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Designing simple non-fused terthiophene-based electron acceptors for efficient organic solar cells
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作者 Jiayu Li Kun Li +9 位作者 Zhe Mei Yu Chen Qian Xie Chenxu Yu Xuefeng Liu Yanqi Wang Yishi Wu Qing Liao Cunbin An Hongbing Fu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第9期501-508,共8页
Low-cost photovoltaic materials are essential for realizing large-scale commercial applications of organic solar cells(OSCs).However,highly efficient OSCs based on low-cost photovoltaic materials are scarce due to a d... Low-cost photovoltaic materials are essential for realizing large-scale commercial applications of organic solar cells(OSCs).However,highly efficient OSCs based on low-cost photovoltaic materials are scarce due to a deficiency in understanding the structure-property relationship.Herein,we investigated two low-cost terthiophene-based electron acceptors,namely,3TC8 and 3TEH,with 3,4-bis(octan-3-yloxy)thiophene,differing only in the alkylated thiophene-bridges.Both acceptors exhibit low optical gaps(∼1.43 eV)and possess deep highest occupied molecular orbital(HOMO)levels(∼−5.8 eV).Notably,the single-crystal structure of 3TEH demonstrates highly planar conjugated backbone and strongπ-πstacking between intermolecular terminal groups,attributed to the presence of the bulky alkylated noncovalently conformational locks.Upon utilizing both acceptors to fabricate OSCs,the 3TC8-based device exhibited a power conversion efficiency(PCE)of 11.1%,while the 3TEH-based OSC demonstrated an excellent PCE of 14.4%.This PCE is the highest among OSCs based on terthiophene-containing electron acceptors.These results offer a new strategy for designing low-cost electron acceptors for highly efficient OSCs. 展开更多
关键词 Organic solarcells Low cost TERTHIOPHENE Non-fused electron acceptor
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Pomelo biochar as an electron acceptor to modify graphitic carbon nitride for boosting visible-light-driven photocatalytic degradation of tetracycline 被引量:2
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作者 Feng Guo Chunli Shi +3 位作者 Wei Sun Yanan Liu Xue Lin Weilong Shi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第8期1-11,共11页
In this study,biochar(BC)derived from pomelo was prepared via a high-temperature calcination method to modify the graphitic carbon nitride(g-C_(3)N_(4))to synthesize the BC/g-C_(3)N_(4)composite for the degradation of... In this study,biochar(BC)derived from pomelo was prepared via a high-temperature calcination method to modify the graphitic carbon nitride(g-C_(3)N_(4))to synthesize the BC/g-C_(3)N_(4)composite for the degradation of the tetracycline(TC)antibiotic under visible light irradiation.The experimental results exhibit that the optimal feeding weight ratio of biochar/urea is 0.03:1 in BC/g-C_(3)N_(4)composite could show the best photocatalytic activity with the degradation rate of tetracycline is 83%in 100 min irradiation.The improvement of photocatalytic activity is mainly attributed to the following two points:(i)the strong bonding with π-π stacking between BC and g-C_(3)N_(4)make the photogenerated electrons of light-excited g-C_(3)N_(4)transfer to BC,quickly and improve the separation efficiency of carriers;(ii)the introduction of BC reduces the distance for photogenerated electrons to migrate to the surface and increases the specific surface area for providing more active sites.This study provides a sustainable,economical and promising method for the synthesis of photocatalytic materials their application to wastewater treatment. 展开更多
