PbS nanocrystals (diameter of 5-7 nm) were synthesized via sulfur ion implantation in Pb-based glasses and postannealing. They display strong emission at around 1.5 mu m due to quantum confinement, and a very large photoluminescence (PL) excitation cross section. The PL intensity and decay rate temperature dependences provide evidence for a large energy splitting (ca. 30 meV) of the emitting exciton ground state fine structure, presumably due to the complex PbS electronic band structure. (c) 2006 American Institute of Physics.
Evidence for a 'dark exciton' state of PbS nanocrystals in a silicate glass
Priolo F
2006
Abstract
PbS nanocrystals (diameter of 5-7 nm) were synthesized via sulfur ion implantation in Pb-based glasses and postannealing. They display strong emission at around 1.5 mu m due to quantum confinement, and a very large photoluminescence (PL) excitation cross section. The PL intensity and decay rate temperature dependences provide evidence for a large energy splitting (ca. 30 meV) of the emitting exciton ground state fine structure, presumably due to the complex PbS electronic band structure. (c) 2006 American Institute of Physics.File in questo prodotto:
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