The Experts below are selected from a list of 654 Experts worldwide ranked by ideXlab platform
Doo Kyung Moon - One of the best experts on this subject based on the ideXlab platform.
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white polymer light emitting diode materials introducing dendritic Quinoxaline Derivative synthesis optical and electroluminescent properties
Synthetic Metals, 2014Co-Authors: Gyo Jic Shin, Ho Jun Song, Kyung Ho Choi, Sangkug Lee, Doo Kyung MoonAbstract:Copolymers including dendritic-Quinoxaline (DTQ1G, DTQ2G) (<0.1 mol%) as dopant Derivative have been synthesized on a polyfluorene (PF) backbone based on the Suzuki coupling reaction. The UV–vis spectra of polymers showed similar behaviors in the solution and on the film. However, PL spectra were similar to that of PF in solution, but the peak around 590 nm increased as the amounts of DTQ1G and DTQ2G were increased in the casting film. In thin film, the intensities of the dendritic TQ monomers increased with the generation number of the dendrons. In case of PFDTQ2G03, the luminous efficiency and power efficiency were 0.66 cd/A and 0.29 lm/W, respectively with a maximum brightness of 3792 cd/m2. The CIE coordinates of PFDTQ1G05 and PFDTQ2G10 were (0.33, 0.30) and (0.35, 0.34) close to the pure white coordinates of (0.33, 0.33).
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conjugated polymers consisting of quinacridone and Quinoxaline as donor materials for organic photovoltaics orientation and charge transfer properties of polymers formed by phenyl structures with a Quinoxaline Derivative
Journal of Materials Chemistry, 2013Co-Authors: Ho Jun Song, Doohun Kim, Euijin Lee, Doo Kyung MoonAbstract:In this study, a highly soluble poly[quinacridone-alt-Quinoxaline] series (PQCQx, PQCTQx, PQCTPz) was synthesized through the Suzuki coupling reaction by introducing planar quinacridone and highly soluble Quinoxaline. The polymers were soluble in general organic solvents, and the Mn was 15.6–85.0 kg mol−1. The optical band gap energy was 1.82–1.97 eV, which was similar to the band gap of a benzothiadiazole Derivative. The HOMO and LUMO levels of the polymers were −5.32 to −5.46 eV and −3.40 to 3.50 eV, respectively. According to XRD measurements, the PQCQx and PQCTPz showed the formation of an ordered lamellar structure and conventional edge-on π-stacking, while the PQCTQx showed face-on formation relative to the substrate. This study also evaluated the OPV characteristics by fabricating a bulk-heterojunction-type polymer solar cell. For the device structure of ITO/PEDOT:PSS/active layer (PQCTQx:PC71BM = 1 : 2 with DIO)/PFN/Al, the values of open-circuit voltage (VOC), short-circuit current (JSC), fill factor (FF) and power conversion efficiency (PCE) were 0.85 V, 7.6 mA cm−2, 54.9%, and 3.6%, respectively.
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synthesis of random copolymers based on 3 hexylthiophene and Quinoxaline Derivative influence between the intramolecular charge transfer ict effect and π conjugation length for their photovoltaic properties
Synthetic Metals, 2011Co-Authors: Jang Yong Lee, Min Hee Choi, Soo Won Heo, Doo Kyung MoonAbstract:Abstract A series of low band gap, donor–acceptor polymers composed of regioregular 3-hexylthiophene segments and Quinoxaline Derivative units were synthesized by Stille coupling polymerization. The polymers had relatively low optical band gaps ranging from 1.61 to 1.83 eV. A bulk-heterojunction structure of glass/indium–tin oxide (ITO)/PEDOT:PSS/polymer-PCBM (1:3)/BaF 2 /Ba/Al was fabricated to examine the photovoltaic properties. 1-(3-Methoxycarbonyl)propyl-1-phenyl-[6,6]-C-71 (PC 71 BM) was used as the acceptor material owing to its increased absorption property in the visible region compared to 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-C-61 (PC 61 BM). Among these polymers, P1 showed the best device performance with a PCE of 0.88%. These results provided an effective strategy for the design and synthesis of low band gap conjugated polymers with a broad range of absorption.
