Intramolecular through-space heavy-atom effect in π-stacked MR-TADF emitters

In this issue of Chem, Jiang and colleagues utilized a spiro-fluorene unit as a π-bridge to construct a series of π-stacked multi-resonance thermally activated delayed fluorescence emitters. By introducing different heavy atoms through chemical bonding, they revealed the impact of the intramolecular through-space heavy-atom effect on the optoelectronic properties of the molecules.