Metal-free pure organic room-temperature phosphorescence (ORTP) materials have attracted widespread attention in the fields of information security, optoelectronics and displays. Hydrogen-bonded organic frameworks (HOFs) can potentially stabilize the triplet excitons and achieve highly efficient RTP. However, it is still a tough challenge to prepare HOFs with ultra-long lifetime RTP. Herein, we report a facile and green hydrothermal method to synthesize rigid melamine-cyanuric acid (M-CA) supramolecular frameworks by a melamine hydrothermal reaction. The luminescence properties of M-CA supramolecular HOFs have been explored under ambient conditions for the first time. There are three modes of luminescence under ambient conditions, including prompt fluorescence, delayed fluorescence (DF) and RTP. The M-CA material shows a long RTP lifetime of 864.1 ms, which is over 7000 times longer than that of melamine itself. The effective intermolecular interactions suppress nonradiative transition of the triplet excitons, enhance the intersystem crossing and provide an oxygen-insulated environment, thus boosting RTP emission. In addition, due to dual emission properties of RTP and fluorescence, the obtained M-CA supramolecular HOFs can be potentially applied in the field of information encryption.

无金属的纯有机室温磷光（ORTP）材料在信息安全，光电和显示领域引起了广泛的关注。氢键有机骨架（HOF）可以稳定三重态激子并实现高效的RTP。然而，制备具有超长寿命RTP的HOF仍然是一个艰巨的挑战。在这里，我们报告了一种简便而绿色的水热方法，通过三聚氰胺水热反应合成硬质三聚氰胺-氰尿酸（M-CA）超分子骨架。首次在环境条件下研究了M-CA超分子HOF的发光特性。在环境条件下有三种发光模式，包括即时荧光，延迟荧光（DF）和RTP。M-CA材料的RTP寿命很长，为864。1毫秒，是三聚氰胺本身的7000倍以上。有效的分子间相互作用抑制了三重态激子的非辐射跃迁，增强了系统间的穿越并提供了一个氧绝缘的环境，从而提高了RTP的发射。另外，由于RTP和荧光的双重发射性质，所获得的M-CA超分子HOF可以潜在地应用于信息加密领域。