CdSe/ZnS Colloidal Quantum Dots with Alloyed Core/Shell Interfaces: A Photoluminescence Dynamics Study

Abstract

Time-resolved photon counting technique was employed to study dynamics of photoluminescence from the ensemble and single CdSe/ZnS quantum dots with the alloyed core/shell interfaces. The ensemble data revealed enhanced effect of disorder-induced trap states for increasing emission energy, as implied from the changes in the distribution of total decay rates. The emission trajectories collected for single quantum dots showed familiar, two-state blinking pattern. It suggests that in a large-band-offset CdSe/ZnS system, the introduced alloying of the core-to-shell region cannot smooth enough the confinement potential in order to suppress nonradiative Auger recombination and blinking.

Nucleotide insertion initiated by van der Waals interaction during polymerase beta DNA replication

“…[22][23][24] Further experimental supports for IET and its applications can be found here. [25][26][27][28][29][30][31][32][33] Moreover, the importance of ionic valence states on the electronic transport properties of oxides and magnetic semiconductors was first experimentally proven by Mahendiran et al, 34 the computational (using the Density Functional Theory) proof was given by Mahadevan and Zunger, 35 while the theoretical proofs (using IET) have been developed in ref. 36.…”

Multiplexed measurements by time resolved spectroscopy using colloidal CdSe/ZnS quantum dots

“…The origin of the feeding states has been discussed being either the triplet exciton state 28,29 or trap states at the interface to the inorganic shell. 30,31 The blue triangles depicted in Fig. 2 give the PL time behavior of the dye molecules bound to the CdSe/ZnS QDs.…”

Nucleotide insertion initiated by van der Waals interaction during polymerase beta DNA replication

“…This energy-level spacing renormalization procedure can be related exactly to the Shankar renormalization technique within the screened Coulomb potential derivation, and his renormalization method is documented here [22,23,24]. Further experimental supports for IET and its applications can be found here [25,26,27,28,29,30,31,32,33].…”