有机小分子电致红色荧光材料的研究进展

有机电致发光器件(OLEDs)具有效率高、驱动电压低、亮度高、响应速度快以及能实现大面积彩色显示等优点,是近年来发光显示领域的研究热点.在红绿蓝三基色电致荧光器件中,绿光器件的能量转换效率和器件寿命最高 ,而红光和蓝光器件的性能则较差,这直接影响了OLED的产业化进程.近年来,通过采用掺杂结构,使红色电致荧光器件的能量转换效率和器件的稳定性有了显著提高,可以达到10lm/W及106h,但是需要在较低的电流密度下获得,因此开发新型材料具有重要的意义.综述了近年来有机电致红色荧光材料领域的国内外研究进展.     

芘荧光材料的研究进展

目的研究芘及其衍生物在荧光探针以及有机电致发光方面的应用进展。方法简述芘荧光材料的来源及结构特点,分析荧光材料的特点,综述芘及其衍生物在荧光探针方面的应用研究进展,包括跟踪纳米复合水凝胶的形成过程,定量监测乳胶膜形成过程中聚合物的分散,研究燕麦β-葡聚糖溶液中的疏水微区,以及检测水溶液中的金属汞离子,综述芘及其衍生物在有机电致发光方面的应用研究进展,并展望其在水性防伪荧光油墨中的发展前景。结论芘荧光材料除了应用于荧光探针以及有机电致发光等方面,也可以作为功能性荧光颜料用来制成水性荧光油墨,从而应用于防伪包装中。     

红色热激活延迟荧光材料的研究进展

通过反向系间窜越,热激活延迟荧光(TADF)材料可以同时利用三线态激子和单线态激子,使器件的理论内量子效率突破传统荧光材料的25%,达到理论上的100%,可与磷光材料相媲美,且材料价格便宜无需贵金属,因而受到人们广泛关注。近年来,对绿光及蓝光材料的研究进展较快,而红光材料由于分子结构的合理设计比较困难,研究进展相对较慢。从受体的类型出发,综述了近年来有关红色TADF材料的研究进展,并结合现有工作,对红色TADF材料的发展前景进行了展望。     

有机电致发光二极管蓝光材料的研究进展

有机电致发光二极管(Organic light-emitting diode, OLED)在显示和照明领域中应用潜力巨大。蓝光作为三基色之一,是OLED中不可或缺的一部分。但是,蓝光材料禁带宽度大,所需激发能量过高,容易影响蓝光器件的效率与寿命,这限制了OLED的发展和应用。因此,发展高效、稳定的纯蓝光材料是实现低成本、高质量、长寿命商业化OLED的前提。本文综述了具有100%内量子效率的磷光蓝光材料和热活化延迟荧光材料的最新发展。同时,针对使用二元共混发光层系统的溶液处理存在的结晶性、相分离、基体材料选择以及精确控制掺杂剂浓度等问题,探究了蒽类发光材料、聚集诱导延迟荧光以及“热激子”材料作为非掺杂发光层材料在OLED领域的发展。本文系统综述了蓝光OLED研究的最新进展,为开发稳定、纯蓝的电致发光材料提供多种思路和借鉴。     

新型红色有机电致发光材料

红色发光材料一直是有机电致发光中为烯缺的材料,也是电致发光全色显示不可缺少的材料。通过设计和合成得到了一种新型红色电发光材料,（2,3’－二羟基偶氮苯）－（8－羟基喹啉）合铝（Ⅲ）（Al（azb-q））,该材料为一种铝的金属络合物,含有两种配体：8－羟基喹啉和2,2’－二羟基偶氮苯。实验证明,该材料具有较高的热稳定性较好的成膜特性,同时材料本身具有一定的电了传输能力。电致发光器件证实了该材料的红色发光特性和良好色度学性质。     

"光子-买一赠三”--简评有机三线态电致发光材料与器件进展*

有机电致发光材料与器件的研究已取得了重要进展,但要实现高信息含量的应用,器件的稳定性和效率仍须进一步提高。基于量子统计理论的研究结果表明,只有25%的电子空穴复合能量生成单线态激子,对于一个纯荧光的发光材料,在理论上,其器件效率的上限是光致发光效率的25%。三线态发光材料的应用,理论上可有效利用所有的复合能量,从而大幅度提高器件效率,目前已成为有机电致发光领域的研究热点。综述了有机三线态电致发光材料与器件的进展。     

基于一种高效空穴传输材料的有机电致发光器件研究

开发了一种新型的空穴传输材料H40,以其制成的器件(ITO/H40/Alq3/LiFAl)最高发光强度达到10300cd/m2;未经封装的另一种器件(ITO/H40\Alq3\MgAg),发光强度由150cd/m2衰减到50cd/m2的时间达到1h.与传统的空穴传输材料TPD相比,H40制成的器件具有更好的热稳定性,器件的工作寿命也长得多.同时发现通过适量的掺杂能够调节器件的发光颜色.     

咔唑衍生物在有机电致发光材料中的研究进展

综述了近几年来咔唑衍生物在有机电致发光材料中的研究进展,包括提高玻璃化转变温度、提高光量子产率、开发白光OLED材料和AIE效应材料等方面的研究进展情况.     

