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Polyfluorene based blends for white light emission

机译：聚芴基共混物，可发出白光

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摘要

Single layer white light emitting diodes were constructed with blends containing as blue emitter and matrix host poly(9,9-dihexyl-2,7-fluorene) (LaPPSlO), and the green and red emitters pory[(9,9-dihexyl-9H-fluorene-2,7-diyl)-l,2-ethenediyl-l,4-phenylene-1,2-ethenediyl] (LaPPS16) and poly[2-methoxy-5-(2-ethylhexoxy)-l,4-phenylene vinyl-ene] (MEH-PPV), respectively, as guests components. Two blends were studied: LaPPS10:LaPPS16:MEH-PPV = 100:0.01:0.20 (w/w) (JF14) and another with the same components and a second blue emitter: a copolymer of poly(methyl methacrylate-co-methyl antracenyl methacrylate), P(MMA-co-MMAnt), with the composition LaPPS10:P(MMA-co-MMAnt):LaPPS16:MEH-PPV= 100:40:0.01:0.20 (w/w) (JF17). The PL spectra of JF14 and JF17 in the higher energy edge are characteristic of the matrix (LaPPS 10). The morphological characterization showed the formation of a biphasic structure with a matrix of LaPPSlO and segregated domains of MEH-PPV in the case of JF14 and of P(MMA-co-MMAnt) in the case of JF17. Significant differences between EL and PL spectra were observed for the blends indicating that the mechanism for the excited states or quenching processes are very different in both cases. In addition, the EL emissions suggested that the cascade mechanism for the charge migration or charge recombination or energy transfer processes are also incomplete allowing more than one type of emission. EL spectra were red-shifted in relation to PL, which was partly attributed to the trapping of energy carriers that may occur in EL, apart from energy transfer. The CIE coordinates for EL emission of JF14 blend the coordinates are (0.30, 0.32) and for JF17 blend are (0.29, 0.38) corresponding to white light emission. Spectroscopic data brought evidence of the formation of the p phase in the polyfluorene matrix, and due to differences in band gap, it was concluded that hole carriers tend to be injected into that phase rather than into the disordered one, leading to the proposal that EL emission was predominantly originated from the p phase.
机译：单层白色发光二极管由掺有以下成分的混合物构成：蓝色发射体和基质主体聚（9,9-二己基-2,7-芴）（LaPPS10），绿色和红色发射体pory [（9,9-dihexyl- 9H-芴-2,7-二基）-1,2-乙二烯基-1,4-亚苯基-1,2-乙二烯基]（LaPPS16）和聚[2-甲氧基-5-（2-乙基己氧基）-1,4 -亚苯基乙烯基]（MEH-PPV）分别作为客体组分。研究了两种共混物：LaPPS10：LaPPS16：MEH-PPV = 100：0.01：0.20（w / w）（JF14），另一种具有相同的成分和第二种蓝色发射体：聚（甲基丙烯酸甲酯-共-甲基蒽基）共聚物甲基丙烯酸酯），P（MMA-共-MMAnt），组成为LaPPS10：P（MMA-共-MMAnt）：LaPPS16：MEH-PPV = 100：40：0.01：0.20（w / w）（JF17）。高能量边缘的JF14和JF17的PL光谱是矩阵（LaPPS 10）的特征。形态学特征显示在JF14的情况下形成具有LaPPS10的基质和MEH-PPV的分离域的分离的两相结构，在JF17的情况下则形成P（MMA-co-MMAnt）的分离的结构域。对于共混物，观察到EL和PL光谱之间的显着差异，表明在两种情况下，激发态或淬灭过程的机理都非常不同。此外，EL发射表明电荷迁移，电荷重组或能量转移过程的级联机制也不完整，从而导致不止一种类型的发射。 EL光谱相对于PL发生了红移，这部分归因于除能量转移之外，EL中可能出现的载流子的捕获。 JF14混合物的EL发射的CIE坐标对应于白光发射，坐标为（0.30，0.32），而JF17混合物的坐标为（0.29，0.38）。光谱数据提供了在聚芴基体中形成p相的证据，并且由于带隙的差异，得出的结论是空穴载流子倾向于注入到该相中，而不是注入到无序的相中。发射主要来自p相。

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  • 来源
    《Organic Electronics》 |2011年第9期|p.1493-1504|共12页
  • 作者

    Jeferson Ferreira de Deus; Gregorio C. Faria; Eduardo T. Iamazaki; Roberto M. Faria; Teresa D.Z. Atvars; Leni Akcelrud;

  • 作者单位

    Programa de P6s-graduacao em Engenharia de Material's e Processos - PIPE, Universidade Federal do Parana, Curitiba, PR, Brazil,Universidade Tecnologica Federal do Parana, Curitiba, PR, Brazil;

    Instituto de Fiska de Sao Carlos, Sao Carlos, SP, Brazil;

    Universidade Tecnologica Federal do Parana, Curitiba, PR, Brazil;

    Instituto de Fiska de Sao Carlos, Sao Carlos, SP, Brazil;

    Institute de Quimica, Universidade Estadual de Campinas, Campinas, SP, CEP 13084-971, Brazil;

    Laboratorio de Polimeros Paulo Scarpa - LaPPS, Departamento de Quimica, Universidade Federal do Parana, Caixa Postal 19081-990, CEP 81531-990,Curitiba, PR, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    photoluminescence; electroluminescence; polymer blends; white device emission;

    机译：光致发光;电致发光;聚合物共混物;白色器件发射;

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