蒽及其衍生物在有机场效应晶体管中的应用

近年来,有机场效应晶体管因其低成本、可低温制备、与柔性衬底兼容,以及能够大面积制备等优势而备受关注,其性能也在不断提高。其中并苯类化合物作为一类非常重要的有机半导体材料得到了广泛的关注和研究。渡越时间法测试表明蒽的迁移率能够达到3.0 cm²V^-1s^-1,应该具有较好的场效应晶体管应用。人们对蒽及其衍生物进行了一系列的研究,取得了很大的成功。这里,我们对蒽及其衍生物在有机场效应晶体管中的应用做一个较为全面的综述,期望为国内外同行提供一定的参考。     

高迁移率有机薄膜晶体管材料进展

对近几年来高迁移率有机薄膜晶体管材料研究的主要发展作了简要介绍和评述,讨论了高迁移率有机半导体材料存在的问题和发展方向．     

有机盐发光材料研究进展

有机盐发光材料因其离子性而具有光热稳定性好、熔点高、水溶性好、强静电相互作用及生物相容性好等优点,在生物监测、防伪和光学材料等领域展现出广阔的应用前景.目前,一系列基于氮杂环芳香鎓盐、季铵盐、季鏻盐以及基于柔性烯键和腙键等特定性能的有机盐发光材料被开发出来.该综述对有机盐发光材料的分子设计、发光原理及其最新研究进展进行了分类总结,并对该领域的发展进行了展望.     

蒽端基聚对苯亚乙炔的发光性能

报道了一种新的蒽端基聚对苯亚乙炔的合成与发光特性,分别考察了聚合物 P2的紫外吸收,荧光发射和电致发光光谱。结果表明,在聚对苯亚乙炔主链末端引 入蒽基团可改变其有效共轭长长及发光颜色,合成的模型小分子可证明这一点。电 致发光器件ITO/P2/Al在600 nm处发红光。     

聚苯乙烯类发光材料研究进展

高分子发光材料具有良好的溶液加工特性,是发展低成本、大面积平板显示和固体照明器件的重要基础材料。聚苯乙烯类发光材料在合成方法上具有聚合方法简单、无需使用催化剂、无卤素原子残留等优势,在化学结构上具有非共轭主链结构和易于引入功能化侧链等特点,在发光特性上具有宽带隙特征,近年来发展成为一类重要的高分子发光材料。本文从材料和器件角度,围绕聚苯乙烯类荧光材料、聚苯乙烯类磷光材料和聚苯乙烯类热活化延迟荧光材料的分子设计和电致发光性能,综述了聚苯乙烯类发光材料的研究进展,分析总结了其未来发展所面临的机遇和挑战。     

有机偏振发光材料及其成膜技术研究进展

本文对近年来有机偏振发光及其发光材料和成膜技术的发展进行了综述。重点从材料化学结构与偏振发光的关系出发,系统地讨论了几类发光材料的性质、定向排列成膜的方法及其有机偏振发光器件的制作和应用。     

有机电致发光红色发光材料研究进展

本文总结了近年来有机金属配合物、分子内电荷转移化合物、稠环芳香类化合物以及齐聚物等几类有机电致发光红色发光材料的研究进展,详细介绍了它们在有机电致发光器件中的应用,并对有机电致发光红色发光材料未来的研究方向作了展望.     

基于有机双层的双极性有机场效应晶体管研究进展

由双极性有机场效应晶体管(OFETs)制备的有机互补电路具有操作电压低、能耗低和成本低等优点,在有机互补电路方面有很大的应用前景,引起了科学家们极大的研究兴趣.同时具有高且匹配的空穴迁移率和电子迁移率的双极性有机半导体分子是制备高性能有机互补电路的必要条件之一,然而迄今为止该类双极性有机半导体分子的报道比较少,大部分双...     

高分子发光材料研究进展

高分子发光材料具有可溶液加工的特点,适于制备低成本、大面积发光器件,在平板显示和固体照明领域具有潜在的应用前景.近年来,高分子发光材料在发光机制、材料体系和器件性能等方面均取得了重要进展,各项性能得到了大幅度提升.本文从材料和器件角度,围绕高分子荧光材料、高分子磷光材料和高分子热活化延迟荧光材料的分子设计策略,总结和评述了高分子荧光材料的颜色调控和效率提升途径,高分子磷光材料的磷光掺杂剂、高分子主体、拓扑结构等因素对发光性能的影响规律,以及高分子热活化延迟荧光材料的设计原理和典型材料体系.同时,分析了高分子发光材料未来发展面临的机遇和挑战.     

