Nonconjugated Hyperbranched Polyether Emitting Ultralong Room Temperature Phosphorescence with Tunable Emission and Afterglow

Development of a nonconjugated room temperature phosphorescence(RTP) system with a lifetime longer than 1 s remains a challenge.Here, we report a nonconjugated RTP polymer composed of amide-terminatedhyperbranched polyether cross-linked with boric acid, whose phosphorescencelifetime can reach up to 2.40 s with a maximum absolute quantum yieldof 26.5%. Moreover, their phosphorescent emission wavelength can betuned from 517 to 585 nm by changing the excitation wavelength from300 to 480 nm, while the afterglow color can be regulated from blueto yellow-red. Particularly, the nonconjugated RTP polymer exhibitsa dual stimulus response to humidity and temperature, so it is expectedto find applications in anti-counterfeiting. The present study providesa strategy to design an RTP system with tunable emission and prolongedafterglow.