brochon, Cyril, Cloutet, Eric, Pavlopoulou, Eleni, Hadziioannou, Georges, Virgili, Tersilla, Chiasera, Alessandro |
المصدر: | Molecules; Feb2021, Vol. 26 Issue 4, p1138-1138, 1p |
مصطلحات موضوعية: | STIMULATED emission, LASER pumping, ULTRAVIOLET lasers, OPTICAL films, MOLECULAR interactions, CONJUGATED polymers |
مستخلص: | The presence of excited-states and charge-separated species was identified through UV and visible laser pump and visible/near-infrared probe femtosecond transient absorption spectroscopy in spin coated films of poly[N-9″-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) nanoparticles and mesoparticles. Optical gain in the mesoparticle films is observed after excitation at both 400 and 610 nm. In the mesoparticle film, charge generation after UV excitation appears after around 50 ps, but little is observed after visible pump excitation. In the nanoparticle film, as for a uniform film of the pure polymer, charge formation was efficiently induced by UV excitation pump, while excitation of the low energetic absorption states (at 610 nm) induces in the nanoparticle film a large optical gain region reducing the charge formation efficiency. It is proposed that the different intermolecular interactions and molecular order within the nanoparticles and mesoparticles are responsible for their markedly different photophysical behavior. These results therefore demonstrate the possibility of a hitherto unexplored route to stimulated emission in a conjugated polymer that has relatively undemanding film preparation requirements. [ABSTRACT FROM AUTHOR] |
Copyright of Molecules is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
قاعدة البيانات: | Complementary Index |
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