Abnormal Chiral Coupling for Efficient and Stable Reduced-Dimensional Perovskite Emitters.

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Chemistry

Background:

• Reduced-dimensional halide perovskites (RDPs) are crucial for optoexcitonic devices.
• Achieving high luminescence efficiency, stability, and phase purity simultaneously remains a challenge.
• Existing methods often rely on external passivators, limiting intrinsic material improvements.

Purpose of the Study:

• To introduce a novel design principle for RDP emitters.
• To enhance luminescence efficiency, stability, and phase purity without external passivators.
• To investigate the role of chiral coupling in RDPs.

Main Methods:

• Incorporation of chiral benzene halide RDPs.
• Construction of nanoscale lattices and long-range superstructures.
• Analysis of defect reduction, exciton-phonon scattering, and excited-state transfer.

Main Results:

• An abnormal chiral coupling effect was observed.
• Phase purity improved, defects reduced, and exciton-phonon scattering weakened.
• Photoluminescence quantum yield increased by over 35% compared to achiral counterparts.
• Stable, low-threshold continuous-wave lasing was achieved for over 0.5 hours at room temperature.

Conclusions:

• Chiral coupling is an effective strategy for enhancing RDP performance.
• This approach offers a new design principle for defect control, phase purity, and microstructure.
• Enables development of highly efficient and stable perovskite optoexcitonic devices.