Efficient free exciton emission at room temperature in Zn 0.5Cd0.5Se/MgxZnyCd 1-x-ySe quantum wells

O. Maksimov, N. Samarth, H. Lu, Martin Muñoz, M. C. Tamargo

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We use temperature and power-dependent photoluminescence spectroscopy to demonstrate efficient free exciton emission at room temperature in high quality, strongly confining Zn0.5Cd0.5Se/MgxZn yCd1-x-ySe quantum wells. Our measurements indicate that at low temperatures (T<50 K), the luminescence is dominated by bound exciton emission. However, free exciton emission becomes dominant at high temperatures (T> 100 K) and persists up to room temperature with an intensity that is ∼40% that at cryogenic temperatures. We attribute these observations to the deep confinement potential that stabilizes excitons and prevents their thermal escape.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalSolid State Communications
Issue number1
StatePublished - Oct 2004

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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