Tuning the Energetics of Carbonyl-Bridged Triarylamines: From Thermally Activated Delayed Fluorescence to Anti-Kasha Dual-Emission and Room Temperature Phosphorus Materials

Abstract

The first example of tuning the energetics of thermally activated delayed fluorescence (TADF) molecules to access anti-Kasha dual-emission and room-temperature phosphorescence materials through a strategy for structural modification is developed here. To rapidly construct a library of structurally diverse carbonyl-bridged triarylamines-based TADF materials, the copper-mediated cyclization of heterocycle and 2-bromobenzoic acids was further developed for the first time. The novel anti-Kasha dual-emission materials exhibit distinct white light emission with a CIE coordinate of (0.32, 0.32) in the solid film, which could be fabricated as low-cost and robust organic white LEDs. The ultralong room temperature organic phosphorus (URTP) materials displayed cyan afterglow for up to seven seconds with a lifetime of 508.8 ms and could be used in encryption.