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Making micro-LED technology better is a big task for engineers and designers. They need to carefully figure out and improve how light works inside the many layers of these devices. Stack simulation emerges as an indispensable tool, facilitating precise analysis and characterization of each layer's optical properties and their collective impact on the device's performance. This technical guide explores the process and benefits of employing stack simulation for micro-LED advancement.

Technical Foundations of Stack Simulation

Stack simulation adopts a comprehensive computational strategy to model light behavior within the micro-LED's layered architecture. By employing tools like the STACK Optical Solver within FDTD Solutions, professionals can simulate the electromagnetic field's interaction with each layer, yielding insights into:

Optical Layer Construction: This involves defining the geometric and material properties of each layer to accurately model the micro-LED structure.

Material Property Extraction: Leveraging the material database to assign correct optical properties to each layer ensures realistic simulation outcomes.

Planar Emission Analysis: The simulation calculates the light emission characteristics across the device, including angular distribution and wavelength-specific behavior, critical for device optimization.

Insights Gained from Stack Simulation

The data derived from stack simulation is invaluable for advancing micro-LED performance, offering insights into:

Purcell Factor: The Purcell factor, F, enhances spontaneous emission and is vital for optimizing light emission. The factor is dimensionless and quantifies the ratio of the total power emitted by the dipole to the power it would emit in a homogeneous medium. 


Radiance and Luminance: These metrics are crucial for assessing the device's optical efficiency. Radiance (W/sr·m²) aids in understanding light propagation through the micro-LED layers, while luminance (cd/m²) relates to perceived brightness, informing design for improved visual performance.

Tristimulus Values: Representing the basis vectors of the CIE 1931 color space, these values quantify the color a human eye perceives from a light source, vital for achieving accurate color representation in devices.


Leveraging Simulation for Micro-LED Innovation

The technical insights from stack simulation are essential for the iterative design process, enabling precise adjustments that significantly enhance micro-LED performance. By accurately modeling the optical behavior of multilayer structures, engineers can drive forward the capabilities of micro-LED technology across various applications.

Check out our YouTube video to see how we're making micro-LEDs even better with stack simulation. 


Conclusion: Illuminating the Path to Advanced Micro-LEDs

Stack simulation stands as a cornerstone in developing next-generation micro-LED technology. Through comprehensive analysis and optimization of the micro-LED's multilayer structure, this approach not only accelerates the design process but also fosters innovation, guiding the industry toward more efficient, brighter, and color-accurate devices. As we continue to explore the potential of micro-LEDs, stack simulation will play a critical role in illuminating the path to advanced lighting and display solutions.

Post by Majid Ebnali Heidari
March 19, 2024