White Polymer Light-Emitting Electrochemical Cells Fabricated Using Energy Donor and Acceptor Fluorescent π-Conjugated Polymers Based on Concepts of Band-Structure Engineering

Yoshinori Nishikitani, Daisuke Takizawa, Hiroyuki Nishide, Soichi Uchida, Suzushi Nishimura

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Abstract

The authors report on white polymer light-emitting electrochemical cells (PLECs) fabricated with a polymer blend film composed of a blue fluorescent π-conjugated polymer (blue FCP), poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD), and a red-orange FCP, poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), based on concepts of band-structure engineering. Polymer blending is one of the simplest and most promising methods for fabrication of van der Waals interfaces, which convert electricity to light in PLECs. By optimizing the composition of PFD, MEH-PPV, poly(ethylene oxide) (PEO), and salt (KCF3SO3) in the active layer, white-light emission with Commission Internationale de l'Eclairage (CIE) coordinates of (x = 0.33, y = 0.31) can be achieved through light mixing of blue exciton emission from PFD and red-orange exciton emission from MEH-PPV at an applied voltage higher than the threshold voltage, Vth blue-FCP, which corresponds to Eg blue-FCP/e, where Eg blue-FCP is the band gap of PFD and e is the elemental charge. The white light produced by light mixing of PFD and MEH-PPV emissions can be obtained at a low MEH-PPV concentration, while only red-orange emissions from MEH-PPV are obtained at high MEH-PPV concentrations. The emission color of FCP-blend PLECs can be explained by Förster resonance energy transfer (FRET) from the excited PFD to the MEH-PPV because the photoluminescence (PL) spectrum of PFD overlaps with the UV-vis absorption spectrum of MEH-PPV. However, FRET was limited by the presence of PEO in the active layers of the FCP-blend PLECs. This meant it was much easier to tune the emission colors compared to FCP-blend polymer light-emitting diodes (PLEDs), in which FRET occurs predominantly. Utilization of a polymer blend film of blue and red-orange FCPs in PLECs is a very effective and promising method for fabrication of white light-emitting devices.

Original languageEnglish
Pages (from-to)28701-28710
Number of pages10
JournalJournal of Physical Chemistry C
Volume119
Issue number52
DOIs
Publication statusPublished - 2015 Dec 31

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Electrochemical cells
electrochemical cells
Conjugated polymers
Band structure
Polymers
engineering
polymer blends
polymers
Polymer blends
Polyethylene oxides
energy
Energy transfer
energy transfer
Excitons
excitons
Color
color
poly(2-methoxy-5-(2'-ethylhexyloxy)-p-phenylenevinylene)
Fabrication
fabrication

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

@article{3f6a9cd5d4234f3e8d19f39e57bf09af,
title = "White Polymer Light-Emitting Electrochemical Cells Fabricated Using Energy Donor and Acceptor Fluorescent π-Conjugated Polymers Based on Concepts of Band-Structure Engineering",
abstract = "The authors report on white polymer light-emitting electrochemical cells (PLECs) fabricated with a polymer blend film composed of a blue fluorescent π-conjugated polymer (blue FCP), poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD), and a red-orange FCP, poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), based on concepts of band-structure engineering. Polymer blending is one of the simplest and most promising methods for fabrication of van der Waals interfaces, which convert electricity to light in PLECs. By optimizing the composition of PFD, MEH-PPV, poly(ethylene oxide) (PEO), and salt (KCF3SO3) in the active layer, white-light emission with Commission Internationale de l'Eclairage (CIE) coordinates of (x = 0.33, y = 0.31) can be achieved through light mixing of blue exciton emission from PFD and red-orange exciton emission from MEH-PPV at an applied voltage higher than the threshold voltage, Vth blue-FCP, which corresponds to Eg blue-FCP/e, where Eg blue-FCP is the band gap of PFD and e is the elemental charge. The white light produced by light mixing of PFD and MEH-PPV emissions can be obtained at a low MEH-PPV concentration, while only red-orange emissions from MEH-PPV are obtained at high MEH-PPV concentrations. The emission color of FCP-blend PLECs can be explained by F{\"o}rster resonance energy transfer (FRET) from the excited PFD to the MEH-PPV because the photoluminescence (PL) spectrum of PFD overlaps with the UV-vis absorption spectrum of MEH-PPV. However, FRET was limited by the presence of PEO in the active layers of the FCP-blend PLECs. This meant it was much easier to tune the emission colors compared to FCP-blend polymer light-emitting diodes (PLEDs), in which FRET occurs predominantly. Utilization of a polymer blend film of blue and red-orange FCPs in PLECs is a very effective and promising method for fabrication of white light-emitting devices.",
author = "Yoshinori Nishikitani and Daisuke Takizawa and Hiroyuki Nishide and Soichi Uchida and Suzushi Nishimura",
year = "2015",
month = "12",
day = "31",
doi = "10.1021/acs.jpcc.5b08547",
language = "English",
volume = "119",
pages = "28701--28710",
journal = "Journal of Physical Chemistry C",
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publisher = "American Chemical Society",
number = "52",

