Abstract
In this work, we used an oil phase method to synthesize Eu3+-doped CdSe nanocrystals (NCs), which were characterized extensively with X-ray powder diffraction (XRD), transmission electron microscopy (TEM), UV–visible (UV–vis) absorption and emission. The CdSe:Eu NCs were monodispersed and uniform spherical nanocrystals with a cubic structure resembling CdSe NCs. The particle diameter depended on the content of the Eu3+ dopant and ranged from 5.57to 4.27 nm, respectively. The CdSe:Eu NCs containing 20 mol% Eu3+ (denoted as a-20) has a 31nm blueshift in absorption and a 25 nm blueshift in emission with comparison to the pure CdSe NCs. The efficiency of energy transfer from CdSe to Eu3+ can be calculated from the variation of fluorescence lifetime to be 22%. The quantum yield (QY) of the CdSe:Eu NCs is the highest when the concentration of the Eu3+ dopant is 20 mol%. High reaction temperature and charge compensation can effectively improve the QY of the CdSe:Eu NCs.
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