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Light‐Extraction Enhancement of GaInN Light‐Emitting Diodes by Graded‐Refractive‐Index Indium Tin Oxide Anti‐Reflection Contact
Author(s) -
Kim J. K.,
Chhajed S.,
Schubert M. F.,
Schubert E. F.,
Fischer A. J.,
Crawford M. H.,
Cho J.,
Kim H.,
Sone C.
Publication year - 2008
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200701015
Subject(s) - materials science , light emitting diode , refractive index , indium tin oxide , optoelectronics , coating , high refractive index polymer , anti reflective coating , optics , fresnel equations , layer (electronics) , indium , diode , oxide , composite material , metallurgy , physics
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.