Ruomeng Duan - One of the best experts on this subject based on the ideXlab platform.
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Application of Two-Dimensional Conjugated Benzo[1,2-b:4,5- b′]dithiophene in Quinoxaline-Based Photovoltaic Polymers
2016Co-Authors: Ruomeng Duan, Xia Guo, Ye Huang, Peng Wang, Shaoqing Zhang, Jianping Zhang, Lijun Huo, Jianhui HouAbstract:ABSTRACT: Two new donor−acceptor (D−A) alternative copolymers, PBDTDTQx-T and PBDTDTQx-O, were de-signed and synthesized to investigate the influence of two-dimensional conjugated structure on photovoltaic properties of conjugated polymers. In these two polymers, PBDTDTQx-O was used as control material, which is an alternative copolymer based on a Quinoxaline Derivative (DTQx) and alkoxy-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT-O) unit; PBDTDTQx-T has an identical conjugated backbone as PBDTDTQx-O, but a simple two-dimensional conjugated BDT unit (BDT-T) was used to replace the alkoxy-BDT. The polymers were characterized by TGA, UV−vis absorption, electrochemical cyclic voltammetry, hole mobility of space-charge-limited current (SCLC) model, and photovoltaic measurements. It was found that PBDTDTQx-T exhibits similar molecular energy levels and higher hole mobility than PBDTDTQx-O. The power conversion efficiency (PCE) of the polyme
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application of two dimensional conjugated benzo 1 2 b 4 5 b dithiophene in Quinoxaline based photovoltaic polymers
Macromolecules, 2012Co-Authors: Ruomeng Duan, Xia Guo, Ye Huang, Peng Wang, Shaoqing Zhang, Jianping Zhang, Lijun Huo, Jianhui HouAbstract:Two new donor–acceptor (D–A) alternative copolymers, PBDTDTQx-T and PBDTDTQx-O, were designed and synthesized to investigate the influence of two-dimensional conjugated structure on photovoltaic properties of conjugated polymers. In these two polymers, PBDTDTQx-O was used as control material, which is an alternative copolymer based on a Quinoxaline Derivative (DTQx) and alkoxy-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT-O) unit; PBDTDTQx-T has an identical conjugated backbone as PBDTDTQx-O, but a simple two-dimensional conjugated BDT unit (BDT-T) was used to replace the alkoxy-BDT. The polymers were characterized by TGA, UV–vis absorption, electrochemical cyclic voltammetry, hole mobility of space-charge-limited current (SCLC) model, and photovoltaic measurements. It was found that PBDTDTQx-T exhibits similar molecular energy levels and higher hole mobility than PBDTDTQx-O. The power conversion efficiency (PCE) of the polymer solar cells (PSCs) based on PBDTDTQx-T: [6,6]-phenyl-C-71-butyric acid methy...
Wei Wei - One of the best experts on this subject based on the ideXlab platform.