关键词 POMELO BIOCHAR Graphitic carbon nitride Photocatalytic degradation electron acceptor
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Effect of electron acceptors H_2O_2 and O_2 on the generated reactive oxygen species ~1O_2 and OH~· in TiO_2-catalyzed photocatalytic oxidation of glycerol 被引量:2
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作者 Trin Jedsukontorn Vissanu Meeyoo +1 位作者 Nagahiro Saito Mali Hunsom 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第11期1975-1981,共7页
The effect of the electron acceptors H2O2 and O2 on the type of generated reactive oxygen species(ROS),and glycerol conversion and product distribution in the TiO2-catalyzed photocatalytic oxidation of glycerol was ... The effect of the electron acceptors H2O2 and O2 on the type of generated reactive oxygen species(ROS),and glycerol conversion and product distribution in the TiO2-catalyzed photocatalytic oxidation of glycerol was studied at ambient conditions.In the absence of an electron acceptor,only HO^·radicals were generated by irradiated UV light and TiO2.However,in the presence of the two electron acceptors,both HO^· radical and ^1O2 were produced by irradiated UV light and TiO2 in different concentrations that depended on the concentration of the electron acceptor.The use of H2O2 as an electron acceptor enhanced glycerol conversion more than O2.The type of generated value-added compounds depended on the concentration of the generated ROS. 展开更多
关键词 Glycerol oxidation Titanium dioxide PHOTOCATALYST electron acceptor
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Non-fullerene small molecule electron acceptors for high-performance organic solar cells 被引量:1
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作者 Hao Lin Qiang Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第4期990-1016,共27页
Fullerenes and their derivatives are important types of electron acceptor materials and play a vital role in organic solar cell devices. However, the fullerene acceptor material has some difficulties to overcome the i... Fullerenes and their derivatives are important types of electron acceptor materials and play a vital role in organic solar cell devices. However, the fullerene acceptor material has some difficulties to overcome the intrinsic shortcomings, such as weak absorption in the visible range, difficulty in modification and high cost, which limit the performance of the device and the large-scale application of this type of acceptors. In recent years, non-fullerene electron acceptor material has attracted the attention of scientists due to the advantages of adjustable energy level, wide absorption, simple synthesis, low processing cost and good solubility. Researchers can use the rich chemical means to design and synthesize organic small molecules and their oligomers with specific aggregation morphology and excellent optoelectronic prop- erties. Great advances in the field of synthesis, device engineering, and device physics of non-fullerene acceptors have been achieved in the last few years. At present, non-fullerene small molecules based photovoltaic devices achieve the highest efficiency more than 13% and the efficiency gap between fullerenetype and non-fullerene-type photovoltaic devices is gradually narrowing. In this review, we explore recent progress of non-fullerene small molecule electron acceptors that have been developed and led to highefficiency photovoltaic devices and put forward the prospect of development in the future. 展开更多
