Highly Efficient Organic Blue Electroluminescent Materials and Devices with Mesoscopic Structures
Highly Efficient Organic Blue Electroluminescent Materials and Devices with Mesoscopic Structures
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具有介观结构的高效有机蓝色电致发光材料与器件
DOI：
10.1002/tcr.201800140
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发表时间：
2019
期刊：
影响因子：
6.6
通讯作者：
Xiao Lixin
中科院分区：
文献类型：
--
作者：
Bian Mengying;Chen Zhijian;Qu Bo;Xiao Lixin
由于难以同时实现高效率和高色纯度，蓝光发射成为制约oled性能和稳定性的因素。自2003年以来，我们一直致力于有机发光二极管（oled）的研究，特别是蓝光。经过一系列的分子设计，从不同的角度提出了新的策略。首先，通过高扭曲结构的分子设计来抑制荧光猝灭和红移，可以实现高效的深蓝发射。采用具有聚集诱导发射（AIE）特性的扭曲结构来抑制分子聚集，采用三重态融合（TTF）和杂化局域电荷转移（HLCT）来提高三重态激子的使用比例。其次，可以通过改善电荷输运来实现高效的蓝色OLED。为了控制器件中电荷的输运平衡，研究了一种具有宽带隙的新型电子输运材料。第三，通过非耦合层的介观结构可以实现高效的深蓝发射。采用自聚集的方法在金属电极上制备了介观光子结构有机薄膜，以提高光失偶效率。
Due to the difficulty in achieving high efficiency and high color purity simultaneously, blue emission is the limiting factor for the performance and stability of OLEDs. Since 2003, we have been working on organic light‐emitting diodes (OLEDs), especially on blue light. After a series of molecular designs, novel strategies have been proposed from different aspects. At first, highly efficient deep blue emission could be achieved through molecular design with highly twisted structure to suppress fluorescence quenching and redshift. Deep blue emitters with high efficiency in solid state, a twisted structure with aggregation induced emission (AIE) characteristics was incorporated to inhibit molecular aggregation, and triplet‐triplet fusion (TTF) and hybridized localized charge transfer (HLCT) were adopted to increase the ratio of triplet exciton used. Secondly, a highly efficient blue OLED could be achieved through improving charge transport. New electron transport materials (ETMs) with wide band gap were developed to control charge transport balance in devices. Thirdly, a highly efficient deep blue emission could be achieved through a mesoscopic structure of out‐coupling layer. A mesoscopic photonic structured organic thin film was fabricated on the top of metal electrode by self‐aggregation in order to improve the light out‐coupling efficiency.