Electrical polarization effects on the optical polarization properties of AlGaN ultraviolet light-emitting diodes

Yi An Chang, Fang Ming Chen, Shan Rong Li, Yen-Kuang Kuo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this paper, the electrical polarization effects on the optical polarization properties of Al0.35Ga0.65N multiple quantum well (MQW) ultraviolet (UV) light-emitting diodes (LEDs) by varying the Al content in AlGaN quantum well (QW) barriers are qualitatively analyzed. Numerical simulation results show that the varied potential barrier height and different polarization-induced electric field resulting from varying the Al content in AlGaN QW barriers have great influence on the transverse electric (TE) and transverse magnetic (TM) emission intensities. Both the TE-and TM-polarized spontaneous emissions from the Al0.35Ga0.65N QWs decrease with the increase of the Al content in AlGaN QW barriers, which is attributed to the poor carrier confinement resulting from the more serious band bending effect and the reduced effective potential barrier height in the conduction band, especially, the degree of optical polarization increases with the increase of the Al content in AlGaN QW barriers due to the rearrangement of the valence subbands near theΓ-point of the Brillouin zone. It is consequently concluded that the TE and TM spontaneous emissions and the degree of optical polarization are closely related to the Al content in AlGaN QW barriers of the Al0.35Ga0.65N MQW UV LEDs.

Original languageEnglish
Article number6874513
Pages (from-to)3233-3238
Number of pages6
JournalIEEE Transactions on Electron Devices
Volume61
Issue number9
DOIs
Publication statusPublished - 2014 Jan 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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