关键词 Organic solar cells Non-fullerene electron acceptors Bulk heterojunction
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Molecular design towards two-dimensional electron acceptors for efficient non-fullerene solar cells 被引量:1
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作者 Yan Liu Zixian Liu +5 位作者 Zhicheng Hu Yuanying Liang Zhenfeng Wang Zhongxin Chen Fei Huang Yong Cao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第12期190-198,共9页
Non-fullerene polymer solar cells(NF-PSCs) have gained wide attention recently. Molecular design of non-fullerene electron acceptors effectively promotes the photovoltaic performance of NF-PSCs. However,molecular elec... Non-fullerene polymer solar cells(NF-PSCs) have gained wide attention recently. Molecular design of non-fullerene electron acceptors effectively promotes the photovoltaic performance of NF-PSCs. However,molecular electron acceptors with 2-dimensional(2 D) configuration and conjugation are seldom reported.Herein, we designed and synthesized a series of novel 2 D electron acceptors for efficient NF-PSCs. With rational optimization on the conjugated moieties in both vertical and horizontal direction, these 2 D electron acceptors showed appealing properties, such as good planarity, full-spectrum absorption, high absorption extinction coefficient, and proper blend morphology with donor polymer. A high PCE of 9.76%was achieved for photovoltaic devices with PBDB-T as the donor and these 2 D electron acceptors. It was also found the charge transfer between the conjugated moieties in two directions of these 2 D molecules contributes to the utilization of absorbed photos, resulting in an exceptional EQE of 87% at 730 nm. This work presents rational design guidelines of 2 D electron acceptors, which showed great promise to achieve high-performance non-fullerene polymer solar cells. 展开更多
关键词 Two-dimensional molecules Perylene diimide electron acceptors Molecular design Non-fullerene solar cells
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Characterization of phosphorus removal bacteria in (AO)^2 SBR system by using different electron acceptors 被引量:1
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作者 蒋轶锋 王琳 +3 位作者 余颖 王宝贞 刘硕 沈峥 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第2期155-159,共5页
Characteristics of phosphorus removal bacteria were investigated by using three different types of electron acceptors, as well as the positive role of nitrite in phosphorus removal process. An (AO)^2 SBR (anaerobic... Characteristics of phosphorus removal bacteria were investigated by using three different types of electron acceptors, as well as the positive role of nitrite in phosphorus removal process. An (AO)^2 SBR (anaerobic-aerobic-anoxic-aerobic sequencing batch reactor) was thereby employed to enrich denitrifying phosphorus removal bacteria for simultaneously removing phosphorus and nitrogen via auoxic phosphorus uptake, Ammonium oxidation was controlled at the first phase of the nitrification process. Nitrite-inhibition batch tests illustrated