Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO2 microsphere arrays

Xiao Hang Li; Yik Khoon Ee; Renbo Song; Nelson Tansu

doi:10.1117/12.875980

Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO₂ microsphere arrays

Xiao Hang Li^*, Yik Khoon Ee, Renbo Song, Nelson Tansu

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The enhancement of light extraction efficiency of InGaN quantum well (QW) light emitting diodes (LEDs) was achieved by employing the refractive index matched TiO₂ microsphere arrays. The optimization studies of the dipping method and rapid convective deposition (RCD) method were carried out for the deposition of TiO₂ microsphere arrays onto LEDs. The 2-dimensional relatively close-packed and close-packed TiO₂ microsphere arrays were deposited by the using optimized conditions of the dipping method and RCD method, respectively. The light extraction efficiencies of LEDs under electrical injection were enhanced by 1.83 times by utilizing 520-nm diameter TiO₂ microspheres. This enhancement is primarily attributed to increase in the effective photon escape cone due to the matched index and spherical shape of TiO2 microstructures arrays.

Original language	English (US)
Title of host publication	Light-Emitting Diodes
Subtitle of host publication	Materials, Devices, and Applications for Solid State Lighting XV
DOIs	https://doi.org/10.1117/12.875980
State	Published - 2011
Externally published	Yes
Event	Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV - San Francisco, CA, United States Duration: Jan 25 2011 → Jan 27 2011

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7954
ISSN (Print)	0277-786X

Other

Other	Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV
Country/Territory	United States
City	San Francisco, CA
Period	01/25/11 → 01/27/11

Keywords

InGaN quantum wells
TiO microspheres
light emitting diodes
light extraction efficiency
matched refractive index

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Applied Mathematics
Electrical and Electronic Engineering
Computer Science Applications

Access to Document

10.1117/12.875980

Cite this

Li, X. H., Ee, Y. K., Song, R., & Tansu, N. (2011). Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO₂ microsphere arrays. In Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV Article 79540U (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7954). https://doi.org/10.1117/12.875980

@inproceedings{645b54897fc142a3b35472d1b127a8e9,

title = "Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO2 microsphere arrays",

abstract = "The enhancement of light extraction efficiency of InGaN quantum well (QW) light emitting diodes (LEDs) was achieved by employing the refractive index matched TiO2 microsphere arrays. The optimization studies of the dipping method and rapid convective deposition (RCD) method were carried out for the deposition of TiO2 microsphere arrays onto LEDs. The 2-dimensional relatively close-packed and close-packed TiO2 microsphere arrays were deposited by the using optimized conditions of the dipping method and RCD method, respectively. The light extraction efficiencies of LEDs under electrical injection were enhanced by 1.83 times by utilizing 520-nm diameter TiO2 microspheres. This enhancement is primarily attributed to increase in the effective photon escape cone due to the matched index and spherical shape of TiO2 microstructures arrays.",

keywords = "InGaN quantum wells, TiO microspheres, light emitting diodes, light extraction efficiency, matched refractive index",

author = "Li, {Xiao Hang} and Ee, {Yik Khoon} and Renbo Song and Nelson Tansu",

year = "2011",

doi = "10.1117/12.875980",

language = "English (US)",

isbn = "9780819484918",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

booktitle = "Light-Emitting Diodes",

note = "Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV ; Conference date: 25-01-2011 Through 27-01-2011",

}

Li, XH, Ee, YK, Song, R & Tansu, N 2011, Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO₂ microsphere arrays. in Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV., 79540U, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7954, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV, San Francisco, CA, United States, 01/25/11. https://doi.org/10.1117/12.875980

Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO₂ microsphere arrays. / Li, Xiao Hang; Ee, Yik Khoon; Song, Renbo et al.
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV. 2011. 79540U (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7954).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO2 microsphere arrays

AU - Li, Xiao Hang

AU - Ee, Yik Khoon

AU - Song, Renbo

AU - Tansu, Nelson

PY - 2011

Y1 - 2011

N2 - The enhancement of light extraction efficiency of InGaN quantum well (QW) light emitting diodes (LEDs) was achieved by employing the refractive index matched TiO2 microsphere arrays. The optimization studies of the dipping method and rapid convective deposition (RCD) method were carried out for the deposition of TiO2 microsphere arrays onto LEDs. The 2-dimensional relatively close-packed and close-packed TiO2 microsphere arrays were deposited by the using optimized conditions of the dipping method and RCD method, respectively. The light extraction efficiencies of LEDs under electrical injection were enhanced by 1.83 times by utilizing 520-nm diameter TiO2 microspheres. This enhancement is primarily attributed to increase in the effective photon escape cone due to the matched index and spherical shape of TiO2 microstructures arrays.

AB - The enhancement of light extraction efficiency of InGaN quantum well (QW) light emitting diodes (LEDs) was achieved by employing the refractive index matched TiO2 microsphere arrays. The optimization studies of the dipping method and rapid convective deposition (RCD) method were carried out for the deposition of TiO2 microsphere arrays onto LEDs. The 2-dimensional relatively close-packed and close-packed TiO2 microsphere arrays were deposited by the using optimized conditions of the dipping method and RCD method, respectively. The light extraction efficiencies of LEDs under electrical injection were enhanced by 1.83 times by utilizing 520-nm diameter TiO2 microspheres. This enhancement is primarily attributed to increase in the effective photon escape cone due to the matched index and spherical shape of TiO2 microstructures arrays.

KW - InGaN quantum wells

KW - TiO microspheres

KW - light emitting diodes

KW - light extraction efficiency

KW - matched refractive index

UR - http://www.scopus.com/inward/record.url?scp=79952943963&partnerID=8YFLogxK

U2 - 10.1117/12.875980

DO - 10.1117/12.875980

M3 - Conference contribution

AN - SCOPUS:79952943963

SN - 9780819484918

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Light-Emitting Diodes

T2 - Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV

Y2 - 25 January 2011 through 27 January 2011

ER -