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Title: Photoinduced band filling in strongly confined colloidal PbS quantum dots

Increase in continuous wave laser excitation (6 W/cm{sup 2} to 120 W/cm{sup 2}) of colloidal PbS quantum dots in the strongly quantized regime (diameters 2.0 nm and 4.7 nm) deposited on semi-insulating GaAs and glass causes a clear blue shift (0.019 eV and 0.080 eV) of the emission spectra. Proof of the applicability of a dynamic three-dimensional band filling model is the significance of the presented results and demonstrates the effective electronic coupling in quantum dot arrays similar to superlattices. The work also reveals the influence of quantum dot sizes on photo-doping effects.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62210 (Mexico)
  2. (United States)
  3. Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Ohio 43403-0209 (United States)
  4. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright Patterson AFB, Ohio 45433-7707 (United States)
Publication Date:
OSTI Identifier:
22303984
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COUPLING; EMISSION SPECTRA; EXCITATION; GALLIUM ARSENIDES; GLASS; LASER RADIATION; LEAD SULFIDES; QUANTUM DOTS; SUPERLATTICES