that nitrite was not an inhibitor to phosphorus uptake process, but served as an alternative electron acceptor to nitrate and oxygen if the concentration was under the inhibition level of 40mg NO2 - N·L^- 1. It implied that in addition to the two well-accepted groups of phosphorus removal bacterium ( one can only utilize oxygen as electron acceptor, P1, while the other can use both oxygen and nitrate as electron acceptor, P2 ), a new group of phosphorus removal bacterium P3, which could use oxygen, nitrate and nitrite as electron acceptor to take up phosphorus were identified in the test system. To understand (AO)^2 SBR sludge better, the relative population of the different bacteria in this system, plus another A/O SBR sludge ( seed sludge) were respectively estimated by the phosphorus uptake batch tests with either oxygen or nitrate or nitrite as electron acceptor. The results demonstrated that phosphorus removal capability of (AO)^2 SBR sludge had a little degradation after A/O sludge was cultivated in the (AO)^2 mode over a long period of time. However, deuitrifying phosphorus removal bacteria ( P2 and P3 ) was significantly enriched showed by the relative population of the three types of bacteria, which implied that energy for aeration and COD consumption could be reduced in theory. 展开更多
关键词 phosphorus removal bacteria electron acceptor NITRITE NITRATE OXYGEN (AO)^2 SBR
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PHOTOINDUCED CHARGE TRANSFER POLYMERIZATION OF STYRENE INITIATED BY ELECTRON ACCEPTOR
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作者 曹维孝 张鹏 冯新德 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1995年第3期259-263,共5页
Photoinduced charge transfer polymerization of styrene(St) with electron acceptor as initiator was investigated. In case of fumaronitrile (FN) or maleic anhydride (MA) as initiator the polymerization takes place regul... Photoinduced charge transfer polymerization of styrene(St) with electron acceptor as initiator was investigated. In case of fumaronitrile (FN) or maleic anhydride (MA) as initiator the polymerization takes place regularly, whereas the tetrachloro-1,4-benzenequinone (TCQ), 2,3-dichloro-5, 6-dicyano-1, 4-benzenequinone (DDQ). or tetracyano ethylene (TCNE) as initiator the polymerization proceeds reluctantly only after the photoaddition reaction. A mechanism was proposed that free radicals would be formed following the charge and proton transfer in the exciplex formed between St and electron accepters. 展开更多
关键词 STYRENE electron acceptor PHOTOINDUCED POLYMERIZATION
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Fused thienobenzene-thienothiophene electron acceptors for organic solar cells
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作者 Ye Xu Haotian Jiang +5 位作者 Tsz-Ki Lau Jingshuai Zhu Jiayu Wang Xinhui Lu Xiaowei Zhan Yuze Lin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第10期58-65,共8页
