Non-doped solid-state white light-emitting electrochemical cells employing the microcavity effect

Area of Science:

• Solid-state lighting
• Organic electronics
• Electroluminescent devices

Background:

• Light-emitting electrochemical cells (LECs) offer advantages like simple structure, low voltage, and solution processability.
• Achieving efficient white electroluminescence (EL) in non-doped LECs remains a research challenge.
• Microcavity effects can influence emission characteristics in thin-film devices.

Purpose of the Study:

• To demonstrate a straightforward method for generating white EL from non-doped LECs.
• To leverage microcavity effects for enhancing specific emission colors.
• To achieve high efficiency in solution-processed white LECs.

Main Methods:

• Fabrication of non-doped LECs utilizing a blue-emitting complex.
• Tuning emissive layer thickness to control the recombination zone.
• Utilizing microcavity effects to introduce red emission components.

Main Results:

• Successful generation of white electroluminescence (EL) by combining blue emission and microcavity-enhanced red emission.
• Achieved external quantum efficiencies up to 5% and power efficiencies of 12 lm W⁻¹.
• Demonstrated that simple non-doped LECs can produce efficient white EL.

Conclusions:

• A simple, non-doped approach can yield efficient white electroluminescence in LECs.
• Microcavity effects are a viable strategy to enhance emission and achieve white light.
• These findings contribute to the development of practical solid-state lighting solutions.