Emission pattern control and polarized light emission through patterned graded-refractiveindex coatings on GaInN light-emitting diodes

Ming Ma; Ahmed N. Noemaun; Jaehee Cho; E. Fred Schubert; Gi Bum Kim; Cheolsoo Sone

doi:10.1364/OE.20.016677

Emission pattern control and polarized light emission through patterned graded-refractiveindex coatings on GaInN light-emitting diodes

Ming Ma^*
, Ahmed N. Noemaun
, Jaehee Cho
, E. Fred Schubert
, Gi Bum Kim
, Cheolsoo Sone

^*Corresponding author for this work

Department of Semiconductor Science and Technology

Rensselaer Polytechnic Institute
Samsung

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

7 Scopus citations

Abstract

Patterned graded-refractive-index (GRIN) coatings that offer the controllability of far-field emission pattern and polarization properties of GaInN light-emitting diodes (LEDs) are investigated. Compared with a planar reference LED, the light-output power of an LED with patterned GRIN coatings (GRIN LED) is enhanced by about 69%. Furthermore, the GRIN LED has bidirectional emission peaks at about 45° off-surfacenormal and polarized light emission with the maximum polarization ratio occurring at the same angle, i.e. The intensity maximum and the polarization-ratio maximum coincide. The large off-surface-normal emission of the GRIN LED results from the strong light extraction through the sidewalls of the GRIN pillars, which is in good agreement with results predicted from ray-tracing simulations.

Original language	English
Pages (from-to)	16677-16683
Number of pages	7
Journal	Optics Express
Volume	20
Issue number	15
DOIs	https://doi.org/10.1364/OE.20.016677
State	Published - 2012.07.16

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title = "Emission pattern control and polarized light emission through patterned graded-refractiveindex coatings on GaInN light-emitting diodes",

abstract = "Patterned graded-refractive-index (GRIN) coatings that offer the controllability of far-field emission pattern and polarization properties of GaInN light-emitting diodes (LEDs) are investigated. Compared with a planar reference LED, the light-output power of an LED with patterned GRIN coatings (GRIN LED) is enhanced by about 69\%. Furthermore, the GRIN LED has bidirectional emission peaks at about 45° off-surfacenormal and polarized light emission with the maximum polarization ratio occurring at the same angle, i.e. The intensity maximum and the polarization-ratio maximum coincide. The large off-surface-normal emission of the GRIN LED results from the strong light extraction through the sidewalls of the GRIN pillars, which is in good agreement with results predicted from ray-tracing simulations.",

author = "Ming Ma and Noemaun, \{Ahmed N.\} and Jaehee Cho and Schubert, \{E. Fred\} and Kim, \{Gi Bum\} and Cheolsoo Sone",

year = "2012",

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day = "16",

doi = "10.1364/OE.20.016677",

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volume = "20",

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TY - JOUR

T1 - Emission pattern control and polarized light emission through patterned graded-refractiveindex coatings on GaInN light-emitting diodes

AU - Ma, Ming

AU - Noemaun, Ahmed N.

AU - Cho, Jaehee

AU - Schubert, E. Fred

AU - Kim, Gi Bum

AU - Sone, Cheolsoo

PY - 2012/7/16

Y1 - 2012/7/16

N2 - Patterned graded-refractive-index (GRIN) coatings that offer the controllability of far-field emission pattern and polarization properties of GaInN light-emitting diodes (LEDs) are investigated. Compared with a planar reference LED, the light-output power of an LED with patterned GRIN coatings (GRIN LED) is enhanced by about 69%. Furthermore, the GRIN LED has bidirectional emission peaks at about 45° off-surfacenormal and polarized light emission with the maximum polarization ratio occurring at the same angle, i.e. The intensity maximum and the polarization-ratio maximum coincide. The large off-surface-normal emission of the GRIN LED results from the strong light extraction through the sidewalls of the GRIN pillars, which is in good agreement with results predicted from ray-tracing simulations.

AB - Patterned graded-refractive-index (GRIN) coatings that offer the controllability of far-field emission pattern and polarization properties of GaInN light-emitting diodes (LEDs) are investigated. Compared with a planar reference LED, the light-output power of an LED with patterned GRIN coatings (GRIN LED) is enhanced by about 69%. Furthermore, the GRIN LED has bidirectional emission peaks at about 45° off-surfacenormal and polarized light emission with the maximum polarization ratio occurring at the same angle, i.e. The intensity maximum and the polarization-ratio maximum coincide. The large off-surface-normal emission of the GRIN LED results from the strong light extraction through the sidewalls of the GRIN pillars, which is in good agreement with results predicted from ray-tracing simulations.

UR - https://www.scopus.com/pages/publications/84864124708

U2 - 10.1364/OE.20.016677

DO - 10.1364/OE.20.016677

M3 - Journal article

AN - SCOPUS:84864124708

SN - 1094-4087

VL - 20

SP - 16677

EP - 16683

JO - Optics Express

JF - Optics Express

IS - 15

ER -

Emission pattern control and polarized light emission through patterned graded-refractiveindex coatings on GaInN light-emitting diodes

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