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Wu, Longfei and Luo, Feng and Lüer, Larry and Romero, Beatriz and Otón Sánchez, José Manuel and Zhang, Qi and Xia, Ruidong and Cabanillas González, Juan (2016). Quantifying the efficiency of Förster-assisted optical gain in semiconducting polymer blends by excitation wavelength selective amplified spontaneous emission. "Journal of Polymer Science Part B: Polymer Physics", v. 54 ; pp. 2311-2317. ISSN 0887-6266. https://doi.org/10.1002/polb.24141.
Title: | Quantifying the efficiency of Förster-assisted optical gain in semiconducting polymer blends by excitation wavelength selective amplified spontaneous emission |
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Author/s: |
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Item Type: | Article |
Título de Revista/Publicación: | Journal of Polymer Science Part B: Polymer Physics |
Date: | August 2016 |
ISSN: | 0887-6266 |
Volume: | 54 |
Subjects: | |
Freetext Keywords: | amplified spontaneous emission, conjugated polymer blends, laser spectroscopy, energy transfer, amorphous materials |
Faculty: | E.T.S.I. Telecomunicación (UPM) |
Department: | Otro |
Creative Commons Licenses: | Recognition - No derivative works - Non commercial |
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We study the correlation between Förster resonance energy transfer (FRET) and optical gain properties in conjugated polymer blends based on regioregular poly(3-hexylthiophene) (P3HT) and poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT). First, FRET dynamics are investigated with femtosecond transient absorption spectroscopy observing a sub-picosecond energy transfer from F8BT to P3HT (550 fs) at medium doping levels (40% wt P3HT in F8BT). Amplified spontaneous emission (ASE) is then characterized in blends upon exciting predominantly the host and guest polymers, respectively. The corresponding density of absorbed photons at threshold conditions is compared upon host or guest photoexcitation as a method to quantitatively determine the FRET-assisted ASE efficiencies. We observe a reduction in ASE efficiency upon host photoexcitation of 20%, in the best case, respect to guest photoexcitation. Our results confirm that even in strongly coupled host:guest mixtures delayed exciton population by energy transfer is subtle to losses ascribed to exciton-exciton annihilation.
Item ID: | 48706 |
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DC Identifier: | https://oa.upm.es/48706/ |
OAI Identifier: | oai:oa.upm.es:48706 |
DOI: | 10.1002/polb.24141 |
Official URL: | https://onlinelibrary.wiley.com/doi/abs/10.1002/po... |
Deposited by: | Memoria Investigacion |
Deposited on: | 20 Jan 2018 09:17 |
Last Modified: | 30 Nov 2022 09:00 |