Fluorescence spectroscopy of semiconductor CdTe nanocrystals: preparation effect on photostability

Bujak, Łukasz; Olejnik, Maria; Litvín, Radek; Piatkowski, Dawid; Kotov, Nicholas A.; Maćkowski, Sebastian

doi:10.2478/s11534-010-0128-3

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…For example, in time correlated single‐photon counting (TCSPC), the instrument's resolution is on the order of 25 ps with an instrumental deconvolution lifetime of a few ps. Other methodologies exist, involving luminescence upconversion,172 time‐resolved photoelectron spectroscopy,201 time resolved fluorescence,202 four‐wave mixing,203 and terahertz time‐domain spectroscopy 204…”

Section: Charge Carrier Dynamicsmentioning

confidence: 99%

Exciton Dynamics in Semiconductor Nanocrystals

2013

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This review article provides an overview of recent advances in the study and understanding of dynamics of excitons in semiconductor nanocrystals (NCs) or quantum dots (QDs). Emphasis is placed on the relationship between exciton dynamics and optical properties, both linear and nonlinear. We also focus on the unique aspects of exciton dynamics in semiconductor NCs as compared to those in bulk crystals. Various experimental techniques for probing exciton dynamics, particularly time-resolved laser methods, are reviewed. Relevant models and computational studies are also briefly presented. By comparing different materials systems, a unifying picture is proposed to account for the major dynamic features of excitons in semiconductor QDs. While the specific dynamic processes involved are material-dependent, key processes can be identified for all the materials that include electronic dephasing, intraband relaxation, trapping, and interband recombination of free and trapped charge carriers (electron and hole). Exciton dynamics play a critical role in the fundamental properties and functionalities of nanomaterials of interest for a variety of applications including optical detectors, solar energy conversion, lasers, and sensors. A better understanding of exciton dynamics in nanomaterials is thus important both fundamentally and technologically.

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Section: Charge Carrier Dynamicsmentioning

confidence: 99%

Exciton Dynamics in Semiconductor Nanocrystals

2013

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“…Applications of fluorescence spectroscopy are currently restricted to time- resolved fluorescence 15 , Förster resonance energy transfer (FRET) 16 , and fluorescence polarization 17 . However, these techniques often require the use of a dye to probe the samples, complicating the measurement as release or decay of the dye must be considered.…”

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confidence: 99%

Two-Dimensional Fluorescence Difference Spectroscopy to Characterize Nanoparticles and their Interactions

Hurst

Delong

2016

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Two dimensional fluorescence difference spectroscopy (2D FDS) detects nanoparticle interactions following surface functionalization and biomolecule loading by generating a spectral signature of the fluorescent intensity per excitation and emission wavelengths. Comparing metal oxide nanoparticles revealed a unique spectral signature per material composition. 2D FDS showed to be sensitive to changes in surface properties between ZnO NPs synthesized by different methods. ZnO NP loaded with glycol chitosan, polyacrylic acid (PAA), or methoxy polyethylene glycol (mPEG) exhibited a distinct spectral signature shift. ZnO NP loaded with Torula Yeast RNA (TYRNA)(640 nm), polyinosinic: polycytidylic acid (pIC)(680 nm), or splice switching oligonucleotide (SSO)(650 nm) each revealed a shift in emission. Ras-Binding domain (RBD) at three concentrations (25, 37.5, 50 μg/mL) showed that fluorescent intensity was inversely related to the concentration of protein loaded. These data support 2D FDS as a novel technique in identifying nanoparticles and their surface interactions as a quality assurance tool.

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Fluorescence spectroscopy of semiconductor CdTe nanocrystals: preparation effect on photostability

Cited by 2 publications

References 15 publications

Exciton Dynamics in Semiconductor Nanocrystals

Exciton Dynamics in Semiconductor Nanocrystals

Two-Dimensional Fluorescence Difference Spectroscopy to Characterize Nanoparticles and their Interactions

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