Development of ZnO Infrared LED and Its Emissivity N.N.A. Saidi, M.H.A. Wahid, P. Poopalan, N.A.M.A. Hambali, M.M. Shahimin, U.K. Sahbudin, S.N. Ariffin and Muhammad M. Ramli MATEC Web Conf., 78 (2016) 01110 Published online: 07 October 2016 DOI: 10.1051/matecconf/20167801110