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Keywords:

  • semiconductor nanocrystals;
  • II-VI quantum dots;
  • cadmium chalcogenides;
  • quasi-type II;
  • lasing
Thumbnail image of graphical abstract

By careful engineering of the core and shell dimensions in CdSe/CdS colloidal hetero-nanocrystals, amplified spontaneous emission can be triggered from either the core, shell, or both states simultaneously. The ASE threshold is almost constant over a temperature interval of 5–325 K. This feature is unique to quantum dots and highlights their potential as a gain material, suitable for lasing at elevated temperatures.