E
E. Fred Schubert
Researcher at Rensselaer Polytechnic Institute
Publications - 65
Citations - 6976
E. Fred Schubert is an academic researcher from Rensselaer Polytechnic Institute. The author has contributed to research in topics: Light-emitting diode & Voltage droop. The author has an hindex of 35, co-authored 65 publications receiving 6551 citations. Previous affiliations of E. Fred Schubert include Alcatel-Lucent.
Papers
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Journal ArticleDOI
Origin of efficiency droop in GaN-based light-emitting diodes
Min-Ho Kim,Martin F. Schubert,Qi Dai,Jong Kyu Kim,E. Fred Schubert,Joachim Piprek,Yongjo Park +6 more
TL;DR: In this paper, the efficiency droop in GaInN∕GaN multiple-quantum well (MQW) light-emitting diodes was investigated and it was shown that the droop is not related to MQW efficiency but rather to the recombination of carriers outside the MqW region.
Journal ArticleDOI
Optical thin-film materials with low refractive index for broadband elimination of Fresnel reflection
J.-Q. Xi,Martin F. Schubert,Jong Kyu Kim,E. Fred Schubert,Minfeng Chen,Shawn-Yu Lin,W. Liu,J. A. Smart +7 more
TL;DR: Optical thin-film materials with low refractive index for broadband elimination of Fresnel reflection were used in this paper, where the authors proposed a method to eliminate the reflection in optical thin-films.
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Polarization-matched GaInN∕AlGaInN multi-quantum-well light-emitting diodes with reduced efficiency droop
Martin F. Schubert,Jiuru Xu,Jong Kyu Kim,E. Fred Schubert,Min-Ho Kim,Sukho Yoon,Soo Min Lee,Cheolsoo Sone,T. Sakong,Yongjo Park +9 more
TL;DR: The use of quaternary alloys enables an independent control over interface polarization charges and bandgap and has been suggested as a method to reduce electron leakage from the active region, a carrier loss mechanism that can reduce efficiency at high injection currents as mentioned in this paper.
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Effect of dislocation density on efficiency droop in GaInN∕GaN light-emitting diodes
Martin F. Schubert,Sameer Chhajed,Jong Kyu Kim,E. Fred Schubert,Daniel D. Koleske,Mary H. Crawford,Stephen R. Lee,Arthur J. Fischer,Gerald Thaler,Michael A. Banas +9 more
TL;DR: In this article, measurements of light-output power versus current were performed for GaInN∕GaN light-emitting diodes grown on GaN-on-sapphire templates with different threading dislocation densities.
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Nanostructured multilayer graded-index antireflection coating for Si solar cells with broadband and omnidirectional characteristics
TL;DR: In this paper, a broadband, omnidirectional, graded-index antireflection (AR) coating made using nanostructured low-refractive index (n=1.05-1.40) silica deposited by oblique-angle deposition is reported.