Metal-Free organic polymeric room temperature phosphorescence system with Multi-Colour and ultralong lifetime

Room -temperature -phosphorescent (RTP) metal -free organic polymer materials with long-lasting luminescence properties have received considerable attention in the field of optical materials. Herein, we report unique RTP polymeric materials with ultralong-lasting multicolor luminescence prepared using a series of organic phosphorescent guest molecules and melamine formaldehyde resins. Because of facile thermal cross -linking, these materials exhibit a stable multicolor long-lasting afterglow with a maximum phosphorescence lifetime of > 1 s and a maximum phosphorescence emission efficiency of up to 3.4 %. In addition, polymer doping systems with flexible processability were easily printed on 2D substrates and further used as patterned security labels with fullcolor dynamic phosphorescence. Further, different materials were combined to form a ternary digital encryption system. In addition, although reports on 3D -printed phosphorescent materials are scarce, by using a similar thermoforming method, we successfully prepared a 3D -molding phosphorescent material that can exhibit a satisfactory long-lasting afterglow even after it is kept underwater for 30 days. In conclusion, this work will usher in advancements in the development and application of metal -free polymer -based RTP materials with longlasting luminescence and 3D printing potential.