Small molecule ladder-type heteroarenes IHBT-2F is designed and synthesized with strong electrondonating and molecular packing properties, where the central unit, fused thienobenzene-thienothiphene (IHBT), is attached... Small molecule ladder-type heteroarenes IHBT-2F is designed and synthesized with strong electrondonating and molecular packing properties, where the central unit, fused thienobenzene-thienothiphene (IHBT), is attached with the strong electron-deficient 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (2FIC) as the end group. The counterpart IDBT-2F with indancenodibenzothiophene (IDBT) mainchain is sythesized for comparison, in which thieno[3,2-b]thiophene (TT) core of IHBT is replaced by benzene core. Relative to benzene-core IDBT-2F, TT-core IHBT-2F shows a much higher highest occupied molecular orbital energy level (IHBT-2F:-5.46 eV;IDBT-2F:-5.72 eV) and significantly redshifted absorption, due to the π-donor capability of the sulfur atom, the larger π-conjugation and stronger intermolecular π-π stacking. The as-cast organic solar cells (OSCs) based on blends of PTB7-Th donor and IHBT-2F acceptor without additional treatments exhibit power conversion efficiencies (PCEs) as high as 8.74%, which is much higher than that of PTB7-Th:IDBT-2F (6.73%). 展开更多
关键词 ORGANIC solar cell FUSED RING electron acceptor Thienobenzene Non-fullerene
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Synthesis and Cation-Mediated Electron Transfer in Fluorescence Quenching of Donor-Acceptor Podands
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作者 Hua JIANG Hui Jun XU Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing, 100101 《Chinese Chemical Letters》 SCIE CAS CSCD 2000年第9期767-770,共4页
Reduced rate constants of photoinduced electron transfer in intramolecular fluorescence quenching of donor-acceptor podands induced by cation-complexation are observed in the highly exothermic reactions.
关键词 electron transfer DONOR acceptor PODANDS
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Degraded model of radiation-induced acceptor defects for GaN-based high electron mobility transistors(HEMTs)
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作者 范隆 郝跃 +3 位作者 赵元富 张进城 高志远 李培咸 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第7期2912-2919,共8页
Using depletion approximation theory and introducing acceptor defects which can characterize radiation induced deep-level defects in AlGaN/GaN heterostructures,we set up a radiation damage model of AlGaN/GaN high elec... Using depletion approximation theory and introducing acceptor defects which can characterize radiation induced deep-level defects in AlGaN/GaN heterostructures,we set up a radiation damage model of AlGaN/GaN high electron mobility transistor (HEMT) to separately simulate the effects of several main radiation damage mechanisms and the complete radiation damage effect simultaneously considering the degradation in mobility. Our calculated results,consistent with the experimental results,indicate that thin AlGaN barrier layer,high Al content and high doping concentration are favourable for restraining the shifts of threshold voltage in the AlGaN/GaN HEMT;when the acceptor concentration induced is less than 10^14cm-3,the shifts in threshold voltage are not obvious;only when the acceptor concentration induced is higher than 10^16cm-3,will the shifts of threshold voltage remarkably increase;the increase of threshold voltage,resulting from radiation induced acceptor,mainly contributes to the degradation in drain saturation current of the current-voltage (Ⅰ-Ⅴ) characteristic,but has no effect on the transconductance in the saturation area. 展开更多
关键词 GaN-based high electron mobility transistor (HEMT) radiation acceptor DEFECTS
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定向调控电子受体强化好氧颗粒污泥内源反硝化脱氮除磷
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作者 李冬 李雨朦 +2 位作者 蒋鹏飞 王天朔 张杰 《中国环境科学》 EI CAS CSCD 北大核心 2024年第10期5426-5434,共9页