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An alternating polymer with fluorinated Quinoxaline and 2,7-carbazole segments for photovoltaic devices
RSC ADVANCES, 2017Co-Authors: Wu Haimei, Zhao Baofeng, Liu Hongli, Gao Chao, Qi Xin, Zhao Yifan, Xuan Liyang, Wei WeiAbstract:A novel alternating polymer, poly{[N-9'-heptadecyl-2,7-carbazole]-alt-5,5-[5',8'-di-2-thienyl-(60-fluoro2',3'- bis-(3 ''-octyloxyphenyl)-Quinoxaline)]} (PCzFTQx), based on mono-fluorinated Quinoxaline Derivative and 2,7-carbazole was synthesized and applied as electron donor material in polymer solar cells. Compared to the corresponding counterpart polymer without fluorine substituent (PCzTQx), PCzFTQx possesses similar absorption properties and optical bandgap (similar to 2.0 eV). However, the highest occupied molecular orbital (HOMO) energy level of PCzFTQx was lowered to similar to 5.31 eV, about 0.09 eV deeper than that of PCzTQx. Benefit from the low-lying HOMO energy level caused by the strong electron deficient fluorine atom on the Quinoxaline unit, the optimized photovoltaic device based on PCzFTQx and phenyl-C-71-butyric acid methyl ester (PC71BM) exhibited an enhanced power conversion efficiency (PCE) of 5.19% with corresponding high open-circuit voltage (Voc) of 0.94 V, relatively to those of 4.72% and 0.82 V for PCzTQx-based device. The experimental data indicated that fluorinated Quinoxaline based polymer PCzFTQx should be a promising donor for polymer solar cells.National Natural Science Foundation of China [11574013, 11527901]; National Fund for Fostering Talents of Basic Science (NFFTBS) [J1030310, J1103205]SCI(E)ARTICLE2616041-16048
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a copolymer based on benzo 1 2 b 4 5 b dithiophene and Quinoxaline Derivative for photovoltaic application
Reactive & Functional Polymers, 2012Co-Authors: Zhiyuan Cong, Hongli Liu, Di Tian, Bowen Gao, Chao Gao, Lixin Xiao, Zhijian Chen, Huanhuan Liu, Qihuang Gong, Wei WeiAbstract:Abstract A D–A–D copolymer (PBDTQx) with a bandgap of 1.78 eV, containing alkoxy-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) as donor and Quinoxaline Derivative (Qx) as acceptor, was synthesized by Stille coupling reaction. In order to study the photovoltaic property of PBDTQx, polymer solar cells (PSCs) were fabricated with PBDTQx as the electron donor blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the electron acceptor. The power conversion efficiency (PCE) of PSC was 1.01% for an optimized PBDTQx: PC61BM ratio of 1:5, under the illumination of AM 1.5, 100 mW/cm2. The results indicated that PBDTQx was a promising donor candidate in the application of polymer solar cells.
Jianhui Hou - One of the best experts on this subject based on the ideXlab platform.
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Application of Two-Dimensional Conjugated Benzo[1,2-b:4,5- b′]dithiophene in Quinoxaline-Based Photovoltaic Polymers
2016Co-Authors: Ruomeng Duan, Xia Guo, Ye Huang, Peng Wang, Shaoqing Zhang, Jianping Zhang, Lijun Huo, Jianhui HouAbstract:ABSTRACT: Two new donor−acceptor (D−A) alternative copolymers, PBDTDTQx-T and PBDTDTQx-O, were de-signed and synthesized to investigate the influence of two-dimensional conjugated structure on photovoltaic properties of conjugated polymers. In these two polymers, PBDTDTQx-O was used as control material, which is an alternative copolymer based on a Quinoxaline Derivative (DTQx) and alkoxy-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT-O) unit; PBDTDTQx-T has an identical conjugated backbone as PBDTDTQx-O, but a simple two-dimensional conjugated BDT unit (BDT-T) was used to replace the alkoxy-BDT. The polymers were characterized by TGA, UV−vis absorption, electrochemical cyclic voltammetry, hole mobility of space-charge-limited current (SCLC) model, and photovoltaic measurements. It was found that PBDTDTQx-T exhibits similar molecular energy levels and higher hole mobility than PBDTDTQx-O. The power conversion efficiency (PCE) of the polyme
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application of two dimensional conjugated benzo 1 2 b 4 5 b dithiophene in Quinoxaline based photovoltaic polymers
Macromolecules, 2012Co-Authors: Ruomeng Duan, Xia Guo, Ye Huang, Peng Wang, Shaoqing Zhang, Jianping Zhang, Lijun Huo, Jianhui HouAbstract:Two new donor–acceptor (D–A) alternative copolymers, PBDTDTQx-T and PBDTDTQx-O, were designed and synthesized to investigate the influence of two-dimensional conjugated structure on photovoltaic properties of conjugated polymers. In these two polymers, PBDTDTQx-O was used as control material, which is an alternative copolymer based on a Quinoxaline Derivative (DTQx) and alkoxy-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT-O) unit; PBDTDTQx-T has an identical conjugated backbone as PBDTDTQx-O, but a simple two-dimensional conjugated BDT unit (BDT-T) was used to replace the alkoxy-BDT. The polymers were characterized by TGA, UV–vis absorption, electrochemical cyclic voltammetry, hole mobility of space-charge-limited current (SCLC) model, and photovoltaic measurements. It was found that PBDTDTQx-T exhibits similar molecular energy levels and higher hole mobility than PBDTDTQx-O. The power conversion efficiency (PCE) of the polymer solar cells (PSCs) based on PBDTDTQx-T: [6,6]-phenyl-C-71-butyric acid methy...
