Abstract
The optical properties of self-assembled GaN nanorods and GaN/AlGaN multiquantum discs are investigated by using cathodoluminescence (CL) measurements at room temperature. The nanostructure has a di erent dimension along the growth direction, leading to di erent con nement energy states. The dependence of the optical properties on the di erent con nement energy states along the growth direction is clearly demonstrated using the dependence of the CL image on the photon energy (ECL).
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