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Enantiomorphic Perovskite Ferroelectrics with Circularly Polarized Luminescence
Ji-Xing Gao1, Wan-Ying Zhang1, Zheng-Guang Wu2
1Institute for Science and Applications of Molecular Ferroelectrics, Zhejiang Normal University, Jinhua 321004, People's Republic of China.
Journal of the American Chemical Society
|February 25, 2020
Summary
Researchers developed the first chiral ferroelectric materials exhibiting circularly polarized luminescence (CPL). These novel organic-inorganic perovskites open doors for advanced optoelectronic devices and molecular switches.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Materials with circularly polarized luminescence (CPL) are crucial for advanced applications.
- Achiral luminophore structures limit the practical use of CPL materials.
- Molecular ferroelectrics offer tunable properties for CPL material assembly.
Purpose of the Study:
- To synthesize and characterize novel enantiomorphic ferroelectric materials with CPL activity.
- To investigate the ferroelectric and optical properties of these new materials.
- To explore the potential of chiral ferroelectrics in optoelectronics.
Main Methods:
- Single-crystal X-ray diffraction to confirm mirror relationships.
- Vibrational circular dichroism (VCD) spectroscopy.
- CPL spectroscopy to measure Cotton effect and mirror CPL activity.
Main Results:
- Successfully synthesized (R)- and (S)-3-(fluoropyrrolidinium)MnBr3 organic-inorganic perovskites.
- Observed a 222F2-type ferroelectric phase transition at 273 K.
- Confirmed mirror symmetry and captured mirror CPL activity attributed to chiral organic components.
Conclusions:
- This work reports the first molecular ferroelectric exhibiting CPL activity.
- The findings establish a new class of chiral ferroelectric materials with CPL properties.
- This research paves the way for novel optoelectronic devices and spintronic applications.
