Reversible room-temperature phosphorescence in response to light stimulation based on a photochromic copolymer.

In the field of intelligent luminescence materials, it is a great challenge to regulate organic room-temperature phosphorescence by light irradiation. Herein, benzothiadiazole was modified with viologen derivatives and copolymerized to achieve amorphous RTP emission. The photo-stimulated color change in both emission and absorption has a good reversibility after cycles of light irradiation.