A Simple Molecular Design Strategy for Delayed Fluorescence toward 1000 nm

Area of Science:

• Optoelectronics and Materials Science
• Organic Electronics

Background:

• Near-infrared (NIR) light is crucial for photovoltaics, telecommunications, and biomedical applications.
• Thermally activated delayed fluorescence (TADF) materials offer intense luminescence but struggle with NIR emission due to challenges in achieving strong donor-acceptor interactions and narrow energy gaps (ΔE_ST).

Purpose of the Study:

• To develop novel TADF materials for efficient NIR emission.
• To overcome the limitations of existing TADF emitters in the NIR region.

Main Methods:

• Designed a donor-acceptor (D-A) dyad structure, moving away from the conventional polydonor model.
• Synthesized and characterized new TADF emitters.

Main Results:

• Achieved photoluminescence (PL) close to 1000 nm with the D-A dyad structure.
• Reported electroluminescence (EL) at a peak wavelength of 904 nm.
• Demonstrated a strong D-A interaction suitable for NIR TADF.

Conclusions:

• The D-A dyad strategy is effective for creating NIR TADF emitters.
• This approach offers a simple and versatile method for developing future NIR TADF materials.
• The developed materials have potential applications in NIR optoelectronics and beyond.