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Proceedings Paper

Enhanced performance of high-power GaN LED by mediating surface plasmon polaritons
Author(s): Ki-young Choi; Jaewoong Yoon; Seok Ho Song; Hyunjun Kim; Jin-Ha Kim
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Paper 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.

Paper Details

Date Published: 26 August 2008
PDF: 7 pages
Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 70320R (26 August 2008); doi: 10.1117/12.794636
Show Author Affiliations
Ki-young Choi, Hanyang Univ. (Korea, Republic of)
Jaewoong Yoon, Hanyang Univ. (Korea, Republic of)
Seok Ho Song, Hanyang Univ. (Korea, Republic of)
Hyunjun Kim, Samsung Electro-Mechanics Co., Ltd. (Korea, Republic of)
Jin-Ha Kim, Samsung Electro-Mechanics Co., Ltd. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7032:
Plasmonics: Metallic Nanostructures and Their Optical Properties VI
Mark I. Stockman, Editor(s)

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