Fluorescence relaxation dynamics of CdSe and CdSe/CdS core/shell quantum dots

Journal Article · Thu Apr 24 04:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4872624· OSTI ID:22269478

Kaur, Gurvir; Kaur, Harmandeep ^[1]

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1. Centre of Advanced Study in Physics, Department of Physics, Panjab University, Chandigarh-160014 (India)

Time-resolved fluorescence spectra for colloidal CdSe and CdSe/CdS core/shell quantum dots have been investigated to know their electron relaxation dynamics at the maximum steady state fluorescence intensity. CdSe core and CdSe/CdS type I core-shell materials with different shell (CdS) thicknesses have been synthesized using mercaptoacetic acid as a capping agent. Steady state absorption and emission studies confirmed successful synthesis of CdSe and CdSe/CdS core-shell quantum dots. The fluorescence shows a tri-exponential decay with lifetimes 57.39, 7.82 and 0.96 ns for CdSe quantum dots. The lifetime of each recombination decreased with growth of CdS shell over the CdSe core, with maximum contribution to fluorescence by the fastest transition.

• OSTI ID: 22269478
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1591; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CADMIUM SELENIDES
CADMIUM SULFIDES
ELECTRONS
EMISSION SPECTRA
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
INTERFACES
LIFETIME
QUANTUM DOTS
RECOMBINATION
RELAXATION
SYNTHESIS
TIME RESOLUTION