• • The TPN/NaCl and DPB/NaCl systems exhibit dynamic RTP exclusively after sequential thermal activation and UV irradiation, demonstrating a binary stimulus requirement for phosphorescence switching.
• • Residual water and triplet oxygen act as initial quenchers of triplet excitons; their gradual removal triggers a competitive evolution between TTA and phosphorescence, as evidenced by time-resolved spectral data showing a decrease in integrated intensity from 346,863.758 to 334,175.719 over 52–60 minutes.
• • The in situ formation of NaCl ionic crystals via cation-anion exchange provides an appropriately rigid confinement that balances rigidity and flexibility, enabling both suppression of non-radiative losses and responsiveness to external stimuli.
• • The strategy resolves the long-standing conflict between rigidity and responsiveness in organic RTP materials, offering a general design principle for constructing stimulus-responsive dynamic RTP systems.