Evaluation of defects in cuprous oxide through exciton luminescence imaging

Laszlo Frazer, Erik J. Lenferink, Kelvin B. Chang, Kenneth R. Poeppelmeier, Nathaniel P. Stern, John B. Ketterson

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The various decay mechanisms of excitons in cuprous oxide (Cu2O) are highly sensitive to defects which can relax selection rules. Here we report cryogenic hyperspectral imaging of exciton luminescence from cuprous oxide crystals grown via the floating zone method showing that the samples have few defects. Some locations, however, show strain splitting of the 1s orthoexciton triplet polariton luminescence. Strain is reduced by annealing. In addition, annealing causes annihilation of oxygen and copper vacancies, which leads to a negative correlation between luminescence of unlike vacancies.

Original languageEnglish
Pages (from-to)294-302
Number of pages9
JournalJournal of Luminescence
Volume159
DOIs
Publication statusPublished - Mar 2015

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Keywords

  • CuO
  • Cuprous oxide
  • Excitons
  • Hyperspectral imaging
  • Stress
  • Vacancies

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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