Polymorphous Luminescent Materials Based on ′T′‐Shaped Molecules Bearing 4,7‐Diphenylbenzo[
<i>c</i>
][1,2,5]thiadiazole Skeletons: Effect of Substituents on the Photophysical Properties
作者:Gaowei Qian、Xiangbing Wang、Shengyue Wang、Yanqiong Zheng、Song Wang、Weiguo Zhu、Yafei Wang
DOI:10.1002/chem.201904026
日期:2019.12.2
Polymorphism, the intrinsic character of one chemical compound with at least two distinct phase arrangements, plays a very key role in the photophysical properties. In this contribution, four 'T'-shaped molecules bearing the 2,1,3-benzothiadiazole (BTD) skeleton, named 5 a-5 d, were prepared and characterized. All compounds exhibited excellent thermal stability and polymorphism in the solid state,
多态性是一种具有至少两种不同相排列的化合物的固有特征,在光物理性质中起着非常关键的作用。在此贡献中,制备并表征了带有2,1,3-苯并噻二唑(BTD)骨架的四个'T'形分子,命名为5 a-5 d。从热重分析,差示扫描量热法和偏光光学显微镜结果可以明显看出,所有化合物均在固态下表现出出色的热稳定性和多态性。在溶液(56-97%)和纯膜(33-98%)中均实现了具有高光致发光量子产率的强发射。所有化合物在溶液中均具有明显的pH依赖性发光特性。此外,由于晶体和非晶态之间的转变,化合物5d显示出有用的机械变色发光。使用化合物5 a-5 d作为掺杂剂,制备了可溶液处理的有机发光二极管(OLED),其最高外部量子效率为6.15%,高于基于荧光的OLED的理论值(〜5 %)。这项研究为设计基于BTD的高效多晶型发光材料提供了一种新颖的策略。