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http://dx.doi.org/10.3740/MRSK.2019.29.1.59

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

Kim, Sang Mook (Bio-Health Research Center, Korea Photonics Technology Institute)
Kim, Yoon Seok (Department of Nano-Optical Engineering, Korea Polytechnic University)
Publication Information
Korean Journal of Materials Research / v.29, no.1, 2019 , pp. 59-64 More about this Journal
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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