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Evidence for a "dark exciton" state of PbS nanocrystals in a silicate glass

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 µm 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.
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http://hal.in2p3.fr/in2p3-00077624
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Submitted on : Wednesday, May 31, 2006 - 2:42:41 PM
Last modification on : Wednesday, September 16, 2020 - 4:17:41 PM

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R. Espiau de Lamaëstre, H. Bernas, D. Pacifici, G. Franzo, F. Priolo. Evidence for a "dark exciton" state of PbS nanocrystals in a silicate glass. Applied Physics Letters, American Institute of Physics, 2006, 88, pp.181115. ⟨10.1063/1.2201885⟩. ⟨in2p3-00077624⟩

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