Artículos de revistas
On the origin of the blueshift from type-II quantum dots emission using microphotoluminescence
Registro en:
Applied Physics Letters. Amer Inst Physics, v. 81, n. 15, n. 2743, n. 2745, 2002.
0003-6951
WOS:000178318400023
10.1063/1.1511812
Autor
Nakaema, MKK
Iikawa, F
Brasil, MJSP
Ribeiro, E
Medeiros-Ribeiro, G
Carvalho, W
Maialle, MZ
Degani, MH
Institución
Resumen
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. 81 15 2743 2745