Lz-gradient量子井戸構造の顕微発光分光

概要

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We studied μPL spectra in a Lz-gradient quantum well structure. In the Lz-gradient QW, the thickness of the QW changes monotonously along the Y-axis of the sample, and the peak shifts of excitonic luminescence are observed depending on Lz. In addition, from the space-resolved μPL spectroscopy, it is found that the resonant PL of the QW excitons appears in the wide area of a few micrometers departed from the exciting spot. We built up new μPL detecting system in order to measure the spatial propagation and diffusion of the exciton. By using a bundle fiber, we can observe simultaneously μPL spectra at the different positions in the wide area of 〜10μm. Although the exciting spot size is about 3μm in diameter, a QW PL band appears in the wide area beyond the exciting spot without pronounced peak shift. This result suggests that excitons in quantum well resonantly propagate over a range of several μm.
熊本大学の論文
2011-03-00