Bifacial Color-Tunable Electroluminescent Devices.

Area of Science:

• Materials Science
• Optoelectronics
• Device Physics

Background:

• Alternate current electroluminescent (ACEL) devices offer advantages like large-area processability and flexibility compared to other light-emitting technologies.
• Achieving color tunability and white light emission is crucial for expanding ACEL applications.

Purpose of the Study:

• To develop a novel ACEL device architecture for color tunability and white light emission.
• To enable independent control of stacked ACEL subdevices for versatile light output.

Main Methods:

• Fabrication of a three-terminal device with two monolithically stacked ACEL subdevices (e.g., orange and blue).
• Utilized semitransparent silver nanowire networks for bottom and top electrodes, enabling bifacial emission.
• Performed detailed optical loss analysis on single and tandem ACEL devices.

Main Results:

• Demonstrated color tunability through independent operation of stacked ACEL subdevices.
• Achieved bifacial Janus-type emission due to the semitransparent electrodes.
• Quantified optical loss mechanisms in both single and tandem device configurations.

Conclusions:

• The novel tandem ACEL device architecture successfully enables color tunability and white light emission.
• The bifacial emission capability broadens the potential use cases for ACEL technology.
• This advancement opens new possibilities for ACEL applications in signage and lighting industries.