Naslov
Spectral and dynamical characterization of multiexcitons in colloidal CdSe semiconductor quantum dots

Autori
Bonati, Camilla ; Mohamed, B. Mona ; Tonti, Dino ; Zgrablić, Goran ; Haacke, Stefan ; van Mourik, Frank ; Chergui, Majed

Izvornik
Physical Review B (1098-0121) 71 (2005), 20; 205317-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
exciton ; upconversion ; femtosecond photoluminescence ; quantum dots

Sažetak
Femtosecond photoluminescence (PL) up-conversion studies in polychromatic mode and laser-power-dependence studies of the PL were carried out on colloidal solutions of CdSe quantum dots with diameters ranging from 2.4 to 4 nm. The main features of the spectra consist, in addition to the band-gap luminescence, of three bands, one 120-130 meV and another 30-40 meV at low energy to the band-gap luminescence, while the third lies 220-260 meV higher in energy. The first band is attributed to a positively charged biexciton and the second to a neutral biexciton, while the blue band is attributed to a neutral triexciton. These assignments are based on the energetics, the lifetimes, and the pump-power dependence of the various bands. The energetics and lifetimes are in good agreement with the theoretical studies present in literature.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA