RGB Small Molecules Based on a Bipolar Molecular Design for Highly Efficient Solution-Processed Single-layer OLEDs
RGB Small Molecules Based on a Bipolar Molecular Design for Highly Efficient Solution-Processed Single-layer OLEDs
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基于双极分子设计的 RGB 小分子，用于高效溶液加工单层 OLED
DOI：
10.1002/chem.201101476
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发表时间：
2012-02-01
影响因子：
4.3
通讯作者：
Ma, Yuguang
中科院分区：
文献类型：
--
作者：
Yao, Liang;Xue, Shanfeng;Ma, Yuguang
在本文中，我们描述了一个双极分子设计的小分子溶液加工的有机发光二极管（OLED）。结合共轭发射核的刚性和外围烷基连接的咔唑基团的柔性，两个系列的高效双极RGB（红，绿色，蓝色）发光体已被合成和表征。发射核由吸电子基团组成，咔唑基团赋予材料供电子单元。这种双极结构有利于载流子注入和平衡。在T系列材料（TCDqC、TCSoC、TCBzC、TCNzC）中引入四个外围咔唑基团，并且在O系列材料（OCDqC、OCSoC、OCBzC、OCNzC）中引入另外四个外围咔唑基团。在ITO/PEDOT：PSS/发光层/CsF/Al的单层结构下，两种绿色器件的最大发光效率均超过6.4 cd？A-1，以及超过6700 cd？m-2此外，与T系列相比，基于O系列材料的蓝色和红色器件的发光效率从1.6增加到2.8 cd？A-1和0. 2至1. 3 cd？A-1，分别。据我们所知，基于OCSoC的蓝色器件的性能是迄今为止报道的蓝色小分子溶液处理单层器件中最好的。
In this paper, we describe a bipolar molecular design for small molecule solution-processed organic light emitting diodes (OLEDs). Combining the rigidity of the conjugated emissive cores and the flexibility of the peripheral alkyl-linked carbazole groups, two series of highly efficient bipolar RGB (red, green, blue) emitters have been synthesized and characterized. The emissive cores are composed of electron-withdrawing groups; the carbazole groups endow the materials electron-donating units. Such bipolar structures are advantageous for the carrier injection and balance. Four peripheral carbazole groups are introduced in T-series materials (TCDqC, TCSoC, TCBzC, TCNzC), and another four in O-series materials (OCDqC, OCSoC, OCBzC, OCNzC). With the single-layer device configuration of ITO/PEDOT:PSS/emitting layer/CsF/Al, two green devices exhibited excellent performance with a maximum luminescence efficiency of over 6.4 cd?A-1, and a high maximum luminance of more than 6700 cd?m-2. In addition, compared with the T-series, the luminescence efficiency of blue and red devices based on O-series materials increased from 1.6 to 2.8 cd?A-1 and 0.2 to 1.3 cd?A-1, respectively. To our knowledge, the performance of the blue device based on OCSoC is among the best of the blue small-molecule solution-processed single-layer devices reported so far.