Chiral Spiro‐Type Dual‐Emission Emitters for Single‐Molecule Circularly Polarized White OLEDs

Multi‐component emitters are widely used in circularly polarized white organic light‐emitting diodes (CP‐WOLEDs) but often suffer from poor color stability and complex fabrication. Single‐molecule white emitters offer a promising alternative, yet existing systems are typically limited by aggregation‐caused quenching and unbalanced emission. Herein, we report spiro‐based chiral dual‐emissive emitters, ( R/S )‐SX‐PTZ , constructed by integrating rigid spiro acceptor with conformationally flexible phenothiazine donors. This design allows distinct conformers to generate complementary blue and yellow emissions, achieving single‐molecule white emission (CIE 0.33, 0.34). The spiro scaffold effectively suppress intermolecular interactions, endowing the system with aggregation‐induced emission (AIE) and high photoluminescence quantum yields (PLQY) of 95% in crystalline state. Moreover, the enantiomers exhibit mirror‐image circularly polarized signals with | g lum | = 2.2 × 10 −3 . Notably, the | g lum | value is substantially amplified to 1.1 × 10 −2 upon dispersing the SX‐PTZ in polydimethylsiloxane (PDMS) matrix, attributed to the induced supramolecular ordering. Furthermore, the CP‐WOLEDs incorporating ( R/S )‐SX‐PTZ deliver stable warm‐white electroluminescence with EQE max of 5.0% and CRI of 74. This work establishes a conformationally engineered chiral spiro‐platform for efficient single‐molecule white CPEL, providing new insights into the design of high‐performance chiral optoelectronic materials.