Hysteretic photochromic switching (HPS) in doubly doped GaN(Mg):Eu—a summary of recent results

Paul R. Edwards, Kevin P. O'Donnell, Akhilesh K. Singh, Douglas Cameron, Katharina Lorenz, Mitsuo Yamaga, Jacob H. Leach, Menno J. Kappers, Michal Boćkowski

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Abstract

Europium is the most-studied and least-well-understood rare earth ion (REI) dopant in GaN. While attempting to increase the efficiency of red GaN light-emitting diodes (LEDs) by implanting Eu+ into p-type GaN templates, the Strathclyde University group, in collaboration with IST Lisbon and Unipress Warsaw, discovered hysteretic photochromic switching (HPS) in the photoluminescence spectrum of doubly doped GaN(Mg):Eu. Our recent work, summarised in this contribution, has used time-, temperature- and light-induced changes in the Eu intra-4f shell emission spectrum to deduce the microscopic nature of the Mg-Eu defects that form in this material. As well as shedding light on the Mg acceptor in GaN, we propose a possible role for these emission centres in quantum information and computing.
Original languageEnglish
Article number1800
Number of pages9
JournalMaterials
Volume11
Issue number10
DOIs
Publication statusPublished - 22 Sep 2018

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Keywords

  • gallium nitride
  • rare earth ions
  • europium
  • photoluminescence
  • photochromism
  • qubit

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