Synaptic Plasticity Powering Long-Afterglow Organic Light-Emitting Transistors

Area of Science:

• Optoelectronics
• Materials Science
• Organic Electronics

Background:

• Long-lasting luminescence is crucial for optical data storage and display technologies.
• Organic light-emitting diodes utilize long-afterglow materials, but this approach is underexplored in light-emitting transistors.
• Light-emitting transistors (LETs) remain largely unexplored with unproven technological potential.

Purpose of the Study:

• To fabricate novel long-afterglow organic light-emitting transistors (LAOLETs).
• To demonstrate a new operational strategy for persistent electroluminescence in LETs.
• To explore the potential of LAOLETs in visual UV sensing applications.

Main Methods:

• Fabrication of LAOLETs utilizing an indium-gallium-zinc-oxide (IGZO) semiconducting channel.
• Exploitation of a photoinduced synaptic effect within the IGZO layer.
• Inducing oxygen vacancies in IGZO via 312 nm irradiation to increase channel conductance.

Main Results:

• LAOLETs demonstrated persistent electroluminescence lasting hundreds of seconds post-UV irradiation.
• The long emission is attributed to slow recombination kinetics of photogenerated electrons with oxygen vacancies.
• Integrated LAOLET arrays functioned as visual UV sensors with long-lifetime green emission in irradiated areas.

Conclusions:

• A novel strategy for achieving long-lasting luminescence in LETs has been successfully demonstrated.
• The photoinduced synaptic effect in IGZO enables persistent electroluminescence, paving the way for advanced optoelectronic devices.
• LAOLETs show promise for applications in optical data storage, display technology, and UV sensing.