title: Optical and electrical measurement of energy transfer between nanocrystalline quantum dots and photosystem I.
abstract: In the natural photosynthesis process, light harvesting complexes (LHCs) absorb light and pass excitation energy to photosystem I (PSI) and photosystem II (PSII). In this study, we have used nanocrystalline quantum dots (NQDs) as an artificial LHC by integrating them with PSI to extend their spectral range. We have performed photoluminescence (PL) and ultrafast time-resolved absorption measurements to investigate this process. Our PL experiments showed that emission from the NQDs is quenched, and the fluorescence from PSI is enhanced. Transient absorption and bleaching results can be explained by fluorescence resonance energy transfer (FRET) from the NQDs to the PSI. This nonradiative energy transfer occurs in ∼6 ps. Current-voltage (I-V) measurements on the composite NQD-PSI samples demonstrate a clear photoresponse.
authors.affiliation: Department of Electrical Engineering, University of Illinois at Chicago, Illinois 60607, USA.
authors.forename: Hyeson
authors.initials: H
authors.lastname: Jung
authors.forename: Galina
authors.initials: G
authors.lastname: Gulis
authors.forename: Subhadra
authors.initials: S
authors.lastname: Gupta
authors.forename: Kevin
authors.initials: K
authors.lastname: Redding
authors.forename: David J
authors.initials: DJ
authors.lastname: Gosztola
authors.forename: Gary P
authors.initials: GP
authors.lastname: Wiederrecht
authors.forename: Michael A
authors.initials: MA
authors.lastname: Stroscio
authors.forename: Mitra
authors.initials: M
authors.lastname: Dutta
mesh_terms: D000042:Absorption; D040761:Biomimetic Materials / Q000737:chemistry / Q000378:metabolism; D016825:Chlamydomonas reinhardtii / Q000201:enzymology; D004579:Electron Transport; D004735:Energy Transfer; D031541:Fluorescence Resonance Energy Transfer; D008027:Light; D055620:Optical Phenomena; D045331:Photosystem I Protein Complex / Q000737:chemistry* / Q000378:metabolism; D045663:Quantum Dots
chemical_list: D045331:Photosystem I Protein Complex