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Efficient optimization method for the light extraction from periodically modulated LEDs using reciprocity.

O T A Janssen¹, A J H Wachters, H P Urbach

¹Optics Group, Delft University of Technology, Delft, The Netherlands. o.t.a.janssen@tudelft.nl

|December 18, 2010

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Researchers optimized Light Emitting Diodes (LEDs) using the reciprocity method. This novel approach doubled the light extraction efficiency compared to standard flat designs, offering a significant improvement for LED performance.

Area of Science:

Optoelectronics
Photonics
Materials Science

Background:

Incoherent emission from Light Emitting Diodes (LEDs) is crucial for device performance.
Current methods for calculating emission can be computationally intensive.
Optimizing LED structures is key to enhancing light extraction efficiency.

Purpose of the Study:

To introduce an efficient computational method for calculating incoherent emission from periodically structured LEDs.
To demonstrate the application of the reciprocity principle for optimizing LED structures.
To improve the light extraction efficiency of LEDs through structural optimization.

Main Methods:

Utilized the reciprocity method to compute incoherent emission from LEDs.
Applied a further iteration of the reciprocity principle to optimize LED structure.

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Focused on optimizing one-dimensional grating structures.

Main Results:

The reciprocity method allows for low-cost computation of LED emission.
Optimized one-dimensional grating structures show significantly enhanced emission.
Achieved twice the extraction efficiency compared to optimized flat LED structures.

Conclusions:

The reciprocity method is an effective tool for both analyzing and optimizing LED emission.
Periodically structured LEDs, particularly optimized gratings, offer superior light extraction efficiency.
This work provides a pathway for designing more efficient Light Emitting Diodes.