Twisted-stacking MOF patterns with tailorable circularly polarized luminescence properties and encryption...

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Optical active metal-organic frameworks (MOFs) show promise for circularly polarized luminescence (CPL).
• Limited luminescence dissymmetry factors (g_lum) and lack of patterning hinder practical applications of MOFs.
• Developing MOFs with high g_lum and patterning capabilities is crucial for advanced optical devices.

Purpose of the Study:

• To design and fabricate twisted-stacking MOF patterns with high g_lum and tailorable CPL performance.
• To overcome the limitations of small g_lum and lack of patterning in existing optical active MOFs.
• To enable the development of miniaturized chiroptical devices, information encryption, and storage.

Main Methods:

• Utilized brush coating, bottom-up heteroepitaxial growth, and twisted-stacking techniques.
• Created two-dimensional (2D) programmable patterns of highly oriented MOF films using pre-aligned Cu(OH)₂ nanowire (NW) templates.
• Functionalized MOF patterns with fluorescent dyes and deposited a second oriented MOF layer as a phase retarder.

Main Results:

• Achieved high luminescence dissymmetry factors (g_lum) of approximately 0.4 in the twisted-stacking MOF patterns.
• Demonstrated tailorable CPL performance within the fabricated MOF patterns.
• Successfully generated chiroptical responses in programmable MOF patterns.

Conclusions:

• The developed strategy enables the fabrication of arbitrary, programmable optical active MOF patterns with enhanced g_lum.
• Precise regulation of CPL performance within MOF patterns is achievable.
• This approach facilitates the implementation of miniaturized chiroptical devices and advanced information storage solutions.