Annulated oxazolium salts as anion-π + interaction-enabled solid-state room-temperature phosphorescent materials

Abstract

Efficient counter-anion exchange represents a powerful and straightforward approach for modulating the photophysical properties of ionic luminescent materials without structural modification. Herein, we report how fluorescent annulated oxazolium salts switched to room-temperature phosphorescent materials upon counter-anion exchange of hexafluorophosphate (PF6-) with iodide (I-).