Light extraction in planar light-emitting diode with nonuniform current injection: model and simulation.

Area of Science:

• Optoelectronics
• Photonics
• Semiconductor Devices

Background:

• Light-emitting diodes (LEDs) often feature patterned metal electrodes to enhance light extraction.
• Nonuniform current injection is a characteristic of such LEDs, impacting optical performance.
• Accurate simulation of light extraction is crucial for optimizing LED design.

Purpose of the Study:

• To develop an analytical and numerical model for simulating light extraction in LEDs with nonuniform current injection.
• To evaluate the impact of electrode mesh pitch on light output power and spatial distribution.
• To provide an efficient tool for assessing the optical performance of LEDs with patterned electrodes.

Main Methods:

• A bi-plane computation domain model was developed.
• The light-generating layer was represented by an ensemble of point light sources.
• Numerical photon collection and angle-tuned aperture functions were employed.
• Simulations were performed for various mesh pitches of the top metal electrode.

Main Results:

• The model successfully simulated spatial distributions of output optical power.
• Total output power was predicted for different mesh configurations.
• The simulation strategy demonstrated efficiency in evaluating optical performance.
• Key parameters influencing light extraction were identified.

Conclusions:

• The developed model and simulation strategy are effective for LEDs with nonuniform current injection.
• This approach is highly efficient for evaluating optical performance of LEDs with periodical or symmetrical electrode configurations.
• The findings can guide the design of improved LED structures for enhanced light extraction.