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Optical Characterization of Self‐Organized PbSe/Pb 1–x Eu x Te Quantum Dot Superlattices
Author(s) -
Aigle M.,
Pascher H.,
Pinczolits M.,
Springholz G.,
Schwarzl T.,
Heiss W.,
Bauer G.
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(200103)224:1<223::aid-pssb223>3.0.co;2-b
Subject(s) - quantum dot , photoluminescence , superlattice , molecular beam epitaxy , condensed matter physics , materials science , photon energy , luminescence , excitation , band gap , photon , optoelectronics , physics , epitaxy , optics , nanotechnology , layer (electronics) , quantum mechanics
Photoluminescence (PL) experiments have been performed on self‐organized PbSe/Pb 1— x Eu x Te ( x = 0.05 to 0.1) quantum dot superlattices grown by molecular beam epitaxy (MBE). At a temperature of 1.7 K, several PL lines were observed in the spectral range from 200 to 230 meV with a relatively narrow width of typically 1 to 2 meV. These lines emerge on top of a weak, broader band. Comparison of the luminescence photon energy with that of bulk PbSe (146 meV) shows the strong influence of carrier confinement. Studies of the temperature and magnetic field dependence demonstrate that the narrow lines are not significantly shifted up to 50 K and 7 T, respectively, whereas the broader band exhibits a shift comparable to that of bulk PbSe material. Studies of the PL intensity as a function of excitation power and the preferred emission of radiation from the sample edge indicate stimulated emission.