Synthesis, photophysics, and electroluminescence of high-efficiency saturated red light-emitting polyfluorene-based polyelectrolytes and their neutral precursors
作者:Fei Huang、Lintao Hou、Huilin Shen、Jiaxing Jiang、Feng Wang、Hongyu Zhen、Yong Cao
DOI:10.1039/b503920g
日期:——
High-efficiency saturated red light-emitting polyelectrolytes and their neutral precursors: aminoalkyl-substituted polyfluorenes (PFN) with different 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DBT) contents were synthesized by Suzuki coupling reaction. Their quaternized ammonium polyelectrolyte derivatives were obtained through a post-polycondensation treatment on the terminal amino groups. The resulting copolymers are soluble in polar solvents. Narrow band-gap (NBG) DBT units incorporated into the polymer backbone act as exciton traps. As a result, all the polymers emit red light specific to the DBT segments under UV excitation in the solid state. It was found out that the PFN–DBT copolymers show good device performance when high work-function metals, such as Al, are used as the electron-injection cathode replacing conventional low work-function cathodes such as Ca and Ba. It has been shown that these polymers also can be used as electron injection layers (ETL) in double layer structures in polymer light-emitting diodes (PLEDs). Double layer devices, with PFN–DBT as an electron injection layer on top of conventional RGB light-emitting polymers, with high work-function metal cathodes emit light exclusively from the RGB polymers and show high external quantum efficiency.
通过铃木偶联反应合成了高效饱和红色发光聚电解质及其中性前体:具有不同 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DBT) 含量的氨基烷基取代聚芴 (PFN)。通过对末端氨基进行缩聚后处理,得到了它们的季铵化聚电解质衍生物。所得共聚物可溶于极性溶剂。聚合物骨架中的窄带隙(NBG)DBT 单元可作为激子陷阱。因此,在固态紫外线激发下,所有聚合物都会发出 DBT 段特有的红光。研究发现,当使用 Al 等高功函数金属取代 Ca 和 Ba 等传统低功函数阴极作为电子注入阴极时,PFN-DBT 共聚物显示出良好的器件性能。研究表明,这些聚合物还可用作聚合物发光二极管(PLED)双层结构中的电子注入层(ETL)。在传统的 RGB 发光聚合物上使用 PFN-DBT 作为电子注入层的双层装置,其高功函数金属阴极只从 RGB 聚合物发光,并显示出很高的外部量子效率。
An Electron Transport Layer Material and the Application Thereof
申请人:South China University of Technology
公开号:US20180033985A1
公开(公告)日:2018-02-01
The present invention belongs to the technical field of optoelectronic devices, and discloses an electron transport layer material and its application. This material has the following structure:
wherein n is a natural number of 1 to 10000, B is a strongly polar group, A1 and A2 are the same or different aromatic ring derivatives or conjugated units containing carbon-carbon double bonds and carbon-nitrogen bonds, M is a connection unit between A2 and B and is an alkyl group containing 1 to 20 carbon atoms, or is an alkyl group in which one or more carbon atoms are replaced by one or more functional groups selected from oxygen atoms, alkenyl groups, alkynyl groups, aryl groups or ester groups, and the hydrogen atom is replaced by a fluorine atom, a chlorine atom, a bromine atom, an iodine atom or the above-mentioned functional groups.
High-Efficiency, Environment-Friendly Electroluminescent Polymers with Stable High Work Function Metal as a Cathode: Green- and Yellow-Emitting Conjugated Polyfluorene Polyelectrolytes and Their Neutral Precursors
作者:Fei Huang、Lintao Hou、Hongbin Wu、Xiaohui Wang、Huilin Shen、Wei Cao、Wei Yang、Yong Cao
DOI:10.1021/ja0476765
日期:2004.8.1
A series of aminoalkyl-substituted polyfluorene copolymers with benzothiadiazole (BTDZ) of different content were synthesized by Suzuki coupling reaction, and their quaternized ammonium polyelectrolyte derivatives were obtained through a postpolymerization treatment on the terminal amino groups. Copolymers are soluble in environmentally friendlier solvents, such as alcohols. It was found that the efficient energy transfer occurs by exciton trapping on the narrow band gap BTDZ site under UV illumination. Only 1% of BTDZ content is needed to completely quench a fluorene emission for both the neutral and the quaternized copolymers in the neat film. Absolute PL efficiencies of copolymer films were greatly enhanced as a result of the suppression of excimer formation. Light-emitting devices fabricated from these copolymers show high external quantum efficiencies over 3% and 1% for the neutral precursor and the quaternized copolymers, respectively, with high work function metals such as Al as a cathode. To the best of our knowledge, this is the first report on an electroluminescent polymer which bears the high EL efficiency, the electron-injection ability from high work function metals, and the solubility in environment-friendly solvents at the same time. These features make them a promising candidate for the next generation of light-emitting copolymers in PLED flat panel display application.
Fluorescent sensor based on a novel conjugated polyfluorene derivative
A novel water-soluble polyfluorene derivative, poly[(9,9-bis(3'-((N,N-dimethylamino)N-ethylammonium) propyl)-2,7-fluorene)-alt-2,7-(9,9-p-divinylbenzene)]dibromide (P-2) was synthesized by the palladium-catalyzed Suzuki coupling reaction and it's quaternized ammonium polyelectrolyte derivatives was obtained through a postpolymerization treatment on the terminal amino groups. The electrochemical and optical properties of the copolymers was fully investigated. The results showed that the new polyfluorene derivative had high electronic conductivity and strong fluorescence, therefore it had good potential to be used in chemical and biological sensors, as shown in optical sensing of bovine albumin (BSA) in this study. (C) 2012 Elsevier B.V. All rights reserved.