为强化内源反硝化作用,加强对有限碳源的高效利用,设置了1组厌氧/好氧/缺氧(A/O/A)和3组不同好氧时间分配的厌氧-两级短时好氧/缺氧(A/(O/A)_(2))序批式反应器,探究定向调控电子受体下污泥的颗粒化及反硝化聚糖菌(DGAOs)的富集情况.结... 为强化内源反硝化作用,加强对有限碳源的高效利用,设置了1组厌氧/好氧/缺氧(A/O/A)和3组不同好氧时间分配的厌氧-两级短时好氧/缺氧(A/(O/A)_(2))序批式反应器,探究定向调控电子受体下污泥的颗粒化及反硝化聚糖菌(DGAOs)的富集情况.结果表明,采用两级短时好氧/缺氧的反应器好氧颗粒污泥结构更加致密、沉淀性能更好,缺氧段及好氧段电子受体更充足,DGAOs储存内碳源的能力得以强化,系统中反硝化聚糖菌和DGAOs对碳源的竞争达到平衡状态,系统有更高的内源反硝化脱氮率,实现了深度脱氮除磷.其中,两级短时好氧时间分配时间为前段60min/后段30min的R2的脱氮除磷效果最好,DGAOs含量最高,且颗粒沉降性能最佳.第45d,R2的COD、TN、TP去除率分别达到90.52%、85.71%、92.73%,内源反硝化效率达到58.59%,具有良好的污染物去除效果. 展开更多
关键词 好氧颗粒污泥 电子受体 脱氮除磷 内碳源 反硝化聚糖菌
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基于喹喔啉和吡啶并吡嗪及咔唑和二苯胺衍生物电子给体-受体结构荧光材料的合成和光电性能
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作者 周永慧 黄如军 +5 位作者 姚东超 张艾巍 孙渝杭 陈柱君 朱柏松 郑佑轩 《无机化学学报》 SCIE CAS CSCD 北大核心 2024年第4期701-712,共12页
通过α-二酮与邻苯二胺、吡啶二胺缩合反应,构建了喹喔啉和吡啶并吡嗪衍生物作为电子受体,分别以二苯胺、咔唑衍生物为电子给体,合成了4个具有电子给体-电子受体结构的氮杂环荧光材料F1~F4。通过低温荧光/磷光光谱、荧光寿命测试,结合... 通过α-二酮与邻苯二胺、吡啶二胺缩合反应,构建了喹喔啉和吡啶并吡嗪衍生物作为电子受体,分别以二苯胺、咔唑衍生物为电子给体,合成了4个具有电子给体-电子受体结构的氮杂环荧光材料F1~F4。通过低温荧光/磷光光谱、荧光寿命测试,结合密度泛函理论计算可知,F1~F4均为荧光小分子。室温荧光光谱结果表明,利用电子给体和受体的电子效应不同可以调控材料的发光颜色,其中三苯胺相对于苯基咔唑的供电子能力更强,表现为F1比F2、F3比F4红移现象更加明显;而吡啶并吡嗪具有多氮的缺电子结构,与喹喔啉相比共轭程度增加,导致F3比F1、F4比F2发生的斯托克斯位移数值增大。总之,F1~F4的甲苯溶液最大荧光光谱发射峰位于529、464、568和507 nm,荧光寿命分别为12.21、2.61、9.76和6.03 ns,荧光量子效率最高可达98.2%,具有良好的发光性能。将F1~F4发光材料掺杂在主体材料中制备了有机电致发光二极管DF1~DF4。所得器件DF1和DF3性能更好,最大电流效率分别为13.38和11.98 cd·A-1,且最大外量子效率分别达到4.8%和4.5%。 展开更多
关键词 荧光分子 电子给体和受体 喹喔啉 吡啶并吡嗪 有机发光二极管
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全小分子有机太阳能电池研究进展
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作者 周雪 王莎莎 +4 位作者 刘兵 吴令霞 郑春英 马继平 谷传涛 《化工新型材料》 CAS CSCD 北大核心 2024年第9期43-47,共5页
近年来,非富勒烯小分子受体材料(SMAs)由于具有高吸收系数、能级和带隙可调、优异的电学性质和光伏性能等优点受到广泛关注,设计和合成高性能SMAs已成为有机太阳能电池(OSCs)的研究热点。得益于SMAs的快速发展,OSCs的能量转换效率在几... 近年来,非富勒烯小分子受体材料(SMAs)由于具有高吸收系数、能级和带隙可调、优异的电学性质和光伏性能等优点受到广泛关注,设计和合成高性能SMAs已成为有机太阳能电池(OSCs)的研究热点。得益于SMAs的快速发展,OSCs的能量转换效率在几年内从3%~4%提高到19%。在成功合成小分子受体材料ITIC和Y6基础上,研究人员对分子结构设计进行了深入研究,开发出许多性能优异的SMAs。这些SMAs在提高器件效率和太阳能电池性能方面发挥了至关重要的作用。综述了全小分子OSCs的研究进展,并展望了未来OSCs的发展方向。 展开更多
关键词 有机太阳能电池 非富勒烯小分子受体材料 小分子给体材料 能量转换效率
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基于污水同步脱氮除磷的反硝化聚磷菌的研究与展望
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作者 王小楠 卞晓峥 +1 位作者 黄健平 胡越洋 《河南化工》 CAS 2024年第4期17-20,32,共5页
与传统的好氧除磷技术相比,反硝化除磷具有节约碳源、一碳两用、减少污泥产量等优点。综述了反硝化脱氮除磷过程中的主要功能微生物反硝化聚磷菌的培养、分离筛选、电子受体利用等研究的相关进展,总结了近年来研究中常见的反硝化聚磷菌... 与传统的好氧除磷技术相比,反硝化除磷具有节约碳源、一碳两用、减少污泥产量等优点。综述了反硝化脱氮除磷过程中的主要功能微生物反硝化聚磷菌的培养、分离筛选、电子受体利用等研究的相关进展,总结了近年来研究中常见的反硝化聚磷菌,并对其未来的发展前景做出展望。 展开更多
关键词 反硝化除磷 反硝化聚磷菌 筛选 电子受体 假单胞菌
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EDA复合物介导的光催化合成全氟取代异喹啉二酮
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作者 周涵 黄斌 +2 位作者 刘浩淼 胡美艳 唐石 《化工技术与开发》 CAS 2024年第5期42-45,共4页
本文开发了一个由电子供体受体(EDA)复合物介导、可见光诱导合成全氟取代异喹啉二酮骨架的反应。该反应无需过渡金属光敏剂催化,反应条件温和,具有绿色环保、清洁高效的特点。
关键词 电子供体受体 无过渡金属催化 可见光诱导 异喹啉二酮
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Near-infrared non-fused electron acceptors for efficient organic photovoltaics
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作者 Wenxiang Ma Xinyu He +3 位作者 Tianyi Chen De-Li Ma Hongzheng Chen Chang-Zhi Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第4期436-441,共6页
