Light-Extraction Enhancement of GaInN Light-Emitting Diodes by Graded-Refractive-Index Indium Tin Oxide Anti-Reflection Contact

GaInN LEDs with a six‐layer graded‐ refractive‐index antireflection coating made entirely of indium tin oxide (ITO) are demonstrated to have 24.3 % higher light output than LEDs with dense ITO coating. The increased light‐output of the LEDs with graded‐refractive‐index antireflection coating is attr...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2008-02, Vol.20 (4), p.801-804
Main Authors: Kim, J. K., Chhajed, S., Schubert, M. F., Schubert, E. F., Fischer, A. J., Crawford, M. H., Cho, J., Kim, H., Sone, C.
Format: Article
Language:English
Subjects:
Antireflection coatings
Indium tin oxide
Light-emitting diodes
Optical coatings
Photochemistry
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Summary:GaInN LEDs with a six‐layer graded‐ refractive‐index antireflection coating made entirely of indium tin oxide (ITO) are demonstrated to have 24.3 % higher light output than LEDs with dense ITO coating. The increased light‐output of the LEDs with graded‐refractive‐index antireflection coating is attributed to the virtual elimination of Fresnel reflection and surface roughening of low‐refractive index ITO.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.200701015