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Toward RGB LEDs based on rare earth-doped ZnO.

J L Frieiro1,2, C Guillaume3, J López-Vidrier1,2

  • 1MIND, Departament d'Enginyeria Electrònica i Biomèdica, Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Spain.

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|September 3, 2020
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Summary
This summary is machine-generated.

Researchers developed monochromatic blue, green, and red light-emitting diodes (LEDs) using doped zinc oxide (ZnO) thin films. These efficient ZnO-based LEDs offer a promising platform for integrated red-green-blue emission compatible with silicon technology.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Zinc oxide (ZnO) is a wide-bandgap semiconductor with excellent optical and electrical properties.
  • Rare-earth ion doping is a key strategy for achieving efficient light emission in semiconductor materials.

Purpose of the Study:

  • To develop monochromatic light-emitting devices (LEDs) using rare-earth doped ZnO thin films.
  • To investigate the potential of ZnO as a host material for efficient electroluminescence.
  • To demonstrate integrated red-green-blue (RGB) emission using a simple device structure.

Main Methods:

  • Radiofrequency magnetron sputtering was used to deposit ZnO thin films doped with Cerium (Ce), Terbium (Tb), and Europium (Eu).
  • Structural characterization of the doped ZnO layers was performed.
  • Device fabrication, electrical, and optical characterization, including electroluminescence measurements, were conducted.

Main Results:

  • Monochromatic blue, green, and red light emission was achieved using Ce, Tb, and Eu doped ZnO LEDs, respectively.
  • Doping rates below 2% resulted in narrow and intense emission peaks due to electronic transitions.
  • The fabricated devices exhibited intense electroluminescence, with ZnO serving as an effective transparent electrode.

Conclusions:

  • ZnO is a suitable host material for rare-earth ions, enabling efficient electroluminescence.
  • The developed ZnO-based LEDs are compatible with silicon technology.
  • The study presents a foundation for integrated RGB emission devices based on doped ZnO.