6‐1: Distinguished Paper and Invited Paper: Design Strategies for Materials Showing Thermally Activated Delayed Fluorescence and Beyond: Towards the Fourth‐generation OLED Mechanism.

Design strategies for TADF molecules are discussed and a new emitter concept based on an almost “zero‐energy‐gap” is developed. Thermal activation is not substantial. Applied in an OLED, all singlet and triplet excitons are harvested directly in the lowest singlet state without time‐delaying TADF. This landmarking mechanism, being beyond TADF, leads to emission decay times in the sub‐µs range. [ABSTRACT FROM AUTHOR]