Bridged Aromatic Oxo- and Thioethers with Intense Emission in Solution and the Solid State

Area of Science:

• Materials Science
• Photochemistry
• Solid-State Chemistry

Background:

• Photoluminescent materials are crucial for various applications, including lighting and displays.
• Achieving consistent photoluminescence (PL) across different states (solution vs. solid) is a significant challenge in materials design.

Purpose of the Study:

• To investigate a new class of bridged oxo- and/or thioether compounds as emitters.
• To explore their photoluminescence properties in both fluid solution and solid states.
• To understand factors influencing their emission behavior, such as polymorphism and solvent polarity.

Main Methods:

• Synthesis and characterization of nine bridged oxo- and/or thioether compounds.
• Photophysical property measurements (e.g., photoluminescence quantum yield).
• Quantum chemical calculations for property interpretation.
• X-ray diffraction analysis to study crystal packing.

Main Results:

• Discovery of emitters with nearly identical photoluminescence quantum yields in solution and solid states, a rarely observed phenomenon.
• Demonstration of the influence of polymorphism and solvent polarity on emission characteristics.
• Correlation established between molecular packing in crystals and observed photophysical properties.

Conclusions:

• Bridged oxo- and thioethers represent a promising class of emitters with robust photoluminescence performance.
• The findings offer insights into designing materials with state-independent emission properties.
• Understanding solid-state packing is key to tuning and predicting photoluminescence behavior.