Efficient Circularly Polarized Near-Infrared Luminescence from Zero-Dimensional Hybrid Copper Bromides

Area of Science:

• Materials Science
• Photonics
• Chemistry

Background:

• Circularly polarized luminescence (CPL) offers advanced light manipulation for photonic technologies.
• Chiral hybrid metal halides (HMHs) are emerging as CPL-active materials.
• Achieving high-efficiency near-infrared (NIR) emission with strong CPL is challenging.

Purpose of the Study:

• To develop novel chiral hybrid metal halides for efficient CP-NIR emission.
• To investigate the structure-property relationships in these materials.
• To demonstrate their potential in photonic devices.

Main Methods:

• Synthesis of zero-dimensional hybrid copper bromides with bulky supramolecular cations.
• Characterization of photoluminescence properties, including CPL and quantum yield.
• Fabrication and testing of light-emitting diodes (LEDs).

Main Results:

• Enantiomeric hybrid copper bromides, (18C6@S/R-CHEA)2Cu4Br6, were synthesized.
• Materials exhibited strong CP-NIR emission with >50% photoluminescence quantum yields.
• High dissymmetry factor (up to 6.8 × 10^-2) and distinct CP-NIR signals in LEDs were achieved.

Conclusions:

• The unique supramolecular cations effectively isolate emissive clusters and induce distortions, enhancing CP-NIR emission.
• These materials present a promising platform for efficient CP-NIR light sources.
• The developed materials open opportunities for NIR imaging and secure information technologies.