Direct observation of infrared electroluminescence of high mobility graphene field-effect transistors Sylvio Rossetti, Aurélien Schmitt, Loubnan Abou-Hamdan, Rémi Bretel, Patrick Bouchon, Emmanuel Baudin and Yannick De Wilde EPJ Web Conf., 287 (2023) 04003 Published online: 18 October 2023 DOI: 10.1051/epjconf/202328704003