Fluorescent Aromatic Polyether Sulfones: Processable, Scalable, Efficient, and Stable Polymer Emitters and Their...

Area of Science:

• Materials Science
• Polymer Chemistry
• Organic Electronics

Background:

• Development of novel semiconducting polymers is crucial for advanced electronic applications.
• Polyether sulfones offer a promising backbone for functional materials.
• Tuning optical properties of polymers is key for light-emitting diode (LED) applications.

Purpose of the Study:

• To synthesize fully aromatic polyether sulfones with tunable π-conjugated semiconducting units.
• To investigate the structural, optical, and electronic properties of these novel polymers.
• To demonstrate their application in organic light-emitting diode (OLED) devices.

Main Methods:

• Copolymerization of carbazole-, anthracene-, and benzothiadiazole-based fluorophores with diphenylsulfone and diphenylpyridine moieties.
• Characterization of molecular weight, thermal stability, solubility, and optoelectronic properties.
• Fabrication and testing of polymer light-emitting diode (PLED) devices using the synthesized polymers in the emitting layer (EML).

Main Results:

• High molecular weight (up to 70 kDa) fluorescent polyarylethers with excellent solubility and thermal stability were developed.
• Tunable emission colors from blue to yellow and white light were achieved by altering comonomer type and ratio.
• Selected copolymers demonstrated successful application in OLED devices on rigid and flexible substrates, exhibiting remarkable color stability up to 15 V bias voltage.
• Scalable synthesis of up to 25 g of high-molecular-weight polymers was achieved.

Conclusions:

• A versatile methodology for synthesizing semiconducting polyethersulfones for PLEDs was established.
• The developed polymers are suitable for printable and flexible emitting layers (EMLs) for large-area PLED applications.
• The approach provides a straightforward tool for producing luminescent polymers with tailored properties.