Nonpolar and semipolar LEDs

Y. R. Wu, C. Y. Huang, Yuji Zhao, J. S. Speck

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

A polarization-induced electric field fundamentally limits nitride-based LEDs grown on the c-plane. Nonpolar and semipolar LEDs have potential for superior performance through high internal quantum efficiency over a wide spectral region and low efficiency droop due to improved carrier transport and high compositional homogeneity. Nonpolar and semipolar LEDs possess unique electroluminescent characteristics such as polarized light emission and reduced wavelength shift due to the lift of degeneracy in the conduction band and mitigated quantum-confined Stark effect. In epitaxial growth, the surface morphology and defect generation mechanism on nonpolar and semipolar planes differ from those on the c-plane due to the anisotropic surface geometry and tilted slip systems. LED chips are designed to enhance the light extraction efficiency of nonpolar and semipolar LEDs grown on free-standing GaN substrates.

Original languageEnglish (US)
Title of host publicationNitride Semiconductor Light-Emitting Diodes (LEDs): Materials, Technologies and Applications
PublisherElsevier Ltd.
Pages250-275
Number of pages26
ISBN (Print)9780857095077
DOIs
StatePublished - Dec 2013
Externally publishedYes

Fingerprint

Light emitting diodes
Stark effect
Carrier transport
Light emission
Surface defects
Light polarization
Conduction bands
Quantum efficiency
Epitaxial growth
Nitrides
Surface morphology
Electric fields
Polarization
Wavelength
Geometry
Substrates

Keywords

  • AlGaN
  • Carrier transport
  • Droop
  • Epitaxy
  • GaN
  • InGaN
  • LED
  • MOCVD
  • Nitride
  • Nonpolar
  • QCSE
  • Semipolar

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Wu, Y. R., Huang, C. Y., Zhao, Y., & Speck, J. S. (2013). Nonpolar and semipolar LEDs. In Nitride Semiconductor Light-Emitting Diodes (LEDs): Materials, Technologies and Applications (pp. 250-275). Elsevier Ltd.. https://doi.org/10.1533/9780857099303.1.250

Nonpolar and semipolar LEDs. / Wu, Y. R.; Huang, C. Y.; Zhao, Yuji; Speck, J. S.

Nitride Semiconductor Light-Emitting Diodes (LEDs): Materials, Technologies and Applications. Elsevier Ltd., 2013. p. 250-275.

Research output: Chapter in Book/Report/Conference proceedingChapter

Wu, YR, Huang, CY, Zhao, Y & Speck, JS 2013, Nonpolar and semipolar LEDs. in Nitride Semiconductor Light-Emitting Diodes (LEDs): Materials, Technologies and Applications. Elsevier Ltd., pp. 250-275. https://doi.org/10.1533/9780857099303.1.250
Wu YR, Huang CY, Zhao Y, Speck JS. Nonpolar and semipolar LEDs. In Nitride Semiconductor Light-Emitting Diodes (LEDs): Materials, Technologies and Applications. Elsevier Ltd. 2013. p. 250-275 https://doi.org/10.1533/9780857099303.1.250
Wu, Y. R. ; Huang, C. Y. ; Zhao, Yuji ; Speck, J. S. / Nonpolar and semipolar LEDs. Nitride Semiconductor Light-Emitting Diodes (LEDs): Materials, Technologies and Applications. Elsevier Ltd., 2013. pp. 250-275
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