Transient photoluminescence and simultaneous amplified spontaneous emission from multiexciton states inCdSequantum dots

This is the authors' abstract. We don't add key points for this paper.

We use transient photoluminescence to spectrally resolve the emission from 1, 2, and 3 electron-hole pairs states in CdSe colloidal quantum dots with radii ranging between 2.3 and 5.20.3em0exnm. The power dependence of the triexciton, biexciton and single exciton emission intensities are reported. We incorporate CdSe∕ZnS core-shell nanocrystals into a TiO₂ host matrix and observe simultaneous amplified spontaneous emission from the 1S3∕2-1Se and 1P3∕2-1Pₑ quantum dot transitions. The achievement of amplified spontaneous emission from the 1Pₑ QD state suggests that the 1Pₑ state sixfold degeneracy might be lifted by the e-h exchange interaction.