Significant Enhancement of Light Extraction from Light Emitting Diodes with Reverse-Tapered Microholes

The fabrication of InGaN/GaN light emitting diodes with reverse-tapered microholes (RH-LEDs) and their optical —electrical properties were demonstrated. A high light extraction efficiency was realized with the RH-LEDs owing to the diffraction of light and effective extraction of photons caused by th...

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Bibliographic Details
Published inJournal of Light & Visual Environment Vol. 32; no. 2; pp. 124 - 128
Main Authors KANEKO, Toshimitsu, HORINO, Kazuhiko, YAMAMOTO, Hiroshi, ITO, Hiroaki, KURAMATA, Akito
Format Journal Article
LanguageEnglish
Published Tokyo The Illuminating Engineering Institute of Japan 2008
Japan Science and Technology Agency
Subjects
GaN
LED
light extraction
reverse-tapered micro holes
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Summary:The fabrication of InGaN/GaN light emitting diodes with reverse-tapered microholes (RH-LEDs) and their optical —electrical properties were demonstrated. A high light extraction efficiency was realized with the RH-LEDs owing to the diffraction of light and effective extraction of photons caused by the microholes. The estimated light extraction efficiency of the RH-LEDs was as high as 85%; this is 1.5 times higher than that of conventional LEDs having no microholes. The theoretical results were highly consistent with the experimental results.
ISSN:0387-8805
1349-8398
DOI:10.2150/jlve.32.124