Mr. Michael Y. Shagam Profile

Michael Y. Shagam

Systems Engineer, Optical Sensors at Cruise LLC

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Proceedings Article | 7 March 2005 Paper

III-nitride LEDs with photonic crystal structures

Jonathan Wierer, Michael Krames, John Epler, Nathan Gardner, Joel Wendt, Mihail Sigalas, Steven Brueck, Dong Li, Michael Shagam

Proceedings Volume 5739, (2005) https://doi.org/10.1117/12.591218

KEYWORDS: Light emitting diodes, Photonic crystals, Metals, Lithography, Aluminum, Semiconducting wafers, Sapphire, Gallium nitride, Etching, Light scattering

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Electrical operation of III-Nitride light emitting diodes (LEDs) with photonic crystal structures is demonstrated. Employing photonic crystal structures in III-Nitride LEDs is a method to increase light extraction efficiency and directionality. The photonic crystal is a triangular lattice formed by dry etching into the III-Nitride LED. A range of lattice constants is considered (a ~ 270 - 340nm). The III-Nitride LED layers include a tunnel junction providing good lateral current spreading without a semi-absorbing metal current spreader as is typically done in conventional III-Nitride LEDs. These photonic crystal III-Nitride LED structures are unique because they allow for carrier recombination and light generation proximal to the photonic crystal (light extraction area) yet displaced from the absorbing metal contact. The photonic crystal Bragg scatters what would have otherwise been guided modes out of the LED, increasing the extraction efficiency. The far-field light radiation patterns are heavily modified compared to the typical III-Nitride LED’s Lambertian output. The photonic crystal affects the light propagation out of the LED surface, and the radiation pattern changes with lattice size. LEDs with photonic crystals are compared to similar III-Nitride LEDs without the photonic crystal in terms of extraction, directionality, and emission spectra.

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