Ho Jun Song - One of the best experts on this subject based on the ideXlab platform.
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white polymer light emitting diode materials introducing dendritic Quinoxaline Derivative synthesis optical and electroluminescent properties
Synthetic Metals, 2014Co-Authors: Gyo Jic Shin, Ho Jun Song, Kyung Ho Choi, Sangkug Lee, Doo Kyung MoonAbstract:Copolymers including dendritic-Quinoxaline (DTQ1G, DTQ2G) (<0.1 mol%) as dopant Derivative have been synthesized on a polyfluorene (PF) backbone based on the Suzuki coupling reaction. The UV–vis spectra of polymers showed similar behaviors in the solution and on the film. However, PL spectra were similar to that of PF in solution, but the peak around 590 nm increased as the amounts of DTQ1G and DTQ2G were increased in the casting film. In thin film, the intensities of the dendritic TQ monomers increased with the generation number of the dendrons. In case of PFDTQ2G03, the luminous efficiency and power efficiency were 0.66 cd/A and 0.29 lm/W, respectively with a maximum brightness of 3792 cd/m2. The CIE coordinates of PFDTQ1G05 and PFDTQ2G10 were (0.33, 0.30) and (0.35, 0.34) close to the pure white coordinates of (0.33, 0.33).
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conjugated polymers consisting of quinacridone and Quinoxaline as donor materials for organic photovoltaics orientation and charge transfer properties of polymers formed by phenyl structures with a Quinoxaline Derivative
Journal of Materials Chemistry, 2013Co-Authors: Ho Jun Song, Doohun Kim, Euijin Lee, Doo Kyung MoonAbstract:In this study, a highly soluble poly[quinacridone-alt-Quinoxaline] series (PQCQx, PQCTQx, PQCTPz) was synthesized through the Suzuki coupling reaction by introducing planar quinacridone and highly soluble Quinoxaline. The polymers were soluble in general organic solvents, and the Mn was 15.6–85.0 kg mol−1. The optical band gap energy was 1.82–1.97 eV, which was similar to the band gap of a benzothiadiazole Derivative. The HOMO and LUMO levels of the polymers were −5.32 to −5.46 eV and −3.40 to 3.50 eV, respectively. According to XRD measurements, the PQCQx and PQCTPz showed the formation of an ordered lamellar structure and conventional edge-on π-stacking, while the PQCTQx showed face-on formation relative to the substrate. This study also evaluated the OPV characteristics by fabricating a bulk-heterojunction-type polymer solar cell. For the device structure of ITO/PEDOT:PSS/active layer (PQCTQx:PC71BM = 1 : 2 with DIO)/PFN/Al, the values of open-circuit voltage (VOC), short-circuit current (JSC), fill factor (FF) and power conversion efficiency (PCE) were 0.85 V, 7.6 mA cm−2, 54.9%, and 3.6%, respectively.