异佛尔酮类有机电致发光材料的研究进展

异佛尔酮只有一个可以发生缩合反应的甲基,产物合成简单,容易提纯,具有高的荧光量子效率和稳定性。综述了异佛尔酮衍生物在红色有机电致发光材料中的研究进展,对部分结构、发光性能等进行了归纳、总结,对其发展前景进行了展望。     

Limitations and Perspectives on Triplet‐Material‐Based Organic Photovoltaic Devices

Organic photovoltaic cells (OPVs) have attracted broad attention and become a very energetic field after the emergence of nonfullerene acceptors. Long‐lifetime triplet excitons are expected to be good candidates for efficiently harvesting a photocurrent. Parallel with the development of OPVs based on singlet materials (S‐OPVs), the potential of triplet materials as photoactive layers has been explored. However, so far, OPVs employing triplet materials in a bulk heterojunction have not exhibited better performance than S‐OPVs. Here, the recent progress of representative OPVs based on triplet materials (T‐OPVs) is briefly summarized. Based on that, the performance limitations of T‐OPVs are analyzed. The shortage of desired triplet materials with favorable optoelectronic properties for OPVs, the tradeoff between long lifetime and high binding energy of triplet excitons, as well as the low charge mobility in most triplet materials are crucial issues restraining the efficiencies of T‐OPVs. To overcome these limitations, first, novel materials with desired optoelectronic properties are urgently demanded; second, systematic investigation on the contribution and dynamics of triplet excitons in T‐OPVs is necessary; third, close multidisciplinary collaboration is required, as proved by the development of S‐OPVs.     

具有激发态性质的新型有机半导体材料

高度评价了国内在三线态有机电致发光材料、有机半导体复合材料中的光伏极性反转、共轭聚合物中的光致极化反转的研究中取得的创新性成果，旨在增加研究者对有机半导体材料激发态及其性质的研究这一新兴领域的了解和认识，引起学术界对激发态有机半导体材料的深思与讨论，共同探索有机光电信息材料研究领域中创新的源头。     

Recent Progress of Singlet‐Exciton‐Harvesting Fluorescent Organic Light‐Emitting Diodes by Energy Transfer Processes

The external quantum efficiency (EQE) of organic light‐emitting diodes (OLEDs) has been dramatically improved by developing highly efficient organic emitters such as phosphorescent emitters and thermally activated delayed fluorescent (TADF) emitters. However, high‐EQE OLED technologies suffer from relatively poor device lifetimes in spite of their high EQEs. In particular, the short lifetimes of blue phosphorescent and TADF OLEDs remain a big hurdle to overcome. Therefore, the high‐EQE approach harvesting singlet excitons of fluorescent emitters by energy transfer processes from the host or sensitizer has been explored as an alternative for high‐EQE OLED strategies. Recently, there has been a big jump in the EQE and device lifetime of singlet‐exciton‐harvesting fluorescent OLEDs. Recent progress on the materials and device structure is discussed herein.     

Toward Design of Novel Materials for Organic Electronics

Materials for organic electronics are presently used in prominent applications, such as displays in mobile devices, while being intensely researched for other purposes, such as organic photovoltaics, large‐area devices, and thin‐film transistors. Many of the challenges to improve and optimize these applications are material related and there is a nearly infinite chemical space that needs to be explored to identify the most suitable material candidates. Established experimental approaches struggle with the size and complexity of this chemical space. Herein, the development of simulation methods is addressed, with a particular emphasis on predictive multiscale protocols, to complement experimental research in the identification of novel materials and illustrate the potential of these methods with a few prominent recent applications. Finally, the potential of machine learning and methods based on artificial intelligence is discussed to further accelerate the search for new materials.     

太阳能电池有机电子传输材料研究新进展

当今能源危机问题日益紧迫,以太阳能为代表的新能源开发成为研究热点。有机半导体材料具有成本低廉、可塑性强、性能优异等特点,因此在太阳能电池领域中具有极大的应用前景。研发性能优异、成本低、稳定性高的有机电子传输材料是太阳能电池研究领域的重要内容。总结了近年来有机电子传输材料的研究进展和发展方向,按照其分子结构分为富勒烯衍生物、大π共轭体系、非π体系、改性材料、碳纳米材料等5类体系,分别介绍了其结构特性,讨论了其在太阳能电池应用中存在的问题及解决方法,综述了该领域的最新研究成果,最后总结了开发新型高效的有机电子传输材料的研究方向。     

有机相变材料制备技术的研究进展

综述了有机相变材料在制备技术方面的研究进展.相变材料的应用范围越来越广泛,为了满足日益严格的使用要求,制备技术不断发展,在克服原有缺陷的同时,其综合性能越来越高.作为国际上相变材料研究的热点,潜热型功能热流体、定型相变蓄能材料和纳米复合储能材料正日益受到重视.     

Organic Materials for Deep Blue Phosphorescent Organic Light‐Emitting Diodes

Recently, great progress has been made in the device performance of deep blue phosphorescent organic light‐emitting diodes (PHOLEDs) by developing high triplet energy charge‐transport materials, high triplet energy host and deep blue emitting phosphorescent dopant materials. A high quantum efficiency of over 25% and a high power efficiency of over 15 lm/W have already been achieved at 1000 cd m^?2 in the deep blue PHOLEDs with a y color coordinate less than 0.20. In this work, recent developments in organic materials for high efficiency deep blue PHOLEDs are reviewed and a future strategy for the development of high efficiency deep blue PHOLEDs is proposed.