Developing narrow-bandgap organic semiconductors is important to facilitate the advancement of organic photovoltaics(OPVs). Herein, two near-infrared non-fused ring acceptors(NIR NFRAs), PTBFTT-F and PTBFTT-Cl have be... Developing narrow-bandgap organic semiconductors is important to facilitate the advancement of organic photovoltaics(OPVs). Herein, two near-infrared non-fused ring acceptors(NIR NFRAs), PTBFTT-F and PTBFTT-Cl have been developed with A-π_A-π_D-D-π_D-π_A-A non-fused structures. It is revealed that the introduction of electron deficient π-bridge(π_A) and multiple intramolecular noncovalent interactions effectively retained the structural planarity and intramolecular charge transfer of NFRAs, extending strong NIR photon absorption up to 950 nm. Further, the chlorinated acceptor, with the enlarged π-surface compared to the fluorinated counterpart, promoted not only molecular stacking in solid, but also the desirable photochemical stability in ambient, which are helpful to thereby improve the exciton and charge dynamics for the corresponding OPVs. Overall, this work provides valuable insights into the design of NIR organic semiconductors. 展开更多
关键词 Organic photovoltaic NEAR-INFRARED Non-fused electron acceptor Noncovalent interaction STABILITY
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Enhancing Photovoltaic Performance of Nonfused-Ring Electron Acceptors via Asymmetric End-Group Engineering and Noncovalently Conformational Locks
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作者 Bo Liu Congqi Li +6 位作者 Xiaobin Gu Yinghui Han Zhixiang Wei Yunhao Cai Xin Zhang Hui Huang Yanping Huo 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2024年第5期485-490,共6页
By employing the asymmetric end-group engineering,an asymmetric nonfused-ring electron acceptor(NFREA)was designed and synthesized.Compared with the symmetric analogs(NoCA-17 and NoCA-18),NoCA-19 possesses broader lig... By employing the asymmetric end-group engineering,an asymmetric nonfused-ring electron acceptor(NFREA)was designed and synthesized.Compared with the symmetric analogs(NoCA-17 and NoCA-18),NoCA-19 possesses broader light absorption range,more coplanarπ-conjugated backbone,and appropriate crystallinity according to the experimental and theoretical results.The organic solar cells based on J52:NoCA-19 exhibited a power conversion efficiency as high as 12.26%,which is much higher than those of J52:NoCA-17(9.50%)and J52:NoCA-18(11.77%),mainly due to more efficient exciton dissociation,better and balanced charge mobility,suppressed recombination loss,shorter charge extraction time,longer charge carrier lifetimes,and more favorable blend film morphology.These findings demonstrate the great potential of asymmetric end-group engineering in exploring low-cost and high-performance NFREAs. 展开更多
关键词 Organic solar cells Nonfused-ring electron acceptors Asymmetric end-group engineering Noncovalently conformational locks Low-cost acceptors
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基于2-氰基吡啶电子受体的热激活延迟荧光材料
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作者 汪青松 张富俊 +5 位作者 徐慧慧 陈思浛 张千峰 童碧海 陈平 孔辉 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2024年第3期73-83,共11页
