title: Anomalous size-dependent decay of low-energy luminescence from PbS quantum dots in colloidal solution.
abstract: We report on an anomalous size dependence of the room-temperature photoluminescence decay time from the lowest-energy state of PbS quantum dots in colloidal solution, which was found using the transient luminescence spectroscopy. The observed 10-fold reduction in the decay time (from ~2.5 to 0.25 μs) with the increase in the quantum dots' diameter is explained by the existence of phonon-induced transitions between the in-gap state-whose energy drastically depends on the diameter-and the fundamental state of the quantum dots.
authors.affiliation: National Research University of Informational Technologies, Mechanics and Optics, 197101 Saint Petersburg, Russia.
authors.forename: Elena V
authors.initials: EV
authors.lastname: Ushakova
authors.forename: Aleksandr P
authors.initials: AP
authors.lastname: Litvin
authors.forename: Peter S
authors.initials: PS
authors.lastname: Parfenov
authors.forename: Anatoly V
authors.initials: AV
authors.lastname: Fedorov
authors.forename: Mikhail
authors.initials: M
authors.lastname: Artemyev
authors.forename: Anatoly V
authors.initials: AV
authors.lastname: Prudnikau
authors.forename: Ivan D
authors.initials: ID
authors.lastname: Rukhlenko
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Baranov
mesh_terms: D003102:Colloids / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D012996:Solutions
chemical_list: D003102:Colloids; D018036:Selenium Compounds; D012996:Solutions; C088065:lead selenide; D007854:Lead