Copolyfluorenes containing pendant bipolar carbazole and 1,2,4-triazole groups: Synthesis, characterization, and optoelectronic applications
作者:Chia-Shing Wu、Yun Chen
DOI:10.1002/pola.24831
日期:2011.9.15
Three novel copolyfluorenes (P1‐P3) containing pendant bipolar groups (2.5–7.7 mol %), directly linked hole‐transporting carbazole and electron‐transporting aromatic 1,2,4‐triazole, were synthesized by the Suzuki coupling reaction and applied to enhance emission efficiency of polymer light‐emitting diodes based on conventional MEH‐PPV. The bipolar groups not only suppress undesirable green emission
通过Suzuki偶联反应合成了三种新型的含侧链双极性基团(2.5-7.7 mol%)的共聚芴(P1 - P3),直接连接的空穴传输咔唑和电子传输的芳香族1,2,4-三唑,并用于增强基于常规MEH-PPV的聚合物发光二极管的发射效率。双极性基团不仅抑制了热退火下聚芴的不良绿色发射,而且还促进了所得共聚芴的电子亲和力和空穴亲和力。将双极共聚芴与MEH-PPV共混可显着提高器件性能[ITO / PEDOT:PSS / MEH-PPV + P1,P2或P3/ Ca(50nm)/ Al(100nm)]。最大亮度和亮度效率从仅MEH‐PPV的设备的3230 cd / m 2和0.29 cd / A增强到15690 cd / m 2和0.81 cd / A(具有MEH‐PPV / P3的混合设备= 94/6分别含有约0.46 wt%的双极性侧基残基。我们的结果证明了双极共聚芴在提高MEH-PPV的发射效率方面的功效。©2011