• • Stimuli-responsive RTP materials enable dynamic afterglow modulation under external triggers (light, pH, heat, mechanical force, solvent), with reported ultralong phosphorescence lifetimes exceeding 1 s and color tunability across the visible spectrum, as exemplified by UV-irradiation-responsive systems achieving dynamic ultralong phosphorescence in polymeric matrices (Nat Commun, 2021, 12: 2297).
• • Host-guest doping and polymerization strategies have achieved multistage stimulus-responsive RTP with high contrast and reversibility, enabling temporally programmable luminescence for anti-counterfeiting and encryption; for instance, amorphous molecular 'triplet exciton pump' systems demonstrate dynamic ultra-long RTP with spatial and temporal resolution (Angew Chem Int Ed, 2024, 63: e202317631).
• • Single-component molecular crystals and multicomponent copolymers exhibit color-tunable ultralong organic phosphorescence, with emission colors tunable from blue to red and lifetimes up to several seconds, as demonstrated in Nat Photonics (2019, 13: 406) and Nat Commun (2020, 11: 944).
• • pH-responsive amorphous RTP polymers based on fluorescein show reversible afterglow switching with response times on the order of minutes, and red-light-excited near-infrared RTP films achieve efficient metal-free phosphorescence, expanding the spectral window for bioimaging and sensing (Chin Chem Lett, 2021, 32: 3039; Natl Sci Rev, 2022, 9: nwab085).