Thermoluminescence

Physics

Nanotechnology

Organic chemistry

Halogen

Hydrogen bond

Phosphorescent organic light-emitting diode

Luminescence

Excited state

Phosphorescence

Atomic physics

Intermolecular force

Halogen bond

Exciton

Chemistry

Materials science

Molecule

Singlet state

Alkyl

Quantum mechanics

Optoelectronics

Intersystem crossing

Photochemistry

Fluorescence

Persistent luminescence

Angewandte Chemie International Edition

Monotonous luminescence has always been a major factor limiting the application of organic room-temperature phosphorescence (RTP) materials. Enhancing and regulating the intermolecular interactions between the host and guest is an effective strategy to achieve excellent phosphorescence performance. In this study, intermolecular halogen bonding (CN⋅⋅⋅Br) was introduced into the host-guest RTP system. The interaction promoted intersystem crossing and stabilized the triplet excitons, thus helping to achieve strong phosphorescence emission. In addition, the weak intermolecular interaction of halogen bonding is sensitive to external stimuli such as heat, mechanical force, and X-rays. Therefore, the triplet excitons were easily quenched and colorimetric multi-stimuli responsive behaviors were realized, which greatly enriched the luminescence functionality of the RTP materials. This method provides a new platform for the future design of responsive RTP materials based on weak intermolecular interactions between the host and guest molecules.

Halogen Bonding: A New Platform for Achieving Multi‐Stimuli‐Responsive Persistent Phosphorescence