作者:Xiangyang Tang、Liang Yao、He Liu、Fangzhong Shen、Shitong Zhang、Yunan Zhang、Huanhuan Zhang、Ping Lu、Yuguang Ma
DOI:10.1039/c4tc00456f
日期:——
In this paper, we report the design and synthesis of a novel bipolar violet emitting molecule CzPySiSF. The carbazole and pyridine moieties are employed to facilitate charge injection and balance carrier transport, whereas the spirofluorene is used as the violet emitter. The three functional groups, i.e., carbazole, pyridine and spirofluorene, are connected to tetraphenylsilane in a stepwise fashion using classical coupling reactions such as Suzuki and Ullmann. The resultant bipolar molecule CzPySiSF exhibits very stable thermal properties and a uniform amorphous morphology. The introduction of spirofluorene greatly enhances the fluorescence quantum efficiency of the molecule; moreover the PL spectrum of CzPySiSF in THF is mainly located in the violet region. The EL spectrum of CzPySiSF matches well with the PL spectrum with a maximum at 408 nm. The violet OLED of CzPySiSF exhibits the maximum external quantum efficiency of 0.59%.
本文报道了一种新型双极性紫光发射分子CzPySiSF的设计与合成。咔唑和吡啶基团用于促进电荷注入和平衡载流子传输,而螺二芴则作为紫光发射体。三个功能团,即咔唑、吡啶和螺二芴,通过经典的偶联反应如铃木反应和乌尔曼反应逐步连接到四苯基硅烷上。所得双极性分子CzPySiSF表现出非常稳定的热性质和均匀的非晶形态。螺二芴的引入大大提高了该分子的荧光量子效率;此外,CzPySiSF在THF中的PL光谱主要位于紫光区域。CzPySiSF的EL光谱与PL光谱吻合良好,最大值在408 nm处。CzPySiSF的紫光OLED显示出最大的外部量子效率为0.59%。