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Dual Contribution to the Stokes Shift in InGaN–GaN Quantum Wells
Author(s) -
Ochalski T.J.,
Gil B.,
Bigenwald P.,
Bugajski M.,
Wojcik A.,
Lefebvre P.,
Taliercio T.,
Grandjean N.,
Massies J.
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(200111)228:1<111::aid-pssb111>3.0.co;2-m
Subject(s) - quantum confined stark effect , quantum well , photoluminescence , stokes shift , blueshift , stark effect , alloy , materials science , spectral line , quantum , condensed matter physics , optoelectronics , chemistry , physics , optics , quantum mechanics , luminescence , metallurgy , laser
By comparing photoluminescence and photoreflectance spectra taken on a series of InGaN–GaN quantum wells grown under identical conditions except the growth time of the InGaN layers, we could monitor the Quantum Confined Stark Effect (QCSE) without changing the nanotexture of the alloy layers. Our results indicate that, for quantum wells which radiate in the red, the contribution of the QCSE superimposes on the intrinsic localization phenomena of the carriers in the InGaN alloy, and is larger by one order of magnitude. Interpretation of data for samples that emit from the blue to the red can provide only partial conclusions if both localization effects and QCSE are not taken into consideration.