Tetradentate Platinum(II) Complexes for Highly Efficient Phosphorescent Emitters and Sky Blue OLEDs
作者:Guijie Li、Xiangdong Zhao、Tyler Fleetham、Qidong Chen、Feng Zhan、Jianbing Zheng、Yun-Fang Yang、Weiwei Lou、Yuning Yang、Kun Fang、Zongzhou Shao、Qisheng Zhang、Yuanbin She
DOI:10.1021/acs.chemmater.9b04263
日期:2020.1.14
crystallographic analyses and theoretical calculations. The generation of excimer emissions is observed in the tetradentate 5/6/6 Pt(II) emitters for the first time and found to be concentration-dependent both in the solution and solid states. All of the Pt(II) emitters have high photoluminescent quantum efficiency of up to 100% and luminescent lifetime as short as 1.4 μs at room temperature, achieving
已经设计并合成了一系列含有稠合5/6/6金属环的四齿Pt(II)发射极。分子几何形状在确定光物理性质中起关键作用。它们的发射光谱受到分子核心骨架的几何形状,取代基,甚至氢原子及其位置的显着影响,X射线晶体学分析和理论计算进一步支持了它们。第一次在四齿5/6/6 Pt(II)发射器中观察到准分子发射的产生,并且发现在溶液态和固态下均受浓度的影响。所有Pt(II)发射器在室温下均具有高达100%的高光致发光量子效率,且发光寿命短至1.4μs,实现了7.14×10的辐射率5 s –1。通过对配体的杂芳环进行选择性合成修饰,可以轻松调整它们的发射颜色以覆盖整个可见区域(λmax = 464–632 nm)。基于Pt(1- ptz)的天蓝色有机发光二极管(OLED)的最大外部量子效率(EQE)为14.5%,但在1000 cd / m 2的高亮度下仍保持12.7%的EQE 。这项工作表明,这些四齿Pt