Enhanced performance of high-power GaN LED by mediating surface plasmon polaritons

Ki Young Choi, Jaewoong Yoon, Seok Ho Song, Hyunjun Kim, Jin Ha Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We numerically study surface-plasmon (SP) mediated semiconductor light-emitting diodes (LEDs) and show that mediation of SPs can be useful for high power LEDs in their modulation speeds and directionalities. It has been reported that SPs can drastically enhance internal quantum efficiencies and speeds of InGaN quantum-well (QW) LEDs by letting them dominate spontaneous emission (SE) processes. Many experimental and theoretical studies have been conducted in this context but most of the works have dealt SE into SPs and light extraction from excited SPs separately. In particular, there is no theoretical analysis, to our knowledge, which simultaneously considers SE into SPs on a textured metal surface along with its extraction to outside radiation. In this presentation, we numerically study InGaN QW LEDs which consist of 1-D metallic gratings on a p-contact electrode and an adjacent single QW emitting green light by using finite-difference time-domain (FDTD) method. We focus on the case where the first order diffraction of SPs produces lightwaves propagating along the surface-normal direction. SP band-edge effect on SE rate, extraction of SPs into internal-radiation, and angular directionality of final outside-radiation are analyzed. Practical enhancement of LED performances are discussed on the basis of the simulation results.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationMetallic Nanostructures and Their Optical Properties VI
DOIs
StatePublished - 2008 Nov 21
EventPlasmonics: Metallic Nanostructures and Their Optical Properties VI - San Diego, CA, United States
Duration: 2008 Aug 102008 Aug 14

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7032
ISSN (Print)0277-786X

Other

OtherPlasmonics: Metallic Nanostructures and Their Optical Properties VI
CountryUnited States
CitySan Diego, CA
Period08/08/1008/08/14

Keywords

  • Dipole radiation
  • FDTD
  • Light emitting diode
  • Purcell factor
  • Surface plasmons

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    Choi, K. Y., Yoon, J., Song, S. H., Kim, H., & Kim, J. H. (2008). Enhanced performance of high-power GaN LED by mediating surface plasmon polaritons. In Plasmonics: Metallic Nanostructures and Their Optical Properties VI [70320R] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7032). https://doi.org/10.1117/12.794636