Light-Emitting-Diodes based on ordered InGaN nanocolumns emitting in the blue, green and yellow spectral range. Auteur(s): Bengoechea-Encabo Ana, Albert Steven, Lopez-Romero D., Lefebvre P., Barbagini Francesca, Torres-Pardo A., González-Calbet Jose M., Sanchez-Garcia M.A., Calleja E. (Article) Publié: Nanotechnology, vol. 25 p.435203 (2014) Texte intégral en Openaccess : Ref HAL: hal-01073992_v1 PMID 25297338 DOI: 10.1088/0957-4484/25/43/435203 WoS: 000344159600003 Exporter : BibTex | endNote 18 Citations Résumé: The growth of ordered arrays of InGaN/GaN nanocolumnar light emitting diodes by molecular beam epitaxy, emitting in the blue (441 nm), green (502 nm), and yellow (568 nm) spectral range is reported. The device active region, consisting of a nanocolumnar InGaN section of nominally constant composition and 250 to 500 nm length, is free of extended defects, which is in strong contrast to InGaN (planar) layers of similar composition and thickness. Electroluminescence spectra show a very small blue shift with increasing current (almost negligible in the yellow device) and line widths slightly broader than those of state-of-the-art InGaN quantum wells. |