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On the origin of the blueshift from type-II quantum dots emission using microphotoluminescence

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8 Author(s)
Nakaema, M.K.K. ; Instituto de Fı´sica Gleb Wataghin, Unicamp, CP-6165, 13083-970 Campinas-SP, Brazil ; Iikawa, F. ; Brasil, M.J.S.P. ; Ribeiro, E.
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We have studied type-II InP/GaAs self-assembled quantum dots by microphotoluminescence spectroscopy. Sharp spectral features were observed on top of a broad emission band. They are associated to statistical fluctuations from the ensemble of dots. Photoluminescence measurements as a function of the excitation intensity revealed markedly distinct behaviors: the broadband contour shows a large blueshift while the energy positions of the sharp features remain basically constant. We show that the large blueshift of the broad emission band in type-II quantum dots is not due to the barrier interface potential variation, but to the state filling of higher-energy states. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:81 ,  Issue: 15 )