18 August 2010 High-efficiency photonic quasi-crystal light emitting diodes incorporating buried photonic crystal structures
Author Affiliations +
In this paper we investigate the utilization of a patterned photonic crystal layer positioned below the Multiple Quantum Well region of a p-side up LED to improve light extraction and investigate the benefit of adding additional top surface photonic crystal patterning to the same device. Performance for each design is evaluated in terms of angular extraction efficiency and far field angular beam profile for fixed lattice geometry and a range of etch depths. We show that a buried photonic crystal lattice improves extraction for emission angles below the critical angle for total internal reflection, and does not have a detrimental effect over the normal extraction cone of the LED. An improvement of (33% to 57% in extraction efficiency is obtained using a buried photonic crystal lattice alone. The introduction of additional top surface patterning has potential to further improve the extraction efficiency up to 73%, and to tailor the shape of the emission profile.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Martin D. B. Charlton, Martin D. B. Charlton, Philip A. Shields, Philip A. Shields, Duncan W. E. Allsop, Duncan W. E. Allsop, Wang N. Wang, Wang N. Wang, } "High-efficiency photonic quasi-crystal light emitting diodes incorporating buried photonic crystal structures", Proc. SPIE 7784, Tenth International Conference on Solid State Lighting, 778407 (18 August 2010); doi: 10.1117/12.860585; https://doi.org/10.1117/12.860585

Back to Top