Numerical Simulations of the Light-Extraction Efficiency of LEDs on Sapphire Substrates Patterned with Various Polygonal Pyramids

Title
Numerical Simulations of the Light-Extraction Efficiency of LEDs on Sapphire Substrates Patterned with Various Polygonal Pyramids
Author(s)
박시현최호
Keywords
EMITTING-DIODES; IMPROVEMENT; TEXTURE
Issue Date
201412
Publisher
OPTICAL SOC KOREA
Citation
JOURNAL OF THE OPTICAL SOCIETY OF KOREA, v.18, no.6, pp.772 - 776
Abstract
We report a numerical analysis of the light-extraction efficiency (LEE) of light-emitting diodes (LEDs) on patterned sapphire substrates (PSSs). We considered various n-sided, regular convex pyramids, where n is an integer and n >= 3. We then considered four cross sections: extruded, subtracted, truncated-extruded, and truncated-subtracted. Ray-tracing simulations were carried out with these polygonal pyramid patterns, and the dimensions of the patterns were systematically varied. Optimized pattern shapes were determined for large LEE. An extruded circular pyramid with a slant angle of 45 degrees was found to be the optimal patterned shape.
URI
http://hdl.handle.net/YU.REPOSITORY/30356http://dx.doi.org/10.3807/JOSK.2014.18.6.772
ISSN
1226-4776
Appears in Collections:
공과대학 > 전자공학과 > Articles
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