Two-dimensional organic-inorganic molecular cocrystal

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Molecular cocrystal engineering offers a route to novel functionalities in photonics and optoelectronics.
• The synthesis of two-dimensional (2D) organic-inorganic molecular cocrystals (OIMCs) remains a significant challenge.
• Existing 2D cocrystals are primarily organic, limiting the scope of OIMC applications.

Purpose of the Study:

• To achieve the first self-assembly of a 2D OIMC composed of C60 and P4S3.
• To investigate the structural, photophysical, and optical properties of the novel C60·2P4S3 cocrystal.
• To explore the potential of OIMCs in optoelectronic applications.

Main Methods:

• Cocrystal synthesis via self-assembly.
• Structural characterization using X-ray diffraction.
• Photoluminescence spectroscopy to determine emission efficiency.
• Optical waveguide characterization to assess anisotropy.

Main Results:

• Successfully synthesized the 2D OIMC C60·2P4S3 with a stable layered structure.
• Observed efficient light emission (quantum yield of 13.24%) attributed to C-P contacts suppressing non-radiative transitions.
• Demonstrated asymmetric optical waveguides with a high anisotropic ratio (3.625) due to vibrational transition anisotropy.

Conclusions:

• The C60·2P4S3 2D OIMC represents a breakthrough in cocrystal engineering.
• Strong C-P interactions are crucial for enhanced photoluminescence in OIMCs.
• The anisotropic optical properties open avenues for advanced optoelectronic devices.