Recent advances in circularly polarized luminescence (CPL) of chiral boron difluoride complexes

Circularly polarized luminescence (CPL) has emerged as an intriguing photophysical phenomenon with potential applications in optoelectronics, bioimaging and anti-counterfeiting materials. Among various CPL-active molecules, chiral boron difluoride complexes have attracted considerable attention due to their structural versatility, tunable emission properties and high luminescence efficiencies. This review summarizes recent progress in the design, synthesis, and photophysical properties of chiral boron difluoride complexes exhibiting CPL. We highlight key structural motifs, including boron-dipyrromethenes (BODIPYs), boron β-diketonates and boranils that have been successfully employed to induce efficient CPL activity. Moreover, we discuss the relationships between molecular structure and CPL performance, the mechanisms underlying CPL generation, and emerging strategies to improve emission efficiency and chiroptical properties. Finally, future perspectives are outlined with an emphasis on the challenges and opportunities in developing next-generation CPL-active materials based on boron difluoride frameworks.