Low-voltage CMOS/BiCMOS light emitting devices

Monuko Du Plessis, Herzl Aharoni, Lukas W. Snyman

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Low-voltage Si-LED operation can be achieved by fabricating devices with heavily doped n+p+ junctions. Differences are observed between high-voltage avalanche and low-voltage field emission LED performance. The low-voltage devices exhibit a non-linear light intensity L vs. reverse current I relationship at low current levels, but a linear dependency at higher currents, compared to the linear behavior of avalanche devices at all current levels. Three regions of operation are identified for the low-voltage field emission LED's, namely L ∝ I3 at low currents, L ∝ I 2 at medium currents and eventually L ∝ I at higher currents. In the low-voltage non-linear region of operation, the shape of the emitted spectrum changes with reverse current. At low reverse current the field emission devices emit more long wavelength radiation than short wavelength radiation. As the reverse current increases, the short wavelength radiation increases relative to the long wavelength radiation, and at higher currents in the linear region of operation the ratio between long and short wavelength radiation remains constant.

Original languageEnglish
Title of host publicationCOMMAD04 - 2004 Conference on Optoelectronic and Microelectronic Materials and Devices -Proceedings
Number of pages4
StatePublished - 1 Dec 2005
Externally publishedYes
EventCOMMAD04 - 2004 Conference on Optoelectronic and Microelectronic Materials and Devices - Bribane, QLD, Australia
Duration: 8 Dec 200410 Dec 2004

Publication series

NameConference on Optoelectronic and Microelectronic Materials and Devices, Proceedings, COMMAD


ConferenceCOMMAD04 - 2004 Conference on Optoelectronic and Microelectronic Materials and Devices
CityBribane, QLD


  • Electroluminescence
  • Light emitting device
  • Silicon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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