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Title: Nonradiative recombination of excitons in semimagnetic quantum dots

The mechanisms of the nonradiative recombination of excitons in neutral and charged quantum dots based on II–VI semimagnetic semiconductors are investigated. It is shown that, along with the dipole–dipole and direct-exchange mechanisms, there is one more mechanism referred to as the indirect-exchange mechanism and related to sp–d mixing. The selection rules for nonradiative recombination by exchange mechanisms are subsequently derived. The dependence of the efficiency of all recombination mechanisms on the quantum-dot size is studied. The experimentally observed growth in the intracenter photoluminescence intensity with decreasing size of dots and nanocrystals is accounted for. Methods for experimental determination of the contributions of different mechanisms to nonradiative recombination are discussed.
Authors:
 [1]
  1. Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)
Publication Date:
OSTI Identifier:
22469681
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 49; Journal Issue: 12; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CADMIUM COMPOUNDS; CRYSTAL GROWTH; DIPOLES; EFFICIENCY; EXCITONS; HALIDES; MAGNESIUM COMPOUNDS; MAGNETIC SEMICONDUCTORS; PHOTOLUMINESCENCE; QUANTUM DOTS; RECOMBINATION; SELECTION RULES; ZINC COMPOUNDS