Time-dependent photoluminescence blue shift of the quantum dots in living cells: effect of oxidation by singlet oxygen

J Am Chem Soc. 2006 Oct 18;128(41):13396-401. doi: 10.1021/ja061225y.

Abstract

Time-dependent photoluminescence (PL) enhancement, blue shift, and photobleach were observed from the thiol-capped CdTe quantum dots (QDs) ingested in mouse myoblast cells and human primary liver cancer cells. It was revealed that the PL blue shift resulted from the photooxidation of the QD core by singlet oxygen molecules formed on the QD core surface.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biosensing Techniques / methods*
  • Cadmium Compounds / chemistry*
  • Cell Line, Tumor
  • Humans
  • Image Enhancement
  • Liver / cytology
  • Liver / pathology
  • Luminescence*
  • Mice
  • Myoblasts / cytology
  • Myoblasts / pathology
  • Oxidation-Reduction
  • Photobleaching
  • Quantum Dots*
  • Singlet Oxygen / chemistry*
  • Spectrum Analysis
  • Tellurium / chemistry*
  • Time Factors

Substances

  • Cadmium Compounds
  • Singlet Oxygen
  • Tellurium
  • cadmium telluride