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Journal of Materials Science: Materials in Electronics

, Volume 28, Issue 23, pp 17750–17760 | Cite as

Analysis and control of energy transfer processes and luminescence across the visible spectrum in PFO:P3OT blends

  • Wesley Renzi
  • Flavio FranchelloEmail author
  • Neusmar J. A. Cordeiro
  • Vitor B. Pelegati
  • Carlos L. César
  • Edson Laureto
  • José L. Duarte
Article

Abstract

A systematic study of luminescence from blends made of poly (9, 9-dioctylfluorene-2, 7-diyl) (PFO) and poly (3-octylthiophene-2, 5-diyl) (P3OT), and its photophysics was carried out. Acceptor concentration influence and sample preparation conditions was analyzed, particularly regarding the solvent, in order to control emission through the entire visible spectrum, and to understand the physical processes involved. An additional emission band observed in PFO:P3OT films with low concentration of P3OT was studied through confocal luminescence microscopy and was attributed to a decrease of energy transfer between P3OT molecules leading to an emission through chains with smaller conjugation length. The extra emission was also separated from the others by Time Resolved Emission Spectroscopy due to the fact that its lifetime is longer than those of the other emissions. Balance control of the emission through PFO (blue), low conjugation chains of P3OT (green) and P3OT aggregates (red) was possible changing the solvent and the way to prepare samples, that causes a greater or lesser amount of β phase in PFO. The study of the energy processes involved was also performed.

Notes

Acknowledgements

This work was supported by Brazilian agencies such as: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná (Fundação Araucária), and Instituto Nacional de Ciência e Tecnologia em Eletrônica Orgânica (INEO). The authors gratefully acknowledge Dr. Teresa D. Z. Atvars and Dr. Fernando J. Quites for their helpful discussions concerning this work, as well as ESPEC Laboratory-Central Multiusuário-PROPPG-UEL.

Supplementary material

10854_2017_7714_MOESM1_ESM.docx (853 kb)
Supplementary material 1 (DOCX 852 KB)

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Departament of PhysicsUniversidade Estadual de LondrinaLondrinaBrazil
  2. 2.Institute of Physics Gleb WataghinUniversidade Estadual de CampinasCampinasBrazil

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