Emission Rate Variation and Efficiency Measurement in TiO2 Light Emitting Diode S.N. Ariffin, N.A.M.A. Hambali, M.H.A. Wahid, M.M. Shahimin, U.K. Sahbudin and N.N.A. Saidi MATEC Web Conf., 78 (2016) 01111 Published online: 07 October 2016 DOI: 10.1051/matecconf/20167801111