Indirect Exciton Formation due to Inhibited Carrier Thermalization in Single CdSe/CdS Nanocrystals.
Temperature-dependent single-particle spectroscopy is used to study interfacial energy transfer in model light-harvesting CdSe/CdS core-shell tetrapod nanocrystals. Using alternating excitation energies, we identify two thermalized exciton states in single nanoparticles that are attributed to a strain-induced interfacial barrier. At cryogenic temperatures, emission from both states exemplifies the effects of intraparticle disorder and enables their simultaneous characterization, revealing that the two states are distinct in regards to emission polarization, spectral diffusion, and blinking.
Eyal
E
Shafran
Nicholas J
NJ
Borys
‡Department of Chemistry, The University of Chicago, Chicago, Illinois 610637, United States.
Jing
J
Huang
‡Department of Chemistry, The University of Chicago, Chicago, Illinois 610637, United States.
Dmitri V
DV
Talapin
§Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93053 Regensburg, Germany.
John M
JM
Lupton
CdSe/CdS nanocrystals; indirect excitons; nanocrystal tetrapods; quantum dots; single-particle microscopy; temperature dependence