Luminescence of nanocrystalline ZnS: Cu2+

Ageeth A. Bol, Joke Ferwerda, Jaap A. Bergwerff, Andries Meijerink

Research output: Contribution to journalArticleAcademicpeer-review

198 Citations (Scopus)

Abstract

Temperature dependent luminescence and luminescence lifetime measurements are reported for nanocrystalline ZnS:Cu2+ particles. Based on the variation of the emission wavelength as a function of particle size (between 3.1 and 7.4 nm) and the low quenching temperature (Tq = 135 K), the green emission band is assigned to recombination of an electron in a shallow trap and Cu2+. The reduction in lifetime of the green emission (from 20 μs at 4 K to 0.5 μs at 300 K) follows the temperature quenching of the emission. In addition to the green luminescence, a red emission band, previously only reported for bulk ZnS:Cu2+, is observed. The red emission is assigned to recombination of a deeply trapped electron and Cu2+. The lifetime of the red emission is longer (about 40 μs at 4 K) and the quenching temperature is higher.

Original languageEnglish
Pages (from-to)325-334
Number of pages10
JournalJournal of Luminescence
Volume99
Issue number4
DOIs
Publication statusPublished - 1 Nov 2002
Externally publishedYes

Keywords

  • Nanocrystals
  • Time resolved spectroscopy
  • Zns:Cu

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