A series of shoulder pole-shaped D-A-D molecules were first synthesized by bridging two asymmetrical diphenyl sulfone units with alkynyl linker. Among them, compound ETOSPz displays remarkable white-light emission with thermally activated delayed fluorescence (TADF) and mechanochromic luminescence (MCL) properties. The crystal structure analysis revealed the alterable conformation of phenothiazine, which is identified as a reasonable explanation for MCL behavior. Combined with the theoretical calculation, EtOSPz exhibits a small singlet-triplet splitting energy (ΔE_ST) which is good for RICS process, and the ΔE_ST could be modified by introducing an alkynyl linker into two diphenyl sulfones or adjusting substituents on the diphenyl sulfone. Notably, a multifunctional organic white-light TADF material was first developed via linking a alkyne group into two diphenyl sulfones. Importantly, the multifunctional character of diphenyl sulfone could be adjusted by a straightforward linker, which offers a new approach for the development of new optical-electro materials.

首先通过将两个不对称的二苯基砜单元与炔基连接基桥接，合成了一系列肩杆状DAD分子。其中，化合物ETOSPz显示出显着的白光发射，并具有热激活的延迟荧光（TADF）和机械致变色发光（MCL）特性。晶体结构分析揭示了吩噻嗪的可变构象，这被确定为MCL行为的合理解释。与理论计算相结合，EtOSPz显示出小的单线态-三线态能量分裂（ΔE _ST），这是RICS过程好，且ΔE _ST可以通过将炔基连接基引入两个二苯砜或调节二苯砜上的取代基来进行修饰。值得注意的是，首先通过将炔基连接到两个二苯砜中来开发多功能有机白光TADF材料。重要的是，二苯砜的多功能特性可以通过简单的接头来调节，这为开发新型光电子材料提供了一种新方法。