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T1 - White Polymer Light-Emitting Electrochemical Cells Fabricated Using Energy Donor and Acceptor Fluorescent π-Conjugated Polymers Based on Concepts of Band-Structure Engineering

AU - Nishikitani, Yoshinori

AU - Takizawa, Daisuke

AU - Nishide, Hiroyuki

AU - Uchida, Soichi

AU - Nishimura, Suzushi

PY - 2015/12/31

Y1 - 2015/12/31

N2 - The authors report on white polymer light-emitting electrochemical cells (PLECs) fabricated with a polymer blend film composed of a blue fluorescent π-conjugated polymer (blue FCP), poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD), and a red-orange FCP, poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), based on concepts of band-structure engineering. Polymer blending is one of the simplest and most promising methods for fabrication of van der Waals interfaces, which convert electricity to light in PLECs. By optimizing the composition of PFD, MEH-PPV, poly(ethylene oxide) (PEO), and salt (KCF3SO3) in the active layer, white-light emission with Commission Internationale de l'Eclairage (CIE) coordinates of (x = 0.33, y = 0.31) can be achieved through light mixing of blue exciton emission from PFD and red-orange exciton emission from MEH-PPV at an applied voltage higher than the threshold voltage, Vth blue-FCP, which corresponds to Eg blue-FCP/e, where Eg blue-FCP is the band gap of PFD and e is the elemental charge. The white light produced by light mixing of PFD and MEH-PPV emissions can be obtained at a low MEH-PPV concentration, while only red-orange emissions from MEH-PPV are obtained at high MEH-PPV concentrations. The emission color of FCP-blend PLECs can be explained by Förster resonance energy transfer (FRET) from the excited PFD to the MEH-PPV because the photoluminescence (PL) spectrum of PFD overlaps with the UV-vis absorption spectrum of MEH-PPV. However, FRET was limited by the presence of PEO in the active layers of the FCP-blend PLECs. This meant it was much easier to tune the emission colors compared to FCP-blend polymer light-emitting diodes (PLEDs), in which FRET occurs predominantly. Utilization of a polymer blend film of blue and red-orange FCPs in PLECs is a very effective and promising method for fabrication of white light-emitting devices.

AB - The authors report on white polymer light-emitting electrochemical cells (PLECs) fabricated with a polymer blend film composed of a blue fluorescent π-conjugated polymer (blue FCP), poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD), and a red-orange FCP, poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), based on concepts of band-structure engineering. Polymer blending is one of the simplest and most promising methods for fabrication of van der Waals interfaces, which convert electricity to light in PLECs. By optimizing the composition of PFD, MEH-PPV, poly(ethylene oxide) (PEO), and salt (KCF3SO3) in the active layer, white-light emission with Commission Internationale de l'Eclairage (CIE) coordinates of (x = 0.33, y = 0.31) can be achieved through light mixing of blue exciton emission from PFD and red-orange exciton emission from MEH-PPV at an applied voltage higher than the threshold voltage, Vth blue-FCP, which corresponds to Eg blue-FCP/e, where Eg blue-FCP is the band gap of PFD and e is the elemental charge. The white light produced by light mixing of PFD and MEH-PPV emissions can be obtained at a low MEH-PPV concentration, while only red-orange emissions from MEH-PPV are obtained at high MEH-PPV concentrations. The emission color of FCP-blend PLECs can be explained by Förster resonance energy transfer (FRET) from the excited PFD to the MEH-PPV because the photoluminescence (PL) spectrum of PFD overlaps with the UV-vis absorption spectrum of MEH-PPV. However, FRET was limited by the presence of PEO in the active layers of the FCP-blend PLECs. This meant it was much easier to tune the emission colors compared to FCP-blend polymer light-emitting diodes (PLEDs), in which FRET occurs predominantly. Utilization of a polymer blend film of blue and red-orange FCPs in PLECs is a very effective and promising method for fabrication of white light-emitting devices.

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