Journal ArticleDOI
Impact of texture-enhanced transmission on high-efficiency surface-textured light-emitting diodes
R. Windisch,C. Rooman,S Meinlschmidt,Peter Kiesel,D. Zipperer,G. H. Döhler,B. Dutta,Maarten Kuijk,Gustaaf Borghs,Paul Heremans +9 more
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TLDR
In this article, the authors investigated the transmission properties of semiconductor surfaces and found that an enhancement of the angle-averaged transmission by a factor of 2 can be achieved with optimum texturing parameters, providing an additional light extraction mechanism for high-efficiency surface-textured light-emitting diodes.Abstract:
The transmission properties of semiconductor surfaces can be changed by surface texturing. We investigate these changes experimentally and find that an enhancement of the angle-averaged transmission by a factor of 2 can be achieved with optimum texturing parameters. This enhanced transmission provides an additional light extraction mechanism for high-efficiency surface-textured light-emitting diodes. External quantum efficiencies of 46% and 54% are demonstrated before and after encapsulation, respectively.read more
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Lighting device and lighting method
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TL;DR: In this paper, the authors reviewed approaches to enhanced light extraction grouped into two sets depending on whether their application results in the change in the spontaneous emission rate or the angular distribution, or both.
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Light extraction analysis of GaN-based light-emitting diodes with surface texture and/or patterned substrate
TL;DR: For an LED encapsulated within an epoxy lens, the patterned substrate with pyramid array is found to be a more effective way to increase light extraction efficiency than the surface texture.
References
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Journal ArticleDOI
30% external quantum efficiency from surface textured, thin‐film light‐emitting diodes
TL;DR: In this article, the authors showed that by separating thin-film LEDs from their substrates (by epitaxial lift-off, for example), it is much easier for light to escape from the LED structure and thereby avoid absorption.
Journal ArticleDOI
High-power truncated-inverted-pyramid (AlxGa1−x)0.5In0.5P/GaP light-emitting diodes exhibiting >50% external quantum efficiency
Michael R. Krames,M. Ochiai-Holcomb,Gloria E Hofler,Carrie Carter-Coman,E. I. Chen,I.-H. Tan,P.N. Grillot,Nathan F. Gardner,Herman C Chui,J.-W. Huang,S. A. Stockman,F. A. Kish,M. G. Craford,T. S. Tan,C. P. Kocot,M. Hueschen,J. Posselt,B. Loh,G. Sasser,D. Collins +19 more
TL;DR: In this article, a truncated-inverted-pyramid (TIP) chip geometry was proposed to decrease the mean photon path length within the crystal, and thus reduce the effects of internal loss mechanisms.
Journal ArticleDOI
Resonant cavity light‐emitting diode
TL;DR: In this article, the active region of a light-emitting diode (LED) is placed in a resonant optical cavity and the optical emission is restricted to the modes of the cavity.
Journal ArticleDOI
Light extraction from optically pumped light-emitting diode by thin-slab photonic crystals
TL;DR: In this paper, a promising thin-slab light-emitting diode (LED) design was described, which uses a highly efficient coherent external scattering of trapped light by a two-dimensional (2D) photonic crystal.
Journal ArticleDOI
Surface plasmon enhanced light-emitting diode
TL;DR: In this paper, a method for enhancing the emission properties of light-emitting diodes, by coupling to surface plasmons, is analyzed both theoretically and experimentally, and the analyzed structure consists of a semiconductor emitter layer thinner than /spl lambda//2 sandwiched between two metal films.