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E. Fred Schubert
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Journal Articles

A next-generation light-emitting device: ZOGAN LED with a heterogeneous p-layer composed of oxide and nitride semiconductors

Yung Ryel Ryu, Sung Ki Hong, E. Fred Schubert, Dong-Min Jeon, Dong-Soo Shin, Jong-In Shim, Sang-Mook Kim, Jong Hyeob Baek
Journal: AIP Advances
AIP Advances 14, 045215 (2024)
https://doi.org/10.1063/5.0192350
Published: April 2024
View article titled, A next-generation light-emitting device: ZOGAN LED with a heterogeneous p-layer composed of oxide and nitride semiconductors
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Journal Articles

Energy bandgap variation in oblique angle-deposited indium tin oxide

Kyurin Kim, Jun Hyuk Park, Hyunsoo Kim, Jong Kyu Kim, E. Fred Schubert, Jaehee Cho
Journal: Applied Physics Letters
Appl. Phys. Lett. 108, 041910 (2016)
https://doi.org/10.1063/1.4940998
Published: January 2016
View article titled, Energy bandgap variation in oblique angle-deposited indium tin oxide
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Journal Articles

Variation of the external quantum efficiency with temperature and current density in red, blue, and deep ultraviolet light-emitting diodes

Jun Hyuk Park, Jong Won Lee, Dong Yeong Kim, Jaehee Cho, E. Fred Schubert, Jungsub Kim, Jinsub Lee, Yong-Il Kim, Youngsoo Park, Jong Kyu Kim
Journal: Journal of Applied Physics
J. Appl. Phys. 119, 023101 (2016)
https://doi.org/10.1063/1.4939504
Published: January 2016
View article titled, Variation of the external quantum efficiency with temperature and current density in red, blue, and deep ultraviolet light-emitting diodes
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Journal Articles

“U-turn” feature in the efficiency-versus-current curve of GaInN/GaN light-emitting diodes

Guan-Bo Lin, Qifeng Shan, Yaqi Wang, Ting Li, E. Fred Schubert
Journal: Applied Physics Letters
Appl. Phys. Lett. 105, 221116 (2014)
https://doi.org/10.1063/1.4903518
Published: December 2014
View article titled, “U-turn” feature in the efficiency-versus-current curve of GaInN/GaN light-emitting diodes
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Journal Articles

Fabrication of tapered graded-refractive-index micropillars using ion-implanted-photoresist as an etch mask

Ming Ma, E. Fred Schubert, Jaehee Cho, Morgan Evans, Gi Bum Kim, Cheolsoo Sone
Journal: Journal of Vacuum Science & Technology A
J. Vac. Sci. Technol. A 32, 021305 (2014)
https://doi.org/10.1116/1.4862547
Published: January 2014
View article titled, Fabrication of tapered graded-refractive-index micropillars using ion-implanted-photoresist as an etch mask
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Journal Articles

GaInN light-emitting diodes using separate epitaxial growth for the p-type region to attain polarization-inverted electron-blocking layer, reduced electron leakage, and improved hole injection

David S. Meyaard, Guan-Bo Lin, Ming Ma, Jaehee Cho, E. Fred Schubert, Sang-Heon Han, Min-Ho Kim, HyunWook Shim, Young Sun Kim
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 201112 (2013)
https://doi.org/10.1063/1.4829576
Published: November 2013
View article titled, GaInN light-emitting diodes using separate epitaxial growth for the p-type region to attain polarization-inverted electron-blocking layer, reduced electron leakage, and improved hole injection
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Journal Articles

Analysis of the temperature dependence of the forward voltage characteristics of GaInN light-emitting diodes

David S. Meyaard, Jaehee Cho, E. Fred Schubert, Sang-Heon Han, Min-Ho Kim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 121103 (2013)
https://doi.org/10.1063/1.4821538
Published: September 2013
View article titled, Analysis of the temperature dependence of the forward voltage characteristics of GaInN light-emitting diodes
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Journal Articles

Enhanced overall efficiency of GaInN-based light-emitting diodes with reduced efficiency droop by Al-composition-graded AlGaN/GaN superlattice electron blocking layer

Jun Hyuk Park, Dong Yeong Kim, Sunyong Hwang, David Meyaard, E. Fred Schubert, Yu Dae Han, Joo Won Choi, Jaehee Cho, Jong Kyu Kim
Journal: Applied Physics Letters
Appl. Phys. Lett. 103, 061104 (2013)
https://doi.org/10.1063/1.4817800
Published: August 2013
View article titled, Enhanced overall efficiency of GaInN-based light-emitting diodes with reduced efficiency droop by Al-composition-graded AlGaN/GaN superlattice electron blocking layer
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Journal Articles

Identifying the cause of the efficiency droop in GaInN light-emitting diodes by correlating the onset of high injection with the onset of the efficiency droop

David S. Meyaard, Guan-Bo Lin, Jaehee Cho, E. Fred Schubert, Hyunwook Shim, Sang-Heon Han, Min-Ho Kim, Cheolsoo Sone, Young Sun Kim
Journal: Applied Physics Letters
Appl. Phys. Lett. 102, 251114 (2013)
https://doi.org/10.1063/1.4811558
Published: June 2013
View article titled, Identifying the cause of the efficiency droop in GaInN light-emitting diodes by correlating the onset of high injection with the onset of the efficiency droop
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Journal Articles

Method for determining the radiative efficiency of GaInN quantum wells based on the width of efficiency-versus-carrier-concentration curve

