Ultralong Blue Organic Room-Temperature Phosphorescence Promoted by Green Assembly

In recent years, there is a growing interest in developing ultralong organic room-temperature phosphorescence (ORTP) with lifetimes in the range of seconds. As one of the important three primary colors, ultralong blue ORTP is an indispensable core component in RTP regulation and application, however, the large Stokes shift characteristics pose certain challenges in developing ultralong blue ORTP. Here, a new family of blue phosphors are synthesized and ultralong blue ORTP are realized through crystal assembly in water and organic phase. Remarkably, compared to crystal materials obtained in organic phases, assembly materials obtained in water enabled long-lived blue ORTP with lifetimes up to 2.3 s and phosphorescence quantum yield reached as high as 29.27%. In addition to the efficient and green assembly form, such dark blue ORTP materials possessed high thermal stability and flexible tunability. Moreover, the superiority of the selected assembly components is demonstrated by comparing them with polymer assembly and the proposed blue ORTP materials show great potential in an organic programmable information encryption/anti-counterfeiting. Blue phosphors of dimethyl alkoxy isophthalates are designed and their assembly platforms with ultralong dark blue room-temperature phosphorescence are constructed via two self-assembly approaches based on aqueous and organic phases. Notably, assembly materials in water (H2O-MCA@G) possess a significantly extended lifetime with high efficiency, tunability, and stability, making them potential candidates for multilevel information security. image