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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Ultra Long-Lived Radiative Trap States in CdSe Quantum Dots

Author

  • Mohamed Qenawy
  • Khadga Jung Karki
  • Nils Lenngren
  • Kaibo Zheng
  • Torbjörn Pascher
  • Arkady Yartsev
  • Tönu Pullerits

Summary, in English

Surface states and traps play an important role in the photophysics of colloidal quantum dots. These states typically lead to large red-shifted photoluminescence. We have used steady-state and time-resolved spectroscopic techniques to investigate the nature of the traps and their lifetimes in colloidal CdSe quantum dots. We conclude that at least two different types of traps contribute to the photoluminescence. The trapping is more pronounced at higher excitation energies compared to the band edge excitation. Hole trapping is dominant in CdSe quantum dots. The time-resolved photoluminescence and pump–probe measurements show that the trapped holes live for longer than tens of microseconds at room temperature.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2014

Language

English

Pages

21682-21686

Publication/Series

Journal of Physical Chemistry C

Volume

118

Issue

37

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Atom and Molecular Physics and Optics

Status

Published

Research group

  • Pullerits

ISBN/ISSN/Other

  • ISSN: 1932-7447