合成了4种以2-氰基吡啶为电子受体的发光材料,考察了不同电子给体对材料发光性能的影响.研究结果表明,化合物5-(10H-吩噻嗪-10-基)吡啶腈(PTPN)的单晶结构中,吡啶环之间的分子间氢键及吩噻嗪基团之间的C-H···π分子间相... 合成了4种以2-氰基吡啶为电子受体的发光材料,考察了不同电子给体对材料发光性能的影响.研究结果表明,化合物5-(10H-吩噻嗪-10-基)吡啶腈(PTPN)的单晶结构中,吡啶环之间的分子间氢键及吩噻嗪基团之间的C-H···π分子间相互作用使吡啶环与噻吩基团之间形成共平面的构型,导致其发光由薄膜中的520 nm蓝移至400 nm.4种化合物在聚甲基丙烯酸甲酯(PMMA)薄膜中的发光波长在434~520 nm之间.化合物5-(10H-吩噁嗪-10-基)吡啶腈(PXPN),PTPN和5-[9,9-二甲基吖啶-10(9H)-基]吡啶腈(DAPN)的光致发光量子效率(PLQY)在0.17~0.57之间,具有热激活延迟荧光(TADF)发光性质,延迟荧光寿命在4.1~5.3μs之间,单重态/三重态能隙(ΔEST)在0.045~0.069 eV之间.化合物5-(3,6-二叔丁基-9H-咔唑-9-基)吡啶腈(BCPN)的PLQY为0.91,发光寿命为12.4 ns,为荧光发射.电致发光器件性能测试表明,4种材料均发射绿光,其中DAPN的综合器件性能最佳,掺杂器件的最大亮度可达2855 cd/m^(2),峰值电流效率(CE)、功率效率(PE)和外量子效率(EQE)分别为37.6 cd/A,12.6 lm/W和10.4%.基于化合物BCPN的器件形成了高效的电致激基复合物,器件的最大亮度可达2367 cd/m^(2),峰值CE,PE和EQE分别为29.3 cd/A,11.5 lm/W和9.4%.该研究表明,氰基吡啶受体能形成稳定的分子间氢键,可用于TADF材料的开发. 展开更多
关键词 热激活延迟荧光 有机电致发光 氰基吡啶 电子受体
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A novel metal-free porous covalent organic polymer for efficient room-temperature photocatalytic CO_(2) reduction via dry-reforming of methane
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作者 Sheng-Yan Yin Ziyi Li +2 位作者 Yingcai Hu Xiao Luo Jishan Li 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第9期1407-1418,共12页
At room temperature,the conversion of greenhouse gases into valuable chemicals using metal-free catalysts for dry reforming of methane(DRM) is quite promising and challenging.Herein,we developed a novel covalent organ... At room temperature,the conversion of greenhouse gases into valuable chemicals using metal-free catalysts for dry reforming of methane(DRM) is quite promising and challenging.Herein,we developed a novel covalent organic porous polymer (TPE-COP) with rapid charge separation of the electron–hole pairs for DRM driven by visible light at room temperature,which can efficiently generate syngas (CO and H_(2)).Both electron donor (tris(4-aminophenyl)amine,TAPA) and acceptor (4,4',4'',4'''-((1 E,1'E,1''E,1'''E)-(ethene-1,1,2,2-tetrayltetrakis (benzene-4,1-diyl))tetrakis (ethene-2,1-diyl))tetrakis (1-(4-formylbenzyl)quinolin-1-ium),TPE-CHO) were existed in TPE-COP,in which the push–pull effect between them promoted the separation of photogenerated electron–hole,thus greatly improving the photocatalytic activity.Density functional theory (DFT) simulation results show that TPE-COP can form charge-separating species under light irradiation,leading to electrons accumulation in TPE-CHO unit and holes in TAPA,and thus efficiently initiating DRM.After 20 h illumination,the photocatalytic results show that the yields reach 1123.6 and 30.8μmol g^(-1)for CO and H_(2),respectively,which are significantly higher than those of TPE-CHO small molecules.This excellent result is mainly due to the increase of specific surface area,the enhancement of light absorption capacity,and the improvement of photoelectron-generating efficiency after the formation of COP.Overall,this work contributes to understanding the advantages of COP materials for photocatalysis and fundamentally pushes metal-free catalysts into the door of DRM field. 展开更多
关键词 METAL-FREE Photocatalytic CO_(2)reduction Covalent organic polymer Dry-reforming of methane electron donor and acceptor
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光诱导基于EDA机理构建S-芳基黄原酸酯新策略
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作者 杨道山 左峻泽 《河南师范大学学报(自然科学版)》 CAS 北大核心 2024年第3期1-9,共9页
黄原酸酯类化合物作为药物化学、农业化学、材料化学中重要的组成部分,一直备受化学家们的关注.寻找简单、高效合成S-芳基取代黄原酸酯的方法引起了研究者广泛的关注.报道了一种可见光诱导下基于硫负离子与噻蒽盐间的EDA(电子供体受体)... 黄原酸酯类化合物作为药物化学、农业化学、材料化学中重要的组成部分,一直备受化学家们的关注.寻找简单、高效合成S-芳基取代黄原酸酯的方法引起了研究者广泛的关注.报道了一种可见光诱导下基于硫负离子与噻蒽盐间的EDA(电子供体受体)过程实现C-S键构建的新策略.在温和无金属的条件下,以中等至优良的收率得到了一系列S-芳基黄原酸酯,克级实验与日光实验证明了反应的应用潜力,为黄原酸酯类化合物的合成提供了一种新思路. 展开更多
关键词 黄原酸酯 EDA复合物 噻蒽盐 可见光诱导 C-S键的构建
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