Unraveling the Configuration Modulation in Spiro-Based Through-Space Charge Transfer Materials

Area of Science:

• Materials Science
• Organic Electronics
• Photophysics

Background:

• Thermally activated delayed fluorescence (TADF) materials are crucial for efficient optoelectronic devices.
• Through-space charge transfer (TSCT) systems offer a promising design strategy for TADF materials.
• Understanding the link between molecular structure and TSCT properties is essential for performance optimization.

Purpose of the Study:

• To investigate how spatial configuration influences TSCT characteristics and triplet excited state properties.
• To explore the impact of manipulating donor-acceptor segment arrangements on TADF behavior.
• To guide the development of advanced TSCT materials for improved optoelectronic applications.

Main Methods:

• Synthesis of a series of TSCT materials (DMB2-DMB5) with varied spatial arrangements using spiro skeletons.
• Characterization of TADF properties and electronic features of the synthesized compounds.
• Correlation of molecular configuration with observed optoelectronic performance, including external quantum efficiency.

Main Results:

• Synthesized TSCT materials exhibited diverse TADF characteristics based on their spatial arrangements.
• External quantum efficiency varied significantly, ranging from 3.6% to 28.0%, demonstrating the effect of configuration.
• Spatial arrangement, not just distance, critically influences TSCT properties when donor and acceptor units are proximate.

Conclusions:

• Molecular spatial configuration is a key determinant of TSCT properties and TADF performance.
• Strategic manipulation of spatial arrangements provides a pathway to design high-efficiency TADF materials.
• This study offers valuable insights for advancing the design and application of TSCT-based optoelectronic systems.