Dr. J. Thirumalai received his Ph.D. from Alagappa University, Karaikudi in 2010. He was awarded the Post-doctoral Fellowship from Pohang University of Science and Technology (POSTECH), Republic of Korea, in 2013. He worked as an Assistant Professor of Physics, B.S. Abdur Rahman University, Chennai, India (2011 to 2016). Currently, he is working as an Assistant Professor & Head of the Department of Physics, SASTRA Deemed to be University, Kumbakonam (T.N.), India. His research interests focus on luminescence, self-assembled nanomaterials, thin-film optoelectronic devices & Supercapacitors. He has published more than 60 SCOPUS/ISI indexed papers, 11 book chapters, and he edited 5 books. He is serving as a member in various national and international societies. Currently, he is acting as a principal investigator for a funded project towards the application of luminescence-based thin-film optoelectronic devices, funded by the Science and Engineering Research Board (SERB), India. As an expert in optoelectronics and nanotechnology area, he has been invited to examine several MSc and Ph.D. theses, invited to give a talk in various forums and to review papers for international and national journals.