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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.1 pp.59-64

Optical Characterization of Light-Emitting Diodes Grown on the Cylinder Shape 300 nm Diameter Patterned Sapphire Substrate

Sang Mook Kim1†, Yoon Seok Kim2†
1Bio-Health Research Center, Korea Photonics Technology Institute, 9, Cheomdan Venture-ro 108 beon-gil, Buk-gu, Gwangju 61007, Republic of Korea
2Department of Nano-Optical Engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, Gyeonggi-do 15073, Republic of Korea
Corresponding author
E-Mail : (S. M. Kim, KOPTI), (Y. S. Kim, KPU)


This study investigates the optical characteristics of InGaN multiple quantum wells(MQWs) light emitting diodes(LEDs) on planar sapphire substrates(PSSs), nano-sized PSS(NPSS) and micro-sized PSS(MPSS). We obtain the results as the patterning size of the sapphire substrates approach the nanometer scale: The light from the back side of the device increases and the total light extraction becomes larger than the MPSS- and planar-LEDs. The experiment is conducted by Monte Carlo ray-tracing, which is regarded as one of the most suitable ways to simulate light propagation in LEDs. The results show fine consistency between simulation and measurement of the samples with different sized patterned substrates. Notably, light from the back side becomes larger in the NPSS LEDs. We strongly propose that the increase in the light intensity of NPSS LEDs is due to an abnormal optical distribution, which indicates an increase of extraction probability through NPSS.

300 nm Diameter Cylinder-Shape 나노패턴 기판을 이용한 LEDs의 광학적 특성

김상묵1†, 김윤석2†
1한국광기술원 바이오-헬스연구센터,2한국산업기술대학교 나노-광공학과