Zinc-Doping Trap Engineering and FRET Synergy Enable Multicolor Room-Temperature Phosphorescence in Rice-Derived Carbon Dots Confined in Amorphous Alumina for Advanced Encryption.
basic_science · Level V
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- Record sourced from PubMed, PMID 42163647.
- Also identified by DOI 10.1002/adma.73441.
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Abstract
The development of multicolor room-temperature phosphorescence (RTP) materials with tunable afterglow is crucial for advanced information encryption. Herein, we propose a synergistic strategy that integrates trap engineering and Förster resonance energy transfer (FRET) process for dynamically adjusting the emission color and lifetime. Expired rice-derived carbon dots@Zn-doping alumina (CDs@Zn<sub>x</sub>Al<sub>2</sub>O<sub>3</sub>) composites with standout RTP properties are designed and fabricated using an in situ preparation strategy. In situ Zn<sup>2+</sup> doping is employed to engineer trap states within amorphous Al<sub>2</sub>O<sub>3</sub>, which not only optimizes the energy level structure of confined CDs but also enables precise modulation of phosphorescence color and lifetime. The optimized CDs@Zn<sub>1.5%</sub>Al<sub>2</sub>O<sub>3</sub> composite achieves an ultralong green RTP duration of up to 22 s. Furthermore, by introducing newly synthesized red-emissive TPA-β-CD-aggregates with excellent aggregation-induced emission (AIE) performance as an energy acceptor, efficient singlet-to-singlet and triplet-to-singlet FRET (SS-FRET/TS-FRET) pathways are established. Tuning the doping ratio allows dynamic control over the competition between these pathways, resulting in finely adjustable multicolor RTP emissions. This work demonstrates a versatile platform for creating color-tunable, ultralong RTP materials and showcases their direct application in time-gated, multilevel security encryption.