N. Thejo Kalyani is Assistant Professor in the Department of Applied Physics, Laxminarayan Institute of Technology, Nagpur, India.Hendrik C. Swart is a senior professor in the Department of Physics at the University of the Free State, South Africa. His research investigates the degradation of phosphors for field emission displays, as well as developing materials for nano solid-state lighting. He has been key in the development of processes to synthesize and deposit thin films of several types of semiconductor nanoparticles to enhance the color, luminescent intensity, and lifetime of such displays.Sanjay J. Dhoble is a Professor in the Department of Physics at R.T.M. Nagpur University, India. During his research career, he has worked on the synthesis and characterization of solid-state lighting materials, as well as the development of radiation dosimetry phosphors using thermoluminescence techniques and utilization of fly ash.