Multiemitting Ultralong Phosphorescent Carbonized Polymer Dots via Synergistic Enhancement Structure Design

Advancing a metal-free room temperature phosphorescent (RTP) material that exhibits multicolor emission, remarkable RTP lifetime, and high quantum yield still faces the challenge of achieving intersystem crossing between singly and triplet excited states, as well as the rapid decay of triplet excited states due to nonradiative losses. In this study, a novel strategy is proposed to address these limitations by incorporating o-phenylenediamine, which generates multiple luminescent centers, and long-chain polyacrylic acid to synthesize carbonized polymer dots (CPDs). These CPDs are then embedded in a rigid B2O3 matrix, effectively limiting nonradiative losses through the synergistic effects of polymer cross-linking and the rigid matrix. The resulting CPD-based materials exhibit remarkable ultralong phosphorescence in shades of blue and lime green, with a visible lifetime of up to 49 s and a high phosphorescence quantum yield. Simultaneously, this study demonstrates the practical applicability of these excellent material properties in anti-counterfeiting and information encryption. Developing room-temperature phosphorescent carbon dots with extended afterglow and multicolor emission is challenging. This work proposes a novel strategy using o-phenylenediamine and polyacrylic acid to synthesize carbonized polymer dots embedded in B2O3 matrix. The resulting materials exhibit dual-emitting ultralong phosphorescence in blue and lime green shades under different UV excitations, with a remarkable phosphorescence lifetime of up to 49 s and potential applications in anticounterfeiting and information encryption. image