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Surface Chemically Switchable Ultraviolet Luminescence from Interfacial Two-Dimensional Electron Gas.

Mohammad A Islam, Diomedes Saldana-Greco1, Zongquan Gu

  • 1The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.

Nano Letters
|December 18, 2015
PubMed
Summary

We discovered switchable ultraviolet light emission from a 2D electron gas system. This novel surface chemisorption-activated luminescence offers new possibilities for optoelectronics and molecular sensing.

Keywords:
LaAlO3/SrTiO3Two-dimensional electron gaschemisorptionphotoluminescence

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Chemistry

Background:

  • LaAlO3/SrTiO3 interfaces host a two-dimensional electron gas (2DEG).
  • Photoluminescence in such systems is typically studied for fundamental understanding.
  • Controlling luminescence properties via surface interactions is an emerging area.

Purpose of the Study:

  • To investigate surface chemisorption-activated and reversible ultraviolet photoluminescence at LaAlO3/SrTiO3 interfaces.
  • To explore the mechanism behind switchable luminescence controlled by surface modification.
  • To establish a new model for surface chemically reconfigurable solid-state UV optoelectronics and molecular sensing.

Main Methods:

  • Fabrication of LaAlO3/SrTiO3 heterostructures.
  • Surface modification via hydrogen (H) chemisorption on the LaAlO3 surface.
  • Characterization of ultraviolet (UV) photoluminescence properties.
  • Analysis of electronic structure modifications driven by electron transfer.

Main Results:

  • Intense, narrow line-width, reversible UV photoluminescence was observed.
  • The luminescence originates from the radiative recombination of the 2DEG with photoexcited holes.
  • Switchable luminescence is attributed to electron transfer-driven electronic structure modification via H-chemisorption on the LaAlO3 surface.
  • Control over emission onset and intensity surpasses conventional quantum well luminescence.

Conclusions:

  • Surface chemisorption offers a novel pathway to control and reconfigure UV optoelectronic properties.
  • The findings suggest a new paradigm for developing surface chemically reconfigurable solid-state UV optoelectronics.
  • This approach holds promise for advanced molecular sensing applications.