Boronate- and borinate-based π-systems for blue thermally activated delayed fluorescence materials

Area of Science:

• Organic Chemistry
• Materials Science
• Photophysics

Background:

• Thermally activated delayed fluorescence (TADF) is a crucial mechanism for achieving high efficiency in organic light-emitting diodes (OLEDs).
• Electron-accepting units are essential for designing TADF molecules with tailored electronic properties.

Purpose of the Study:

• To design and synthesize novel TADF molecules incorporating boronate-ester, borinate-ester, and thioester moieties as electron-accepting units.
• To investigate the electroluminescent properties of these newly synthesized molecules in OLED devices.

Main Methods:

• Chemical synthesis of TADF molecules featuring different boron-containing ester functionalities.
• Fabrication and characterization of OLED devices using the synthesized molecules as emitters.
• Analysis of electroluminescence spectra and CIE chromaticity coordinates.

Main Results:

• Successful synthesis of TADF molecules with boronate-ester, borinate-ester, and thioester electron-accepting units.
• OLED devices incorporating a borinate-ester-based emitter demonstrated efficient blue electroluminescence.
• The blue emission was characterized by CIE chromaticity coordinates of (0.15, 0.15).

Conclusions:

• Borinate-ester moieties are effective electron-accepting units for developing high-performance TADF emitters.
• The developed TADF molecules show promise for applications in blue organic light-emitting diodes.
• This work contributes to the advancement of molecular design strategies for efficient OLEDs.