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| - Radiative Recombination of Triexcitons in CdSe Colloidal Quantum Dots
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| - Recent experimental observations of multiexciton recombination in colloidal CdSe quantum dots have revealeda high-energy emission band that has been attributed to the radiative recombination of a p-like electron witha p-like hole in a triexciton complex (three holes + three electrons). The reason for the occupation of p-likehole states in the triexciton, however, has remained elusive. Using atomistic pseudopotential calculations, weshow here that p-like hole states are populated even at low temperature because of the relatively small Coulombrepulsion between s-like and p-like hole states, which leads to a non-Aufbau occupation sequence of the holelevels. We also show that the observed temperature dependence of the p−p emission band originates fromthe dark−bright splitting of the triexciton ground state. Our results provide a consistent explanation of thephysical origin of the triexciton emission lines in CdSe quantum dots.
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