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Magneto‐Optical Studies of HgTe/Hg x Cd 1− x Te(S) Core–Shell Nanocrystals
Author(s) -
Fradkin Leonid,
Langof Lidia,
Lifshitz Efrat,
Rogach Andrey,
Gaponik Nikolai,
Weller Horst,
Eychmüller Alex
Publication year - 2003
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200300809
Subject(s) - photoluminescence , luminescence , spectroscopy , nanocrystal , chemistry , core (optical fiber) , analytical chemistry (journal) , spectral line , valence (chemistry) , materials science , molecular physics , atomic physics , condensed matter physics , optoelectronics , physics , nanotechnology , organic chemistry , chromatography , quantum mechanics , astronomy , composite material
Abstract The synthesis and magneto‐optical properties of HgTe nanocrystals capped with Hg x Cd 1− x Te(S) alloyed shells have been investigated. The magneto‐optical measurements included the use of optically detected magnetic resonance (ODMR) and circular polarized photoluminescence (CP‐PL) spectroscopy. The PL spectra suggest the existence of luminescence events from both the core HgTe and the Hg x Cd 1− x Te(S) shells. The continuous‐wave (cw) and time‐resolved ODMR measurements revealed that the luminescence at the shell regime is associated with a trap‐to‐band recombination emission. The electron trap is comprised of a Cd–Hg mixed site, confirming the existence of an alloyed Hg x Cd 1− x Te(S) composition. The ODMR data and the CP‐PL measurements together revealed the g ‐values of the trapped electron and the valence band hole.