Abstract
The optical and electronic properties of CdSe/ZnS nanocrystal quantum dots (NQDs) show a strong size and shape dependence. NQDs have a high ratio of surface to volume and the surface of NQDs prepared with a chemical method has a complex condition due to organic ligands. Therefore, the complex surface condition of colloidal NQDs plays an important role in determining quantum yield (QY), carrier relaxation, and recombination process. The asymmetric crystal field and electron‐hole exchange interaction in CdSe splits the lowest exciton state, (1se‐1s2/3h), into five levels which includes the ‘dark’ and ‘bright’ exciton states.CdSe NQDs are synthesized in wurtzite structure using the chemical colloidal method in this study. CdSe NQDs are prepared as having various surface conditions, which induces QY to be changed. The photoluminescence and time resolved spectra are obtained over a broad temperature range (4 ∼ 300 K). The dark and bright exciton states are observed at a low temperature regime.
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