TY - JOUR
T1 - Enhanced light extraction mechanism of GaN-based light-emitting diodes using top surface and side-wall nanorod arrays
AU - Lin, Chih Chien
AU - Lee, Ching Ting
N1 - Funding Information:
Manuscript received January 27, 2010; revised April 29, 2010; accepted May 08, 2010. Date of publication May 24, 2010; date of current version July 09, 2010. This work was supported by the National Science Council of Taiwan, by the landmark project, Advanced Optoelectronic Technology Center, and by the Center for Micro/Nano Science and Technology of National Cheng Kung University.
PY - 2010
Y1 - 2010
N2 - Using a self-catalyst vaporliquidsolid mechanism, random indiumtinoxide (ITO) nanorod arrays were deposited on the top surface and side-wall of GaN-based light-emitting diodes (LEDs) by electron-beam deposition. When the side-wall nanorod arrays and the top surface ITO nanorod arrays were deposited at an oblique-angle of 45°, roughened surface morphology and matched refractive index of 1.6 between air and the p-GaN layer could be obtained. Comparing the conventional LEDs without ITO nanorod arrays, a 34% light output power increase was attributed to the roughened top and side-wall surface morphology and the matched refractive index caused by the ITO nanorod arrays. Not only were the side-wall nanorod arrays used to increase light output power, but the light output divergence angle could be widened by using side-wall nanorod arrays.
AB - Using a self-catalyst vaporliquidsolid mechanism, random indiumtinoxide (ITO) nanorod arrays were deposited on the top surface and side-wall of GaN-based light-emitting diodes (LEDs) by electron-beam deposition. When the side-wall nanorod arrays and the top surface ITO nanorod arrays were deposited at an oblique-angle of 45°, roughened surface morphology and matched refractive index of 1.6 between air and the p-GaN layer could be obtained. Comparing the conventional LEDs without ITO nanorod arrays, a 34% light output power increase was attributed to the roughened top and side-wall surface morphology and the matched refractive index caused by the ITO nanorod arrays. Not only were the side-wall nanorod arrays used to increase light output power, but the light output divergence angle could be widened by using side-wall nanorod arrays.
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U2 - 10.1109/LPT.2010.2050582
DO - 10.1109/LPT.2010.2050582
M3 - Article
AN - SCOPUS:77954603695
SN - 1041-1135
VL - 22
SP - 1132
EP - 1134
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 15
M1 - 5471200
ER -