Colloidal quantum dots as saturable fluorophores

Osip Schwartz, Ron Tenne, Jonathan M. Levitt, Zvicka Deutsch, Stella Itzhakov, Dan Oron

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Although colloidal quantum dots (QDs) exhibit excellent photostability under mild excitation, intense illumination makes their emission increasingly intermittent, eventually leading to photobleaching. We study fluorescence of two commonly used types of QDs under pulsed excitation with varying power and repetition rate. The photostability of QDs is found to improve dramatically at low repetition rates, allowing for prolonged optical saturation of QDs without apparent photodamage. This observation suggests that QD blinking is facilitated by absorption of light in a transient state with a microsecond decay time. Enhanced photostability of generic quantum dots under intense illumination opens up new prospects for fluorescence microscopy and spectroscopy.

Original languageEnglish
Pages (from-to)8778-8782
Number of pages5
JournalACS nano
Issue number10
Publication statusPublished - Oct 23 2012


  • fluorophore photostability
  • quantum dot blinking
  • saturable fluorescence

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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