We have investigated the effect of water (H 2 O) cooling and heat treatment on the luminescence efficiency of core CdSe quantum dots (QDs). The photoluminescence (PL) quantum yield of the CdSe QDs was enhanced up to ∼85%, and some periodic bright points were observed in wide color ranges during the heat treatment of QDs mixed with H 2 O. The PL enhancement of QDs could be attributed to the recovery of QDs surface traps by unreacted ligands confined within the hydrophilic H 2 O molecule containers.
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