Optimized Photoemission from Organic Molecules in 2D Layered Halide Perovskites.

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photophysics

Background:

• Hybrid organic-inorganic metal halides are key in materials research, with properties often derived from inorganic components.
• Organic units typically enhance stability and processability, but rarely dominate functional properties.

Purpose of the Study:

• To design and synthesize novel hybrid materials where photophysical properties originate from organic structural units.
• To investigate the potential of these materials for applications requiring efficient light emission.

Main Methods:

• Synthesis and characterization of two new hybrid compounds: (C15H16N)2CdCl4 and ((Br)C15H15N)2CdCl4.
• Optical spectroscopy and density functional theory (DFT) studies to confirm the origin of photoemission.
• Measurement of photoluminescence quantum yield (PLQY) and assessment of environmental and thermal stability.

Main Results:

• The synthesized compounds possess 2D layered Ruddlesden-Popper-type perovskite structures.
• Photoemission was confirmed to originate from the trans-stilbene organic cations.
• Achieved high PLQY values of 50.83% and 26.60%, representing a significant increase compared to the precursor organic salt (10.33%).

Conclusions:

• Hybrid metal halides can be engineered for efficient photoemission originating from organic components.
• The developed materials demonstrate excellent optical properties and stability, suitable for radiation detection and fast scintillation.
• This research opens new avenues for designing functional hybrid materials with tailored optoelectronic properties.