Zhu Tianwen, Zheng Shuyuan, Yang Tianjia, Yuan Wang Zhang
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
J Phys Chem Lett. 2023 Jul 20;14(28):6451-6458. doi: 10.1021/acs.jpclett.3c01552. Epub 2023 Jul 12.
Pure organic persistent room-temperature phosphorescence (p-RTP) is in urgent demand for advanced optoelectronic and bioelectronic applications. However, it remains an enormous challenge to modulate the emission colors while simultaneously boosting the phosphorescence lifetimes and efficiencies. Herein, we report the co-crystallization between melamine and cyclic imide-based non-conventional luminophores, which affords co-crystals owning multiple hydrogen bonds and effective clustering of electron-rich units, thus resulting in diverse emissive species with highly rigidified conformations and promoted spin-orbit coupling. Consequently, p-RTP co-crystals with simultaneously enhanced efficiencies and lifetimes of up to 12.0% and 898 ms, alongside remarkably improved color tunability, are obtained. These results may spur the future rational design of high-performance p-RTP materials and advance the mechanism of understanding of the origin of color-tunable phosphorescence.
对于先进的光电子和生物电子应用而言，纯有机持久室温磷光（p-RTP）有着迫切需求。然而，在调节发光颜色的同时提高磷光寿命和效率仍然是一个巨大的挑战。在此，我们报道了三聚氰胺与基于环状酰亚胺的非常规发光体之间的共结晶，这产生了拥有多个氢键且富电子单元有效聚集的共晶体，从而导致具有高度刚性构象并促进自旋-轨道耦合的多种发光物种。因此，获得了p-RTP共晶体，其效率和寿命同时提高，分别高达12.0%和898毫秒，同时颜色可调性也得到显著改善。这些结果可能会推动未来高性能p-RTP材料的合理设计，并推进对颜色可调磷光起源机制的理解。