Guan-Bo Lin, Qifeng Shan, Andrew J. Birkel, Jaehee Cho, E. Fred Schubert, Mary H. Crawford, Karl R. Westlake, Daniel D. Koleske
Journal: Applied Physics Letters
Appl. Phys. Lett. 101, 241104 (2012)
https://doi.org/10.1063/1.4770317
Published: December 2012
View article titled, Method for determining the radiative efficiency of GaInN quantum wells based on the width of efficiency-versus-carrier-concentration curve
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Journal Articles

Analysis of parasitic cyan luminescence occurring in GaInN blue light-emitting diodes

Qifeng Shan, Yong Suk Cho, Guan-Bo Lin, David S. Meyaard, Jaehee Cho, E. Fred Schubert, Joong Kon Son, Cheolsoo Sone
Journal: Journal of Applied Physics
J. Appl. Phys. 112, 074512 (2012)
https://doi.org/10.1063/1.4754829
Published: October 2012
View article titled, Analysis of parasitic cyan luminescence occurring in GaInN blue light-emitting diodes
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Journal Articles

Strong light-extraction enhancement in GaInN light-emitting diodes patterned with TiO2 micro-pillars with tapered sidewalls

Ming Ma, Jaehee Cho, E. Fred Schubert, Yongjo Park, Gi Bum Kim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 101, 141105 (2012)
https://doi.org/10.1063/1.4756797
Published: October 2012
View article titled, Strong light-extraction enhancement in GaInN light-emitting diodes patterned with TiO<sub>2</sub> micro-pillars with tapered sidewalls
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Journal Articles

Polarized light emission from GaInN light-emitting diodes embedded with subwavelength aluminum wire-grid polarizers

Ming Ma, David S. Meyaard, Qifeng Shan, Jaehee Cho, E. Fred Schubert, Gi Bum Kim, Min-Ho Kim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 101, 061103 (2012)
https://doi.org/10.1063/1.4744422
Published: August 2012
View article titled, Polarized light emission from GaInN light-emitting diodes embedded with subwavelength aluminum wire-grid polarizers
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Journal Articles

Analytic model for the efficiency droop in semiconductors with asymmetric carrier-transport properties based on drift-induced reduction of injection efficiency

Guan-Bo Lin, David Meyaard, Jaehee Cho, E. Fred Schubert, Hyunwook Shim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 100, 161106 (2012)
https://doi.org/10.1063/1.4704366
Published: April 2012
View article titled, Analytic model for the efficiency droop in semiconductors with asymmetric carrier-transport properties based on drift-induced reduction of injection efficiency
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Journal Articles

Efficiency droop in AlGaInP and GaInN light-emitting diodes

Jong-In Shim, Dong-Pyo Han, Hyunsung Kim, Dong-Soo Shin, Guan-Bo Lin, David S. Meyaard, Qifeng Shan, Jaehee Cho, E. Fred Schubert, Hyunwook Shim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 100, 111106 (2012)
https://doi.org/10.1063/1.3694044
Published: March 2012
View article titled, Efficiency droop in AlGaInP and GaInN light-emitting diodes
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Journal Articles

Temperature dependent efficiency droop in GaInN light-emitting diodes with different current densities

David S. Meyaard, Qifeng Shan, Jaehee Cho, E. Fred Schubert, Sang-Heon Han, Min-Ho Kim, Cheolsoo Sone, Seung Jae Oh, Jong Kyu Kim
Journal: Applied Physics Letters
Appl. Phys. Lett. 100, 081106 (2012)
https://doi.org/10.1063/1.3688041
Published: February 2012
View article titled, Temperature dependent efficiency droop in GaInN light-emitting diodes with different current densities
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Journal Articles

Transport-mechanism analysis of the reverse leakage current in GaInN light-emitting diodes

Qifeng Shan, David S. Meyaard, Qi Dai, Jaehee Cho, E. Fred Schubert, Joong Kon Son, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 99, 253506 (2011)
https://doi.org/10.1063/1.3668104
Published: December 2011
View article titled, Transport-mechanism analysis of the reverse leakage current in GaInN light-emitting diodes
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Journal Articles

Asymmetry of carrier transport leading to efficiency droop in GaInN based light-emitting diodes

David S. Meyaard, Guan-Bo Lin, Qifeng Shan, Jaehee Cho, E. Fred Schubert, Hyunwook Shim, Min-Ho Kim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 99, 251115 (2011)
https://doi.org/10.1063/1.3671395
Published: December 2011
View article titled, Asymmetry of carrier transport leading to efficiency droop in GaInN based light-emitting diodes
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Journal Articles

Promotion of hole injection enabled by GaInN/GaN light-emitting triodes and its effect on the efficiency droop

Sunyong Hwang, Woo Jin Ha, Jong Kyu Kim, Jiuru Xu, Jaehee Cho, E. Fred Schubert
Journal: Applied Physics Letters
Appl. Phys. Lett. 99, 181115 (2011)
https://doi.org/10.1063/1.3658388
Published: November 2011
View article titled, Promotion of hole injection enabled by GaInN/GaN light-emitting triodes and its effect on the efficiency droop
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Journal Articles

Optically functional surface composed of patterned graded-refractive-index coatings to enhance light-extraction of GaInN light-emitting diodes

Ahmed N. Noemaun, Frank W. Mont, Guan-Bo Lin, Jaehee Cho, E. Fred Schubert, Gi Bum Kim, Cheolsoo Sone, Jong Kyu Kim
Journal: Journal of Applied Physics
J. Appl. Phys. 110, 054510 (2011)
https://doi.org/10.1063/1.3632072
Published: September 2011
View article titled, Optically functional surface composed of patterned graded-refractive-index coatings to enhance light-extraction of GaInN light-emitting diodes
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