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Enhancing Both TM- and TE-Polarized Light Extraction Efficiency of AlGaN-Based Deep Ultraviolet Light-Emitting Diode via Air Cavity Extractor With Vertical Sidewall.
- Source :
- IEEE Photonics Journal; Aug2018, Vol. 10 Issue 4, p1-9, 9p
- Publication Year :
- 2018
-
Abstract
- In this work, we investigate the effect of sidewall angle, height and space of an air cavity extractor (AC-Extractor) on the polarization-dependent light extraction efficiency (LEE) for AlGaN-based deep-ultraviolet light-emitting diodes (DUV LEDs) using three-dimensional finite difference time-domain method. Compared to the reported inclined sidewall metal reflector (SM-Reflector), DUV LED with AC-Extractor shows better light extraction at any height and inclined angle due to different light extraction mechanisms. The light in SM-Reflector DUV LED is extracted mainly through mirror reflection. However, total internal reflection from the sidewall dominants the contribution to LEE for the AC-Extractor with smaller inclined angle such that the space has little impact, while Fresnel scattering is more important for the AC-Extractor with larger inclined angle and that the additional out-light channel as well as the space play a critical role in enhancing the LEE. And the analysis is further developed into a three-escape-cones analytic model theory. In particular, the AC-Extractor with vertical sidewall is more beneficial to enhance the LEE of DUV LED than that with inclined sidewall, which can be rationally explained based on the three-escape-cones analytic model. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19430655
- Volume :
- 10
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- IEEE Photonics Journal
- Publication Type :
- Academic Journal
- Accession number :
- 132683516
- Full Text :
- https://doi.org/10.1109/JPHOT.2018.2849747