Host-guest structure and tunable multicolor emission in Zn-MOFs via dye encapsulation
Dan Yue1, Yating Wan2, Bowen Qin1
1College of Material Engineering, Henan International Joint Laboratory of Rare Earth Composite Materials, Henan University of Engineering, Zhengzhou 451191, China.
Summary
This study demonstrates tunable multicolor luminescence in anionic metal-organic frameworks (MOFs) by incorporating cationic dyes. The resulting host-guest composites offer controlled emission colors for advanced optical applications.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) possess tunable luminescence properties due to their versatile structures.
- Anionic MOFs, such as Bio-MOF-1-Me, exhibit strong intrinsic ultraviolet fluorescence.
- Achieving multicolor emission from a single MOF platform is a significant challenge.
Purpose of the Study:
- To investigate the potential of anionic MOFs for tunable luminescence.
- To achieve multicolor emission by incorporating cationic dyes into Bio-MOF-1-Me.
- To understand the structural and photophysical mechanisms governing the luminescence of MOF-dye composites.
Main Methods:
- Ion exchange reactions were employed to incorporate cationic dyes (DASEPI, AF) into the anionic MOF (Bio-MOF-1-Me).
- Powder X-ray diffraction (PXRD) and infrared spectroscopy (IR) were used for structural characterization.
- Photoluminescence spectroscopy was utilized to analyze the emission properties of the host-guest composites.
Main Results:
- Structural characterization confirmed the integrity of the MOF framework after ion exchange.
- Dye incorporation was achieved through electrostatic interactions and π-stacking, ensuring uniform dispersion.
- Tunable emission colors (red, green, yellow) were observed under blue light excitation (455 nm) by controlling dye type and loading.
Conclusions:
- Host-guest structural synergy in MOFs enables controlled multicolor luminescence.
- This approach provides a versatile platform for developing advanced luminescent materials.
- The findings open avenues for applications in sensing, imaging, and optoelectronics.
