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X-ray excited optical luminescence imaging of InGaN nano-LEDs

AutorMartínez-Criado, Gema; Sans, Juan Ángel; Segura-Ruiz, Jaime; Tucoulou, Rémi; Solé, A. V.; Homs, Alejandro; Yoo, Jinkyoung; Yi, J. G. C.; Alén, Benito
Fecha de publicación2012
EditorWiley-VCH
CitaciónPhysica Status Solidi (C) Current Topics in Solid State Physics 9: 628-630 (2012)
ResumenIn this work, an imaging tool to investigate optical inhomogeneities with site and chemical sensitivities has been integrated in a synchrotron radiation nanoprobe. Coaxial GaN/In 1-xGa xN/GaN/ZnO nanoarchitecture light emitting diode (LED) arrays are used to validate the scanning x-ray excited luminescence technique. Elemental maps and luminescence images of the hexagonal InGaN multiple quantum wells and inner deposited layers are reported with 120 nm spatial resolution. Within the experimental accuracy, the X-ray fluorescence results reveal an homogeneous distribution of the major elements involved in the pattern formation and heteroepitaxial nanotube growth. In comparison to the morphological pattern, the optical emissions from individual nanowires exhibit a striking spatial variation, indicating significant changes in the quantum confinement effects. © 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.
URIhttp://hdl.handle.net/10261/51385
DOI10.1002/pssc.201100430
Identificadoresdoi: 10.1002/pssc.201100430
issn: 1862-6351
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