Journal ArticleDOI
Acceptor Concentration Dependence of Förster Resonance Energy Transfer Dynamics in Dye–Quantum Dot Complexes
TLDR
In this article, the photoinduced Forster resonance energy transfer (FRET) in a perylene diimide-quantum dot organic-inorganic hybrid system has been investigated by femtosecond time-resolved absorption spectroscopy.Abstract:
The dynamics of the photoinduced Forster resonance energy transfer (FRET) in a perylene diimide–quantum dot organic–inorganic hybrid system has been investigated by femtosecond time-resolved absorption spectroscopy. The bidentate binding of the dye acceptor molecules to the surface of CdSe/CdS/ZnS multishell quantum dots provides a well-defined dye-QD geometry for which the efficiency of the energy transfer reaction can be easily tuned by the acceptor concentration. In the experiments, the spectral characteristics of the chosen FRET pair facilitate a selective photoexcitation of the quantum dot donor. Moreover, the acceptor related transient absorption change that occurs solely after energy transfer is utilized for the determination of the energy transfer dynamics. Our time-resolved measurements demonstrate that an increase of the acceptor concentration accelerates the donor–acceptor energy transfer. Considering a Poisson distribution of acceptor molecules per quantum dot, the dependence of the energy tra...read more
Citations
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Journal ArticleDOI
Linking surface chemistry to optical properties of semiconductor nanocrystals
TL;DR: This perspective aims to re-evaluate long held ideas in semiconductor nanocrystal surface science in the light of a body of new and rich research, by reviewing recent developments in ligand chemistry, followed by a discussion of spectroscopic and computational approaches used for advancing the poorly-understood electronic structure of the surface.
Journal ArticleDOI
Chlorin e6-ZnSe/ZnS quantum dots based system as reagent for photodynamic therapy
Irina V. Martynenko,Vera Kuznetsova,А O Orlova,P A Kanaev,Vladimir G. Maslov,Alexander Loudon,V Zaharov,Peter S. Parfenov,Yu. K. Gun’ko,Yu. K. Gun’ko,Alexander V. Baranov,Anatoly V. Fedorov +11 more
TL;DR: It was shown that the PDT effect was significantly increased due to two factors: the efficient QD-chlorin e6 photoexcitation energy transfer and the improvement of cellular uptake of the photosensitizer in the presence of ZnSe/ZnS QDs.
Journal ArticleDOI
Size-Dependent Energy Transfer Pathways in CdSe Quantum Dot–Squaraine Light-Harvesting Assemblies: Förster versus Dexter
TL;DR: In this paper, a short thiol functional group (SQSH) was linked to a red-infrared-absorbing squaraine dye through steady-state and time-resolved spectroscopy experiments to explore both mechanisms.
Journal ArticleDOI
Tuning Electronic States of a CdSe/ZnS Quantum Dot by Only One Functional Dye Molecule
Eduard I. Zenkevich,Aleksander P Stupak,Clemens Göhler,Cornelius Krasselt,Christian von Borczyskowski +4 more
TL;DR: Time-resolved PL spectroscopy in combination with spectral deconvolution reveals that surface properties of QDs are a complex interplay of the nature of the dye molecule and the topography of the ligand layer across a temperature range from 77 to 290 K.
Journal ArticleDOI
Dynamics of Energy Transfer from CdSe Nanocrystals to Triplet States of Anthracene Ligand Molecules
TL;DR: HuHuang et al. as discussed by the authors used time-resolved photoluminescence measurements to characterize the kinetics of the energy transfer from the CdSe exciton state to the triplet state of the anthracene ligand.
References
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Journal ArticleDOI
Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites
TL;DR: In this paper, a simple route to the production of high-quality CdE (E=S, Se, Te) semiconductor nanocrystallites is presented, based on pyrolysis of organometallic reagents by injection into a hot coordinating solvent.
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Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals
TL;DR: In this article, the extinction coefficient per mole of nanocrystals at the first exitonic absorption peak, e.g., for high-quality CdTe, CdSe, and CdS, was found to be strongly dependent on the size of the nanocrystal, between a square and a cubic dependence.
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Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.
Journal Article
Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer
TL;DR: In this article, a hybrid organic/inorganic electroluminescent device was constructed based on the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV) with electrons injected into the multilayer film of cadmium selenide nanocrystals.
Journal ArticleDOI
Optical gain and stimulated emission in nanocrystal quantum dots.
Victor I. Klimov,Alexander Mikhailovsky,S. Xu,Anton V. Malko,Jennifer A. Hollingsworth,C. A. Leatherdale,H.-J. Eisler,Moungi G. Bawendi +7 more
TL;DR: In this article, the authors examined the competing dynamical processes involved in optical amplification and lasing in nanocrystal quantum dots and found that, despite a highly efficient intrinsic nonradiative Auger recombination, large optical gain can be developed at the wavelength of the emitting transition for close-packed solids of these dots.