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首页> 外文期刊>Journal of Applied Polymer Science >New Fluorene–Pyrazino[2,3-g]quinoxaline-Conjugated Copolymers: Synthesis, Optoelectronic Properties, and Electroluminescence Characteristics
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New Fluorene–Pyrazino[2,3-g]quinoxaline-Conjugated Copolymers: Synthesis, Optoelectronic Properties, and Electroluminescence Characteristics

机译：新型芴-吡嗪并[2,3-g]喹喔啉共轭共聚物：合成，光电性能和电致发光特性

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New donor–acceptor conjugated copolymers called poly}2,7-(9,90-dihexylfluorene)-co-5,10-[pyrazino (2,3-g)quinoxaline]{s or PFPQs [where F represents the 2,7- (9,90-dihexylfluorene) moiety and PQ represents the 5,10- (pyrazino[2,3-g]quinoxaline) moiety], synthesized by the palladium-catalyzed Suzuki coupling reaction, are reported. The PQ contents in the PFPQ copolymers were 0.3, 1, 5, and 50 mol %, and the resulting copolymers were named PFPQ0.3, PFPQ01, PFPQ05, and PFPQ50, respectively. Absorption spectra showed a progressive redshift as the PQ acceptor content increased. The relatively small optical band gap of 2.08 eV for PFPQ50 suggested strong intramolecular charge transfer (ICT) between the F and PQ moieties. The photoluminescence emission peaks of the PFPQ copolymer films also exhibited a large redshift with enhanced PQ contents, ranging from 551 nm for PFPQ0.3 to 592 nm for PFPQ50. However, the PFPQ copolymer based electroluminescence (EL) devices showed poor device performances probably due to the strong confinement of the electrons in the PQ moiety or significant ICT. This problem was resolved with a binary blend of poly[2,7-(9,9-dihexylfluorene)] (PF) and PFPQ with a volume ratio of 95/5 (BPQ05). Multiple emission peaks were observed at 421, 444, 480, 516, and 567 nm in the BPQ05-based EL devices because the low PQ content led to incomplete energy transfer. The Commission Internationale de L’Eclairage 1931 coordinates of the BPQ05-based EL device were (0.31, 0.32), which were very close to the standard white emission of (0.33, 0.33). Furthermore, the maximum luminescence intensity and luminescence yield were 524 cd/m2 and 0.33 cd/A, respectively. This study suggested that a pure white light emission was achieved with the PFPQ copolymers or PF/PFPQ blends through the control of the energy transfer between F and PQ. Such PFPQ copolymers or PF/PFPQ blends would be interesting for electronic and optoelectronic devices.
机译：新的供体-受体共轭共聚物，称为聚} 2,7-（9,90-二己基芴）-co-5,10- [吡嗪并（2,3-g）喹喔啉] {s或PFPQs [其中F代表2,7报道了通过钯催化的Suzuki偶联反应合成的-（9,90-二己基芴）部分和PQ代表5,10-（吡嗪并[2,3-g]喹喔啉）部分]。 PFPQ共聚物中的PQ含量为0.3、1、5和50mol％，并且所得共聚物分别命名为PFPQ0.3，PFPQ01，PFPQ05和PFPQ50。吸收光谱显示随着PQ受体含量的增加而进行性红移。 PFPQ50的光学带隙相对较小，为2.08 eV，表明F和PQ部分之间的分子内电荷转移（ICT）很强。 PFPQ共聚物薄膜的光致发光发射峰还显示出较大的红移，PQ含量增加，范围从PFPQ0.3的551 nm到PFPQ50的592 nm。但是，基于PFPQ共聚物的电致发光（EL）器件显示出较差的器件性能，这可能归因于PQ部分中电子的强烈限制或显着的ICT。使用聚[2,7-（9,9-二己基芴）]（PF）和PFPQ的体积比为95/5（BPQ05）的二元共混物可以解决此问题。在基于BPQ05的EL器件中，在421、444、480、516和567 nm处观察到多个发射峰，因为低的PQ含量导致能量传递不完全。基于BPQ05的EL设备的国际照明委员会1931年坐标为（0.31，0.32），非常接近标准白色发射（0.33，0.33）。此外，最大发光强度和发光产量分别为524cd / m 2和0.33cd / A。这项研究表明，通过控制F和PQ之间的能量转移，PFPQ共聚物或PF / PFPQ共混物可实现纯白光发射。这样的PFPQ共聚物或PF / PFPQ共混物对于电子和光电子器件将是令人感兴趣的。

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