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Article Abstract
The development of eco-friendly time-dependent phosphorescent color (TDPC) materials faces a critical paradox: Boron oxide (BO) derived from commercial boric acid (BO-) exhibits stable room-temperature phosphorescence (RTP) regardless of purity, while ultrapure synthetic analogs remain non-emissive. Here, this dilemma is resolved by engineering carbon dots (CDs) doped into BO- at ultralow concentrations (10 ppb), achieving programmable TDPC through three breakthroughs. Synergistic host-guest confinement amplifies green RTP efficiency by an order of magnitude enhancement while activating yellow guest emission; Defect-mediated exciton transfer extends RTP lifetimes to 304 ms, doubling BO-; Time-resolved chromatic evolution (Δλ = 65 nm) emerges exclusively in doped systems, enabled by bifurcated decay kinetics from dual confinement mechanisms. The CDs@BO exhibits remarkable stability in harsh liquids, overcoming stability barriers for encryption applications. This ppb-level doping strategy circumvents purity debates while preserving host crystallinity-a critical advance toward scalable anti-counterfeiting tags and bioimaging probes with programmable temporal-color responses.
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