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

doi:10.1063/1.3041644

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

Department of Semiconductor Science and Technology

Rensselaer Polytechnic Institute
Samsung

Research output: Contribution to journal › Journal article › peer-review

76 Scopus citations

Abstract

A method for enhancing the light-extraction efficiency of GaInN light-emitting diodes (LEDs) by complete elimination of total internal reflection is reported. Analytical calculations show that GaInN LEDs with multilayer graded-refractive-index pillars, in which the thickness and refractive index of each layer are optimized, have no total internal reflection. This results in a remarkable improvement in light-extraction efficiency. GaInN LEDs with five-layer graded-refractive-index pillars, fabricated by cosputtering TiO₂ and SiO₂, show a light-output power enhanced by 73% and a strong side emission, consistent with analytical calculations and ray-tracing simulations.

Original language	English
Article number	221111
Journal	Applied Physics Letters
Volume	93
Issue number	22
DOIs	https://doi.org/10.1063/1.3041644
State	Published - 2008

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10.1063/1.3041644

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@article{b387920f169b4b849669c9443a815368,

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

abstract = "A method for enhancing the light-extraction efficiency of GaInN light-emitting diodes (LEDs) by complete elimination of total internal reflection is reported. Analytical calculations show that GaInN LEDs with multilayer graded-refractive-index pillars, in which the thickness and refractive index of each layer are optimized, have no total internal reflection. This results in a remarkable improvement in light-extraction efficiency. GaInN LEDs with five-layer graded-refractive-index pillars, fabricated by cosputtering TiO2 and SiO2, show a light-output power enhanced by 73\% and a strong side emission, consistent with analytical calculations and ray-tracing simulations.",

author = "Kim, \{Jong Kyu\} and Noemaun, \{Ahmed N.\} and Mont, \{Frank W.\} and David Meyaard and Schubert, \{E. Fred\} and Poxson, \{David J.\} and Hyunsoo Kim and Cheolsoo Sone and Yongjo Park",

year = "2008",

doi = "10.1063/1.3041644",

language = "English",

volume = "93",

journal = "Applied Physics Letters",

issn = "0003-6951",

number = "22",

}

TY - JOUR

T1 - Elimination of total internal reflection in GaInN light-emitting diodes by graded-refractive-index micropillars

AU - Kim, Jong Kyu

AU - Noemaun, Ahmed N.

AU - Mont, Frank W.

AU - Meyaard, David

AU - Schubert, E. Fred

AU - Poxson, David J.

AU - Kim, Hyunsoo

AU - Sone, Cheolsoo

AU - Park, Yongjo

PY - 2008

Y1 - 2008

N2 - A method for enhancing the light-extraction efficiency of GaInN light-emitting diodes (LEDs) by complete elimination of total internal reflection is reported. Analytical calculations show that GaInN LEDs with multilayer graded-refractive-index pillars, in which the thickness and refractive index of each layer are optimized, have no total internal reflection. This results in a remarkable improvement in light-extraction efficiency. GaInN LEDs with five-layer graded-refractive-index pillars, fabricated by cosputtering TiO2 and SiO2, show a light-output power enhanced by 73% and a strong side emission, consistent with analytical calculations and ray-tracing simulations.

AB - A method for enhancing the light-extraction efficiency of GaInN light-emitting diodes (LEDs) by complete elimination of total internal reflection is reported. Analytical calculations show that GaInN LEDs with multilayer graded-refractive-index pillars, in which the thickness and refractive index of each layer are optimized, have no total internal reflection. This results in a remarkable improvement in light-extraction efficiency. GaInN LEDs with five-layer graded-refractive-index pillars, fabricated by cosputtering TiO2 and SiO2, show a light-output power enhanced by 73% and a strong side emission, consistent with analytical calculations and ray-tracing simulations.

UR - https://www.scopus.com/pages/publications/57349184111

U2 - 10.1063/1.3041644

DO - 10.1063/1.3041644

M3 - Journal article

AN - SCOPUS:57349184111

SN - 0003-6951

VL - 93

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

M1 - 221111

ER -

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

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