Document Detail

Design and fabrication of high-index-contrast self-assembled texture for light extraction enhancement in LEDs.
MedLine Citation:
PMID:  21747537     Owner:  NLM     Status:  In-Data-Review    
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 SiO<sub>2</sub> 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.
Xing Sheng; Lirong Zeng Broderick; Juejun Hu; Li Yang; Anat Eshed; Eugene A Fitzgerald; Jurgen Michel; Lionel C Kimerling
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  19 Suppl 4     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-07-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  A701-9     Citation Subset:  IM    
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