Light extraction efficiency and radiation patterns of III-nitride light-emitting diodes with colloidal microlens arrays with various aspect ratios

Xiao Hang Li; Renbo Song; Yik Khoon Ee; Pisist Kumnorkaew; James F. Gilchrist; Nelson Tansu

doi:10.1109/JPHOT.2011.2150745

Light extraction efficiency and radiation patterns of III-nitride light-emitting diodes with colloidal microlens arrays with various aspect ratios

Xiao Hang Li^*, Renbo Song, Yik Khoon Ee, Pisist Kumnorkaew, James F. Gilchrist, Nelson Tansu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

195 Scopus citations

Abstract

The fabrication studies of silica/polystyrene (PS) colloidal microlens arrays with various aspect ratios were performed on the III-nitride light-emitting diodes (LEDs). The use of colloidal-based microlens arrays led to significant enhancement in light extraction efficiency for III-nitride LEDs. In varying the aspect ratios of the microlens arrays, the engineering of various PS thicknesses was employed by using high-temperature treatment and redeposition process. The effects of PS thickness on the light extraction efficiency and far-field emission patterns of InGaN quantum-well (QW) LEDs were studied. The total output powers of microlens LEDs with various PS thicknesses exhibited 1.932.70 times enhancement over that of planar LEDs, and the use of optimized PS layer thickness is important in leading the enhancement of the light extraction efficiency in large angular direction.

Original language	English (US)
Article number	5763721
Pages (from-to)	489-499
Number of pages	11
Journal	IEEE Photonics Journal
Volume	3
Issue number	3
DOIs	https://doi.org/10.1109/JPHOT.2011.2150745
State	Published - Jun 2011
Externally published	Yes

Bibliographical note

Funding Information:
Manuscript received April 1, 2011; accepted April 26, 2011. Date of publication May 5, 2011; date of current version May 20, 2011. The work was supported by the U.S. Department of Energy under Grant NETL, DE-PS26-08NT00290, the National Science Foundation under Award 0828426, and the Class of 1961 Professorship Fund. Corresponding authors: X.-H. Li and N. Tansu (e-mail: Li@ Lehigh.Edu; [email protected]).

Keywords

III-Nitrides
far-field radiation
light extraction efficiency
light-emitting diodes (LEDs)
microlens arrays

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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10.1109/JPHOT.2011.2150745

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title = "Light extraction efficiency and radiation patterns of III-nitride light-emitting diodes with colloidal microlens arrays with various aspect ratios",

abstract = "The fabrication studies of silica/polystyrene (PS) colloidal microlens arrays with various aspect ratios were performed on the III-nitride light-emitting diodes (LEDs). The use of colloidal-based microlens arrays led to significant enhancement in light extraction efficiency for III-nitride LEDs. In varying the aspect ratios of the microlens arrays, the engineering of various PS thicknesses was employed by using high-temperature treatment and redeposition process. The effects of PS thickness on the light extraction efficiency and far-field emission patterns of InGaN quantum-well (QW) LEDs were studied. The total output powers of microlens LEDs with various PS thicknesses exhibited 1.932.70 times enhancement over that of planar LEDs, and the use of optimized PS layer thickness is important in leading the enhancement of the light extraction efficiency in large angular direction.",

keywords = "III-Nitrides, far-field radiation, light extraction efficiency, light-emitting diodes (LEDs), microlens arrays",

author = "Li, {Xiao Hang} and Renbo Song and Ee, {Yik Khoon} and Pisist Kumnorkaew and Gilchrist, {James F.} and Nelson Tansu",

note = "Funding Information: Manuscript received April 1, 2011; accepted April 26, 2011. Date of publication May 5, 2011; date of current version May 20, 2011. The work was supported by the U.S. Department of Energy under Grant NETL, DE-PS26-08NT00290, the National Science Foundation under Award 0828426, and the Class of 1961 Professorship Fund. Corresponding authors: X.-H. Li and N. Tansu (e-mail: Li@ Lehigh.Edu; [email protected]).",

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AU - Gilchrist, James F.

AU - Tansu, Nelson

N1 - Funding Information: Manuscript received April 1, 2011; accepted April 26, 2011. Date of publication May 5, 2011; date of current version May 20, 2011. The work was supported by the U.S. Department of Energy under Grant NETL, DE-PS26-08NT00290, the National Science Foundation under Award 0828426, and the Class of 1961 Professorship Fund. Corresponding authors: X.-H. Li and N. Tansu (e-mail: Li@ Lehigh.Edu; [email protected]).

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Light extraction efficiency and radiation patterns of III-nitride light-emitting diodes with colloidal microlens arrays with various aspect ratios

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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