ABSTRACT Lanthanide ions are promising for high‐performance circularly polarized luminescence (CPL) materials due to the significant transition magnetoelectric dipole properties. Consequently, controlling the magnetoelectric dipole moments is a key for enhancing their CPL performance. Here, we assembled a chiral europium assembly (Eu 2 assembly) from an Eu(III) complex, which manipulated the structure of complex monomer and modulated the orientation and magnitude of the magnetoelectric dipole moments, leading to a dramatic enhancement in CPL performance. The resulting material exhibits a high quantum yield of 42% (up from 27%) and a luminescence dissymmetry factor of 0.106 and 0.0857, representing a 10‐fold enhancement over the precursor complex (0.0113 and 0.00907). This work not only establishes a clear structure–dipole–performance relationship but also provides a general strategy for developing high‐performance lanthanide‐based CPL materials.
Wang et al. (Fri,) studied this question.