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Optical Properties of CdS/HgS/CdS Quantum Dot–Quantum Well Structures
Author(s) -
Porţeanu H.E.,
Lifshitz E.,
Pflughoefft M.,
Eychmüller A.,
Weller H.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200107)226:1<219::aid-pssb219>3.0.co;2-m
Subject(s) - photoluminescence , quantum dot , stokes shift , exciton , raman spectroscopy , phonon , materials science , molecular physics , photoluminescence excitation , spectroscopy , luminescence , absorption edge , excitation , absorption (acoustics) , optoelectronics , condensed matter physics , chemistry , band gap , physics , optics , quantum mechanics , composite material
The optical properties of different quantum dot–quantum well (QDQW) structures and of CdS‐core dots have been studied utilizing photoluminescence (PL), fluorescence line narrowing (FLN), photoluminescence excitation (PLE), and double‐beam PL spectroscopy. The FLN spectra of the CdS core showed resonant Raman lines, distinct from the exciton–phonon replica. The red shift of PL from the absorption edge (here “Stokes shift”) and the phonon energy in the QDQW samples differ from those in the CdS core and from HgS bulk. The Stokes shift has an inversed energy dependence in one QDQW sample compared with all others. An additional, special double beam PL experiment showed an enhancement of the excitonic band as consequence of the partial quenching of the defect band, suggesting a mutual interaction between the two luminescence events.