蒽类衍生物的电荷传输性质

以具有较高迁移率的对称取代类蒽的衍生物{2,6-二[2-(4-戊基苯基)乙烯基]蒽,DPPVAnt;2,6-二-噻吩蒽,DTAnt;2,6-二[2-己基噻吩]蒽,DHTAnt}为研究对象,采用密度泛函理论的B3LYP方法,在6-31G(d)的基组水平上研究了三种蒽类衍生物的分子结构、电子结构、重组能和电荷传输积分,采用Einstein关系式计算了室温下的载流子迁移率,并与蒽的相关计算结果进行了比较.DPPVAnt是较好的空穴传输材料,其空穴迁移率为0.49cm2·V-1·s-1;DHTAnt有利于电子传输,其电子迁移率为0.12cm2·V-1·s-1;而DTAnt是一种较好的双极性材料,其空穴迁移率和电子迁移率分别为0.069和0.060cm2·V-1·s-1.计算得到的迁移率与实验结果处于同一数量级.三种蒽类衍生物的电子重组能与蒽的相近,而空穴重组能均大于蒽的空穴重组能,大小顺序为蒽DPPVAntDTAntDHTAnt.这与计算的迁移率结果不一致,说明分子的堆积结构决定材料的电荷传输性质.     

High Electron Mobility Hot-Exciton Induced Delayed Fluorescent Organic Semiconductors

The development of high mobility emissive organic semiconductors is of great significance for the fabrication of miniaturized optoelectronic devices, such as organic light emitting transistors. However, great challenge exists in designing key materials, especially those who integrates triplet exciton utilization ability. Herein, dinaphthylanthracene diimides (DNADIs), with 2,6-extended anthracene donor, and 3′- or 4′-substituted naphthalene monoimide acceptors were designed and synthesized. By introducing acceptor-donor-acceptor structure, both materials show high electron mobility. Moreover, by fine-tuning of substitution sites, good integration with high solid state photoluminescence quantum yield of 26 %, high electron mobility of 0.02 cm² V⁻¹ s⁻¹, and the feature of hot-exciton induced delayed fluorescence were obtained in 4′-DNADI. This work opens a new avenue for developing high electron mobility emissive organic semiconductors with efficient utilization of triplet excitons.     

Recent Progresses on the High Performance Organic Electrochemical Transistors

Organic electrochemical transistor(OECT) with bulk current modulation capability based on the ion penetration into the organic semiconducting channel exhibits unique features, including high transconductance, low voltage and large capacitance. The high current at a low voltage, together with the compatibility with aqueous environment, makes OECT particularly suitable for bioelectronic applications, such as biological interfacing, printed logic circuitry and neuromorphic devices. However, the operation mechanism and structure-performance relationship of OECT are rather complicated and remain unclear to date. One of the critical issues is the ion penetration and transportation process. This review focuses on the research progresses of how to improve the OECT performance specifically through materials design, interfacing and morphology modulation. Different strategies of promoting the ion doping process are compared and discussed in order to optimize the device performance so that a deep understanding of the OECT operation principle could be gained.     

Recent Advances in Isoindigo‐Inspired Organic Semiconductors

Over the past decade, isoindigo has become a widely used electron‐deficient subunit in donor‐acceptor organic semiconductors, and these isoindigo‐based materials have been widely used in both organic photovoltaic (OPV) devices and organic field effect transistors (OFETs). Shortly after the development of isoindigo‐based semiconductors, researchers began to modify the isoindigo structure in order to change the optoelectronic properties of the resulting materials. This led to the development of many new isoindigo‐inspired compounds; since 2012, the Kelly Research Group has synthesized a number of these isoindigo analogues and produced a variety of new donor‐acceptor semiconductors. In this Personal Account, recent progress in the field is reviewed. We describe how the field has evolved from relatively simple donor‐acceptor small molecules to structurally complex, highly planarized polymer systems. The relevance of these materials in OPV and OFET applications is highlighted, with particular emphasis on structure‐property relationships.     

Highly Emissive Fused Heterocyclic Alkynylgold(III) Complexes for Multiple Color Emission Spanning from Green to Red for Solution‐Processable Organic Light‐Emitting Devices

A new class of fused heterocyclic tridentate ligand‐containing alkynylgold(III) complexes with tunable emission color has been successfully designed and synthesized. Structural modification of the σ‐donating fused heterocyclic alkynyl ligands, including substituted fluorene, carbazole, and triphenylamine, enables a large spectral shift of about 110 nm (ca. 3310 cm^?1) that covers the green to red region to be realized with the same tridentate ligand‐containing alkynylgold(III) complexes in solid‐state thin films. Interestingly, the energy of the excimeric emission can be controlled by the rational design of the fused heterocyclic alkynyl ligands. Superior solution‐processable organic light‐emitting devices (OLEDs) with high external quantum efficiencies (EQEs) of 12.2, 13.5, 9.3, and 5.2 % were obtained with green, yellow, orange, and red emission. These high EQE values are comparable to those of the vacuum‐deposited OLEDs based on structurally related alkynylgold(III) complexes.     

