Sided Patterned Sapphire Substrate to Improve Research Performance of Light-Emitting Diodes

There have been many studies regarding increased LED efficiency. The patterned sapphire substrate (PSS) method has been reported to not only improve light extraction efficiency but also increase the internal light efficiency through a low dislocation effect when growing an epitaxial layer growth on the top of the sapphire substrate.3–6 However, these studies are mostly based on lab experiments that are used to show if the efficiency is increased compared to the existing LEDs, which means the quantitative results are somewhat lacking. In order to quantitatively analyze the efficiency improvement from a PSS design, an LED has to pass through many processes. However, there have been studies that quantitatively analyze the improvement of light extraction efficiency through a PSS design in order to develop low cost high intensity LEDs.

This study proposes a new structure that utilizes double-sided patterns on the sapphire substrate in order to increase the light extraction efficiency and heat dissipation efficiency. A Light Tools 7.0 simulation program applying Monte Carlo Method based ray tracing was used to quantitatively analyze the light extraction efficiency of the PSS and to design the pattern. A COMSOL heat transfer simulation was used to analyze the improvement in the heat dissipation efficiency. The designed pattern was applied using a nano imprint lithography (NIL) method to create the pattern on the sapphire substrate used to fabricate and evaluate the actual LED sample.


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