This study presents a novel strategy to develop a metal-free room temperature phosphorescent (RTP) material with multicolor emission, long lifetime, and high quantum yield. The researchers synthesized carbonized polymer dots (CPDs) by incorporating o-phenylenediamine and long-chain polyacrylic acid, which generate multiple luminescent centers. These CPDs were then embedded in a rigid B₂O₃ matrix to limit nonradiative losses through cross-linking and the matrix's constraints. The resulting CPD-based materials exhibit ultralong phosphorescence in blue and lime green shades, with a visible lifetime of up to 49 seconds and a high phosphorescence quantum yield. The study demonstrates the practical applications of these materials in anti-counterfeiting and information encryption, showing their potential for diverse applications in security and communication technologies.This study presents a novel strategy to develop a metal-free room temperature phosphorescent (RTP) material with multicolor emission, long lifetime, and high quantum yield. The researchers synthesized carbonized polymer dots (CPDs) by incorporating o-phenylenediamine and long-chain polyacrylic acid, which generate multiple luminescent centers. These CPDs were then embedded in a rigid B₂O₃ matrix to limit nonradiative losses through cross-linking and the matrix's constraints. The resulting CPD-based materials exhibit ultralong phosphorescence in blue and lime green shades, with a visible lifetime of up to 49 seconds and a high phosphorescence quantum yield. The study demonstrates the practical applications of these materials in anti-counterfeiting and information encryption, showing their potential for diverse applications in security and communication technologies.