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

Sang Mook Kim; Yoon Seok Kim

doi:10.3740/MRSK.2019.29.1.59

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2019 Vol.29, Issue 1 Preview Page

Optical Characterization of Light-Emitting Diodes Grown on the Cylinder Shape 300 nm Diameter Patterned Sapphire Substrate 300 nm Diameter Cylinder-Shape 나노패턴 기판을 이용한 LEDs의 광학적 특성

January 2019. pp. 59-64

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Abstract

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.

Keywords

nano PSS

micro PSS

cylinder shape PSS

top and bottom side LIV measurement

flip chip LEDs

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 29
No :1
Pages :59-64
Received Date : 2018-12-15
Revised Date : 2018-12-24
Accepted Date : 2018-12-26
DOI :https://doi.org/10.3740/MRSK.2019.29.1.59

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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