Li Qiuxia, Shi Chao, Huang Manli, Wei Xing, Yan Hong, Yang Chuluo, Yuan Aihua
School of Material Science and Engineering , Jiangsu University of Science and Technology , Zhenjiang 212003 , P. R. China . Email:
School of Environmental and Chemical Engineering , Jiangsu University of Science and Technology , Zhenjiang 212003 , P. R. China.
Chem Sci. 2019 Jan 18;10(11):3257-3263. doi: 10.1039/c8sc04252g. eCollection 2019 Mar 21.
A novel family of B- and N-embedded phosphorescent iridium complexes has been prepared. Single crystal structures indicate that the B-embedded polycyclic unit exhibits better planarity than the N-embedded polycyclic unit, which leads to different π-π-stacking and electrical characteristics. More importantly, by controlling the number of boron or nitrogen atoms embedded, solution-processed OLED devices incorporating these emitters as emitting layers can achieve a phosphorescence color variation from green to deep red (638 nm) and show low-efficiency roll-off and turn-on voltage. In particular, the B-embedded complex Ir-BB shows good color purity with a narrow full width at half maximum (1211 cm) and CIE coordinates (0.67, 0.31) in the deep red light region. Notably, B-embedded iridium complexes can also react with two different Lewis bases (pyridine and DMAP) to form intriguing B-N Lewis adducts through different coordination modes. During this process, significantly different structural and optical changes are triggered by the structure and electronic properties of Lewis bases, as confirmed by X-ray crystallographic, H NMR and spectral analysis.
已制备出一类新型的嵌入硼和氮的磷光铱配合物。单晶结构表明，嵌入硼的多环单元比嵌入氮的多环单元表现出更好的平面性，这导致了不同的π-π堆积和电学特性。更重要的是，通过控制嵌入的硼或氮原子的数量，以这些发射体作为发光层的溶液处理OLED器件可以实现从绿色到深红色（638 nm）的磷光颜色变化，并显示出低效率滚降和开启电压。特别是，嵌入硼的配合物Ir-BB在深红色光区域具有良好的色纯度，半高宽较窄（1211 cm），CIE坐标为（0.67, 0.31）。值得注意的是，嵌入硼的铱配合物还可以与两种不同的路易斯碱（吡啶和DMAP）反应，通过不同的配位模式形成有趣的B-N路易斯加合物。在此过程中，路易斯碱的结构和电子性质引发了显著不同的结构和光学变化，这通过X射线晶体学、1H NMR和光谱分析得到了证实。
