Design and fabrication of high-index-contrast self-assembled texture for light extraction enhancement in LEDs
Citations Over TimeTop 17% of 2011 papers
Abstract
We developed a high-index-contrast photonic structure for improving the light extraction efficiency of light-emitting diodes (LEDs) by a self-assembly approach. In this approach, a two-dimensional grating can be non-lithographically integrated on the top of virtually any types of LEDs with controlled structural parameters and material indices. As a proof of concept, our designed photonic structure was implemented on a GaAs double heterojunction LED. Using numerical electromagnetic simulations, we explored the effects of the structural parameters (the grating period, layer thickness and material indices) on the device performances, followed by fabrication through a self-assembled porous alumina as a template. Device simulation and experimental results indicate that an optimized high-index-contrast (a-Si / air) grating obtains a much larger efficiency increase than using a low-index SiO2 grating. In addition, the devices maintain a Lambertian radiation pattern with the self-assembled grating. This technique provides an effective and low-cost method for improving LED efficiency.
Related Papers
- → Optimal pruning for selecting LEDs to synthesize tunable illumination spectra(2011)20 cited
- → Enhancing Light Output of GaN-Based LEDs With Graded-Thickness Quantum Wells and Barriers(2013)4 cited
- Study for Cultivation of Chlorella sp. FC-21 under Different Colors of Light Emitting Diodes (LEDs)(2011)
- → A Study on 3D InGaN/GaN Nanorod LEDs(2014)
- 적색과 초적색 LEDs 보광이 ‘홍로’/M.26 사과의 과실품질에 미치는 영향(2013)