The current research of ultralong room-temperature phosphorescence (RTP) materials is mainly focused on the lifetimes and efficiencies. The tuning of emission colors is in high demand for various potential applications in optoelectronics, however the corresponding research lags behind. Herein, we report three ultralong RTP molecules based on the carbazole and chromone units through isomerization engineering. By adjusting the linking positions of the carbazole substituents, the ultralong RTP emission can be tuned from blue to red band along with lifetime variation. Detailed experimental and theoretical investigations reveal that the changeable emission color emerges from the mixing of multiple phosphorescence bands and have great relation to the stacking of carbazole and chromone chromophores. These materials were used to construct anti-counterfeiting patterns with diverse afterglow emission colors, presenting a promising application potential in the field of information security.

目前对超长室温磷光（RTP）材料的研究主要集中在寿命和效率上。对于光电子学中各种潜在的应用，对发射颜色的调整有很高的要求，但是相应的研究却落后了。在本文中，我们通过异构化工程报道了基于咔唑和色酮单元的三个超长RTP分子。通过调节咔唑取代基的连接位置，可以将超长RTP发射随寿命变化从蓝色调为红色。详细的实验和理论研究表明，可变的发射颜色是由多个磷光带的混合产生的，并且与咔唑和发色团发色团的堆积有很大关系。