ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Using TracePro® Monte-Carlo ray-tracing simulations, this paper investigates theimproved light extraction efficiency (LEE) obtained by patterning the surface and/or substrate ofGaN LEDs with unique three-dimensional micro-cavity patterns. The simulations commence byconsidering the case of a sapphire-based GaN LED. The effects on the LEE of the micro-cavitydimensions, the absorption coefficient of the active layer, the point source location, and the chipdimensions are systematically examined. Subsequently, the LEE performance of the sapphire-basedGaN LED is compared with that of a thin-GaN LED for various surface texturing strategies. Ingeneral, the results show that patterning either the surface or the substrate of the LED structureprovides an effective improvement in the LEE of both the sapphire-based GaN LED and the thin-GaN LED. For both LED structures, the maximum LEE enhancement is obtained by patterning boththe upper surface of the LED and the substrate surface. However, the simulation results indicate thatthe improvement obtained in the LEE is the result primarily of pattering the upper surface of theLED
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.98.pdf
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