聚合物纳米药物载体的研究进展

近年来,大量研究结果表明纳米技术可显著提高传统药物的疾病治疗效果,并在生物医学领域引起了广泛关注.迄今,多种聚合物纳米体系已被研发并用于药物的靶向递送.随着纳米技术的不断发展,各类生物微环境响应的功能基团也被应用于构筑新型药物载体,以提高患病部位的药物富集及减少药物的毒副作用.聚合物纳米药物载体在癌症治疗、代谢类疾病治疗及抗菌等方面展现出巨大潜力.本文系统评述了聚合物纳米药物载体的最新研究进展及在生物医药方面的应用.     

Synthesis and Characteristics of Organic Red‐Emissive Materials Based on Phenanthro[9,10‐d]imidazole

Red emission is one of the three primary colors that are essential for the realization of full‐color displays and solid‐state lightings. A high solid‐state efficiency is a crucial factor for the applications in organic light‐emitting diodes (OLEDs). In this work, two new donor‐acceptor‐donor type phenanthro[9,10‐d]imidazole (PIM)‐based derivatives, (2Z,2′Z)‐2,2′‐(1,4‐phenylene)bis(3‐(4‐(1‐phenyl‐1H‐phenanthro[9,10‐d]imidazol‐2‐yl)phenyl)acrylonitrile) ( PIDSB ) and 2,3‐bis(4′‐(1‐phenyl‐1H‐phenanthro[9,10‐d]imidazol‐2‐yl)‐[1,1′‐biphenyl]‐4‐yl)fumaronitrile ( PIDPh ), are designed and synthesized. Both of them possess high thermal stabilities. PIDPh shows typical characteristics of aggregation‐induced emission enhancement, while PIDSB displays an aggregation‐caused quenching effect. They both exhibit significant red‐shifted emissions compared with PIM owing to intramolecular charge transfer. In the film state, the emission peaks of PIDSB and PIDPh are located at 538 nm and 605 nm with high photoluminescent quantum yields of 63.82 % and 41.26 %, respectively. The non‐doped OLED using PIDPh as the active layer shows the maximum external quantum efficiency of 2.06 % with a very low efficiency roll‐off, and exhibits the electroluminescent peak at 640 nm with a Commission Internationale de l′Éclairage coordinate of (0.617,0.396), meeting well the criteria of red OLEDs.     

卤素原子的引入对二苯甲基自由基光稳定性、光物理性质及电致发光器件性能的影响

通过在N-咔唑基-二(2,4,6-三氯苯)甲基自由基(Cz BTM)的咔唑基团的3和6位引入卤素原子,合成了3个新的自由基分子(3,6-二氟-N-咔唑基)二(2,4,6-三氯苯)甲基自由基(F₂CzBTM)、(3,6-二氯-N-咔唑基)二(2,4,6-三氯苯)甲基自由基(Cl₂CzBTM)及(3,6-二溴-N-咔唑基)二(2,4,6-三氯苯)甲基自由基(Br₂CzTM).通过对比3个自由基分子与CzBTM的理论计算结果、电化学性质、光物理性质以及光稳定性,发现对于电子给-受体型的发光自由基,其光物理性质是外围取代基团的电负性和分子空间构型共同作用的结果.Cl₂CzBTM和Br₂CzTM具有较高的光致发光荧光量子效率,而F₂CzBTM在光照下具有最长的光致发光半衰期.与以CzBTM为发光层制备的电致发光器件相比,以Cl₂CzBTM和Br₂CzTM为发光层制备的有机电致发光器件的光谱均发生了蓝移,器件的最大外量子效率...     

Unique Solid‐State Emission Behavior of Aromatic Difluoroboronated β‐Diketones as an Emitter in Organic Light‐Emitting Devices

Aromatic difluoroboronated β‐diketone ( BF₂DK ) derivatives are a widely known class of luminescent organic materials that exhibit high photoluminescent quantum efficiency and unique aggregation‐dependent fluorescence behavior. However, there have been only a few reports on their use in solid‐state electronic devices, such as organic light‐emitting devices (OLEDs). Herein, we investigated the solid‐state properties and OLED performance of a series of π‐extended BF₂DK derivatives that have previously been shown to exhibit intense fluorescence in the solution state. The BF₂DK derivatives formed exciplexes with a carbazole derivative and exhibited thermally activated delayed fluorescence (TADF) behavior to give orange electroluminescence with a peak external quantum efficiency of 10 % that apparently exceeds the theoretical efficiency limit of conventional fluorescent OLEDs (7.5 %), assuming a light out‐coupling factor of 30 %.