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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

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

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

Size-dependence of Raman scattering from graphene quantum dots: Interplay between shape and thickness

Sung Kim, Dong Hee Shin, Chang Oh Kim, Soo Seok Kang, Soong Sin Joo, Suk-Ho Choi, Sung Won Hwang, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 102, 053108 (2013)
https://doi.org/10.1063/1.4790641
Published: February 2013
View article titled, Size-dependence of Raman scattering from graphene quantum dots: Interplay between shape and thickness
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Journal Articles

Size-dependent radiative decay processes in graphene quantum dots

Sung Kim, Dong Hee Shin, Chang Oh Kim, Soo Seok Kang, Jong Min Kim, Suk-Ho Choi, Li-Hua Jin, Yong-Hoon Cho, Sung Won Hwang, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 101, 163103 (2012)
https://doi.org/10.1063/1.4760269
Published: October 2012
View article titled, Size-dependent radiative decay processes in graphene quantum dots
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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

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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Journal Articles

Inductively coupled plasma etching of graded-refractive-index layers of TiO2 and SiO2 using an ITO hard mask

Ahmed N. Noemaun, Frank W. Mont, Jaehee Cho, E. Fred Schubert, Gi Bum Kim, Cheolsoo Sone
Journal: Journal of Vacuum Science & Technology A
J. Vac. Sci. Technol. A 29, 051302 (2011)
https://doi.org/10.1116/1.3620494
Published: August 2011
View article titled, Inductively coupled plasma etching of graded-refractive-index layers of TiO<sub>2</sub> and SiO<sub>2</sub> using an ITO hard mask
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Journal Articles

On the temperature dependence of electron leakage from the active region of GaInN/GaN light-emitting diodes

David S. Meyaard, Qifeng Shan, Qi Dai, Jaehee Cho, E. Fred Schubert, Min-Ho Kim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 99, 041112 (2011)
https://doi.org/10.1063/1.3618673
Published: July 2011
View article titled, On the temperature dependence of electron leakage from the active region of GaInN/GaN light-emitting diodes
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Journal Articles

Effects of polarization-field tuning in GaInN light-emitting diodes

Jiuru Xu, Martin F. Schubert, Di Zhu, Jaehee Cho, E. Fred Schubert, Hyunwook Shim, Cheolsoo Sone
Journal: Applied Physics Letters
Appl. Phys. Lett. 99, 041105 (2011)
https://doi.org/10.1063/1.3609783
Published: July 2011
View article titled, Effects of polarization-field tuning in GaInN light-emitting diodes
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Journal Articles

Electrically conductive thin-film color filters made of single-material indium-tin-oxide

Xing Yan, Frank W. Mont, David J. Poxson, Jaehee Cho, E. Fred Schubert, Min-Ho Kim, Cheolsoo Sone
Journal: Journal of Applied Physics
J. Appl. Phys. 109, 103113 (2011)
https://doi.org/10.1063/1.3592222
Published: May 2011
View article titled, Electrically conductive thin-film color filters made of single-material indium-tin-oxide
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Journal Articles

Reduction in efficiency droop, forward voltage, ideality factor, and wavelength shift in polarization-matched GaInN/GaInN multi-quantum-well light-emitting diodes

Jiuru Xu, Martin F. Schubert, Ahmed N. Noemaun, Di Zhu, Jong Kyu Kim, E. Fred Schubert, Min Ho Kim, Hun Jae Chung, Sukho Yoon, Cheolsoo Sone, Yongjo Park
Journal: Applied Physics Letters
Appl. Phys. Lett. 94, 011113 (2009)
https://doi.org/10.1063/1.3058687
Published: January 2009
View article titled, Reduction in efficiency droop, forward voltage, ideality factor, and wavelength shift in polarization-matched GaInN/GaInN multi-quantum-well light-emitting diodes
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Journal Articles

Elimination of total internal reflection in GaInN light-emitting diodes by graded-refractive-index micropillars

Jong Kyu Kim, Ahmed N. Noemaun, Frank W. Mont, David Meyaard, E. Fred Schubert, David J. Poxson, Hyunsoo Kim, Cheolsoo Sone, Yongjo Park
Journal: Applied Physics Letters
Appl. Phys. Lett. 93, 221111 (2008)
https://doi.org/10.1063/1.3041644
Published: December 2008
View article titled, Elimination of total internal reflection in GaInN light-emitting diodes by graded-refractive-index micropillars
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