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摘要
The photoluminescence (PL) lifetime of PbSe colloidal quantum dots (QDs) is investigated. At room temperature, the surface ligands have a dominant effect on the PL lifetime of PbSe nanocrystals emitting photon with energy between 0.55 and 0.72 eV. Above 0.75 eV, the decay rate follows approximately a linear relationship with PL energy. At low temperature, the lifetime increases from 200 ns to nearly 1 mu s, but the PL efficiency does not increase significantly. The model of dipole energy transfer to the ligands vibrations accounts rather well for the observations.
- 出版日期2010-9-9
