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Achieving White Emission from Solution Processable Blends of Polyvinylene Derivative Guests into a Polyfluorene Matrix

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Abstract

In this work we have studied the emissions from luminescent polymeric blends, aiming to obtain a white emission. Two of the materials, a polyfluorene derivative matrix poly(9,9-dihexyl-2,7-fluorene) (LaPPS 10, labeled as L10) and a polyvinylene-derivative guest (poly[(9,9-dihexyl-9H-fluorene-2,7-diyl)-1,2-ethenediyl-1,4-phenylene-1,2-ethenediyl] (LaPPS 16—L16), have not been extensively studied. The L10 was used as a matrix (host) and the L16 as a dopant (guest). A commercial polyvinylene (MDMO-PPV) was also used as a dopant. In order to achieve the white emission, it is necessary to control the energy transfer among the components of the blend. The emissions of solutions were analyzed, varying the concentration of the materials. From that, solutions of polymeric blends of L10:L16 (at different ratios) were spincoated, forming solid state films. The emission of these binary blend films were monitored as a function of the guest concentration. Therefore, in order to cover the red region of the visible spectrum, MDMO-PPV was added to the initial blend, forming a ternary blend (L10:L16:MDMO-PPV). The emissions of these blend films were studied, varying the concentration of the MDMO-PPV. Using the optimal results for the material ratios of these ternary blends, aiming for the white emission, electroluminescent devices were produced and the electroluminescence was studied. A whitish emission was obtained with the 97.5:0.5:2.0 blend, leading to the CIE coordinates 0.31:0.36.

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Acknowledgments

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001, by the National Council for Scientific and Technological Development (CNPq), Fundação Araucária, and by the National Institute for Science and Technology on Organic Electronics (INEO). The authors gratefully acknowledge the Spectroscopy Laboratory (SPEC) at PROPPG-UEL Multiuser Center.

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Authors and Affiliations

  1. Departament of Physics, State University of Londrina, Celso Garcia Cid Road, PR 445 Km 380, Campus Universitário, Londrina, PR, 86.057-970, Brazil

    Flavio Franchello, Luana Cristina Wouk de Menezes, Wesley Renzi, Edson Laureto & José Leonil Duarte

  2. Departament of Physics, Federal University of Paraná, Curitiba, PR, Brazil

    Luana Cristina Wouk de Menezes

  3. Departament of Chemistry, Federal University of Paraná, Curitiba, PR, Brazil

    Denis Augusto Turchetti & Leni Campus Akcelrud

  4. Department of Physics, Technological Federal University of Paraná, Curitiba, PR, Brazil

    Jeferson Ferreira de Deus

  5. Federal Institute of Parana, Campus Pitanga, Pitanga, PR, Brazil

    Wesley Renzi

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  1. Flavio Franchello
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  2. Luana Cristina Wouk de Menezes
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  7. Jeferson Ferreira de Deus
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  8. José Leonil Duarte
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Correspondence to Flavio Franchello.

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Franchello, F., de Menezes, L.C.W., Renzi, W. et al. Achieving White Emission from Solution Processable Blends of Polyvinylene Derivative Guests into a Polyfluorene Matrix. J. Electron. Mater. 48, 5980–5987 (2019). https://doi.org/10.1007/s11664-019-07350-z

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  • DOI: https://doi.org/10.1007/s11664-019-07350-z

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