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

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.
Authors:
;  [1] ;  [2]
  1. Centre of Advanced Study in Physics, Department of Physics, Panjab University, Chandigarh-160014 (India)
  2. Centre of Advanced Study in Physics, Panjab University, Chandigarh- 160014 (India)
Publication Date:
OSTI Identifier:
22269478
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CADMIUM SELENIDES; CADMIUM SULFIDES; ELECTRONS; EMISSION SPECTRA; FLUORESCENCE; FLUORESCENCE SPECTROSCOPY; INTERFACES; LIFETIME; QUANTUM DOTS; RECOMBINATION; RELAXATION; SYNTHESIS; TIME RESOLUTION