publication . Other literature type . Article . 2003

Single-step synthesis to control the photoluminescence quantum yield and size dispersion of CdSe nanocrystals

Stephen G. Hickey; Celso de Mello Donega;
Open Access
  • Published: 25 Mar 2003
  • Publisher: American Chemical Society (ACS)
  • Country: Netherlands
Abstract
A comprehensive investigation is presented on the factors governing the photoluminescence (PL) quantum yields (QYs) and size dispersion of colloidal CdSe nanocrystals. The temporal evolution of the ensemble PL properties (absorption and luminescence spectra, QYs and lifetimes) during growth at different temperatures (170−310 °C) and different Cd:Se ratios was followed for several hours (2−6 h). The QY values increase during the growth to a maximum and, after a variable time interval (from minutes to hours, depending on the growth temperature), decrease gradually. Low QYs are due to poor passivation, surface disorder, and surface degradation, which arise at diffe...
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