C.K. Jayasankar

Abstract: Lanthanide (Ln³⁺)-doped glasses, glass-ceramics and phosphors have been used for a variety of technological applications such as bio-labels, waveguide lasers, solar cells, laser diodes, etc., due to their characteristic features such as intense fluorescence with high emission cross-section and longer lifetimes, ability to tune the emission from infrared to visible regions by exploiting the down-conversion, up-conversion, cross-relaxation and energy transfer process. In spite of remarkable progress has been made, unfortunately, till date, there is no systematic relation between composition of the host matrix/concentration of Ln³⁺ ion and spectroscopic properties. The reason may be due to errors involved both in experimental and theoretical analyses. To resolve these issues, our group has been prepared variety of Ln³⁺ based systems and characterized their spectroscopic properties systematically.The detailed analysis such as intensity parameters, excited state lifetimes, stimulated emission cross-sections, gain band width, figure of merit, chromaticity color coordinates, multipolar interactions, energy transfer parameters, etc., for variety of Ln³⁺: matrices have been estimated besides exploring the development of photonic devices.

Biography:

Biography: Dr. Chalicheemalapalli Kulala Jayasankar (CKJ), UGC-BSR Faculty Fellow, Department of Physics, Sri Venkateswara University, Tirupati – 517 502, Andhra Pradesh, India has made outstanding contributions on the preparation, characterization and optimization of a variety of lanthanide-doped optical quality glasses/nano-glass ceramics and nanocrystalline materials for various applications like the development of lasers, optical fiber amplifiers, sensors, biolabels, W-LEDs and buried waveguides. He also explored pressure and temperature dependent luminescence properties which provide valuable information about the interaction between lanthanides and its surrounding ligands and in turn possibilities to develop/access optical devices. Characterization of the Nd:glasses developed indigenously by him showed far better characteristics than commercially available laser glasses. A recent scientometrics analysis of rare earths research in India published in Current Science (110, 1184-7(2016)) lists Prof. Jayasankar as one of the most prolific Indian authors in field of rare earths research in the order of z-index. The research activities of Prof. Jayasankar are of both fundamental as well as applied in nature. These research activities have been supported/collaborated by a wide variety of Government and industrial organizations both from India and abroad (Germany, UK, Italy, Spain, Mexico, Thailand and Portugal). He visited USA, Europe, Mexico, Canada and Asia under various capacities and assignments. He has published 290 papers in peer-reviewed International Journals with citations as per Web of Science (citations:6632, h-index:46), as per SCOPUS (citations:6986 and h-index:47 (ID:7003364577)), as per Research gate (citations:6100; h-index:44 and R.Score:43.97) and as per Google Scholar (citations:8175; h-index:52 and i10-index:179). He guided 26 Ph.D. and 10 M.Phil. students. His systamatic and uniform studies on rare earths-ligands-radiation advanced the state of knowledge in the rare earth spectroscopy substantially and strengthened for the better understanding and design of optical devices based on rare earths.

Email:

Address:Sri Venkteswara University , Department of Physics, Tirupati , India, 517 502