Phosphorus Heterocycles for Electroluminescence

Phosphorus‐containing heterocyclic compounds exhibit significant potential for applications in electroluminescence, owing to their distinctive electronic structures and varied chemical properties. Phosphorus heterocycles serve multifunctional roles within organic light‐emitting diodes (OLEDs), including as emitters, host matrices, and electron and hole blocking layers, contributing to enhanced device performance. Their intrinsic structural characteristics confer key advantages, including superior thermal stability, high fluorescence quantum yields, and suitable energy level alignment, all of which are essential for optimizing electroluminescent (EL) efficiency. Herein, the recent progress of EL phosphorus‐containing heterocyclics materials is overviewed and their structure–property relationships, which would provide insights into expanding the applicability of OLEDs is discussed.