Novel fluorene-based copolymers containing branched 2-Methyl-butyl-substituted fluorene-co-benzothiadiazole units for remarkable optical gain enhancement in green-yellow emission range

Yu, Zhou and Guo, Xiangru and Zhang, Qi and Chi, Lang and Chen, Ting and Xia, Ruidong and Wu, Longfei and Lüer, Larry and Cabanillas González, Juan (2016). Novel fluorene-based copolymers containing branched 2-Methyl-butyl-substituted fluorene-co-benzothiadiazole units for remarkable optical gain enhancement in green-yellow emission range. "Journal of Physical Chemistry C", v. 120 ; pp. 11350-11358. ISSN 1932-7447. https://doi.org/10.1021/acs.jpcc.6b01375.

Description

Title: Novel fluorene-based copolymers containing branched 2-Methyl-butyl-substituted fluorene-co-benzothiadiazole units for remarkable optical gain enhancement in green-yellow emission range
Author/s:
  • Yu, Zhou
  • Guo, Xiangru
  • Zhang, Qi
  • Chi, Lang
  • Chen, Ting
  • Xia, Ruidong
  • Wu, Longfei
  • Lüer, Larry
  • Cabanillas González, Juan
Item Type: Article
Título de Revista/Publicación: Journal of Physical Chemistry C
Date: May 2016
ISSN: 1932-7447
Volume: 120
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We develop novel fluorene-based green-yellow emission copolymers (namely, nF1/4F8BT) composed of poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) and branched 2-methylbutyl substituted fluorene-co-benzothiadiazole units (F1/4BT) in different ratios. Upon blending nF1/4F8BT copolymers with poly(9,9-dioctylfluorene) (PFO), a systematic increase in photoluminescence quantum efficiency is observed as the ratio of the branched monomers increase. Likewise, nF1/4F8BT and PFO:nF1/4F8BT blends exhibit superior optical gain properties with respect to F8BT, manifested as a 30% reduction of amplified spontaneous emission threshold and 50% increase in optical gain with respect to F8BT blends at the same emission wavelength. The optical-gain-related properties were studied to understand the influence of the branched side chain unit on stimulated emission properties. Femtosecond transient absorption studies confirm exciton-annihilation hindrance in the new copolymers likely caused by interference of branched substituents with molecular packing in films. Branch side-chain substitution of a limited number of monomers is an efficient strategy to boost the optical gain properties of conjugated polymers.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT2014-57652-C2-1-RUnspecifiedIMDEASensores químicos basados en láseres de polímero conjugado dopados con colorante
Government of SpainPCIN-2015-169-C02-01UnspecifiedIMDEAUnspecified
Madrid Regional GovernmentS2013/MIT-3007MAD2DJosé Manue Udías MoineloPropiedades fundamentales y aplicaciones del grafeno y otros materiales bidimensionales

More information

Item ID: 48772
DC Identifier: http://oa.upm.es/48772/
OAI Identifier: oai:oa.upm.es:48772
DOI: 10.1021/acs.jpcc.6b01375
Official URL: https://pubs.acs.org/doi/10.1021/acs.jpcc.6b01375
Deposited by: Memoria Investigacion
Deposited on: 06 Feb 2018 17:28
Last Modified: 06 Feb 2018 17:28
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