The synthesis of room temperature phosphorescent carbon dots (RTP-CDs) without any matrix is important in various applications.In particular, RTP-CDs with dual modes of glitter foam vellen action excitation are more interesting.Here, we successfully synthesized matrix-free carbonized polymer dots (CPDs) that can generate green RTP under visible and ultraviolet light dual-mode excitation.Using acrylic acid (AA) and ammonium oxalate as precursors, a simple one-pot hydrothermal method was selected to prepare AA-CPDs.
Here, acrylic acid is easy to polymerize under high temperature and high pressure, which makes AA-CPDs form a dense cross-linked internal structure.Ammonium oxalate as a nitrogen source can form amino groups during the reaction, which reacts with a large number of pendant carboxyl groups on the polymer chains to further form a cross-linked structure.The carboxyl and amino groups on the surface of AA-CPDs are connected by intermolecular hydrogen bonds.These hydrogen bonds 15-eg1053cl can provide space protection (isolation of oxygen) around the AA-CPDs phosphor, which can stably excite the triplet state.
This self-matrix structure effectively inhibits the non-radiative transition by blocking the intramolecular motion of CPDs.Under the excitation of WLED and 365 nm ultraviolet light, AA-CPDs exhibit the phosphorescence emission at 464 nm and 476 nm, respectively.The naked-eye observation exceeds 5 s and 10 s, respectively, and the average lifetime at 365 nm excitation wavelength is as long as 412.03 ms.
In addition, it successfully proved the potential application of AA-CPDs in image anti-counterfeiting.