Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO 2 microsphere arrays

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-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 TiO 2 microsphere arrays. The optimization studies of the dipping method and rapid convective deposition (RCD) method were carried out for the deposition of TiO 2 microsphere arrays onto LEDs. The 2-dimensional relatively close-packed and close-packed TiO 2 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 TiO 2 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 languageEnglish (US)
Title of host publicationLight-Emitting Diodes
Subtitle of host publicationMaterials, Devices, and Applications for Solid State Lighting XV
Volume7954
DOIs
StatePublished - 2011
Externally publishedYes
EventLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV - San Francisco, CA, United States
Duration: Jan 25 2011Jan 27 2011

Other

OtherLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV
CountryUnited States
CitySan Francisco, CA
Period01/25/1101/27/11

Keywords

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

ASJC Scopus subject areas

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

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