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Type: Artigo de periódico
Title: On the origin of the blueshift from type-II quantum dots emission using microphotoluminescence
Author: Nakaema, MKK
Iikawa, F
Brasil, MJSP
Ribeiro, E
Medeiros-Ribeiro, G
Carvalho, W
Maialle, MZ
Degani, MH
Abstract: 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. (C) 2002 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Citation: Applied Physics Letters. Amer Inst Physics, v. 81, n. 15, n. 2743, n. 2745, 2002.
Rights: aberto
Identifier DOI: 10.1063/1.1511812
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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