Thermally robust and blinking suppressed core/graded-shell CdSe/CdSe 1-xSx/CdS 'giant' multishell semiconductor nanocrystals

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We demonstrate that core/graded-shell CdSe/CdSe1-xS x/CdS giant semiconductor nanocrystals (g-NCs) have robust photoluminescence (PL) temperature response. At a size of 10.2 nm in diameter, these g-NCs undergo a PL drop of only 30% at 355 K relative to their PL intensity at 85 K. In comparison, the core/step-shell CdSe/CdS g-NCs at the same diameter exhibit 80% PL drop at 355 K. Spectral shifting and broadening were found to be, respectively, 5-10 times and 2-4 times smaller than those observed in standard CdSe core and CdSe/CdS core/shell NCs. These core/graded-shell g-NCs are largely blinking suppressed and have insignificant photoluminescence decay even after excitation at very high irradiance (44 kW cm-2) for over an hour. These types of g-NC have potential applications as the active medium for thermally robust laser devices (in the visible range) or as temperature-insensitive bioprobes for biomedical imaging.

Original languageEnglish (US)
Article number475705
JournalNanotechnology
Volume24
Issue number47
DOIs
Publication statusPublished - Nov 29 2013

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)