skip to main content

SciTech ConnectSciTech Connect

Title: Temperature dependence of the fundamental excitonic resonance in lead-salt quantum dots

The temperature dependences of the fundamental excitonic resonance in PbS and PbSe quantum dots fabricated by various technologies are experimentally determined. Above ∼150 K, sub-linearities of the temperature shifts and halfwidths are observed. This behavior is analyzed within the existing standard models. Concordant modeling, however, becomes possible only within the frame of a three-level system that takes into account both bright and dark excitonic states as well as phonon-assisted carrier redistribution between these states. Our results show that luminescence characterization of lead-salt quantum dots necessarily requires both low temperatures and excitation densities in order to provide reliable ensemble parameters.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [6]
  1. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, 500 Dongchuan Rd, Shanghai 200241 (China)
  2. (Germany)
  3. Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Str. 2A, 12489 Berlin (Germany)
  4. Institut für Angewandte Photonik e.V. Rudower Chaussee 29/31, 12489 Berlin (Germany)
  5. Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62210, Mexico and Ullrich Photoincs LLC, Wayne, Ohio 43466 (United States)
  6. (China)
Publication Date:
OSTI Identifier:
22483181
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARRIERS; DENSITY; EXCITATION; LEAD SELENIDES; LEAD SULFIDES; LUMINESCENCE; PHONONS; QUANTUM DOTS; RESONANCE; SALTS; SIMULATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K