p‐Orbital Regulated Blue Room‐Temperature Phosphorescence from Commercial Triphenylchloromethane

Abstract Blue phosphorescence is confronted with significant challenges due to its need to populate and stabilize the relatively high‐energy excited states. Herein, blue room temperature phosphorescence is achieved by introducing a chlorine atom with three p‐orbitals to restrict the free rotation of triphenylmethane. Theoretical calculations indicate that the p‐orbital of the chlorine atom promotes the spatial conjugation of three benzene rings, thereby limiting their free rotation.