Research Expertise and Contribution

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DrSDas

Expertise in the area of time-resolved spectroscopy, including pulse radiolysis and laser flash spectroscopy and the use of these techniques for studying fundamental process such as photophysics of molecules and materials, photoinduced electron transfer and radiation induced free radical reactions of biological importance. Current research interests include design and development of organic photofunctional systems such as liquid crystals, gels and luminescent materials and exploring their application in imaging, sensing and photovoltaic devices. Contributed extensively towards the development of visible and near-infrared absorbing sensitizer dyes of importance to both imaging and solar energy harvesting applications. A large variety of novel photoresponsive liquid crystals with potential imaging and optical switching applications have been investigated. As a part of this work novel photoresponsive cholesteric liquid crystals which could be used for recording colour images in erasable direct read after write (EDRAW) devices have been developed. This work has been submitted for patent filing in Japan and India and was highlighted by Chemistry and Industry, Britain. Investigations on squaraine based dyes have led to the development of a variety of new visible and near infra red dyes which have been shown to useful for biological applications such as in photodynamic therapy and imaging of biomolecules. Recent studies showing that unsymmetrical squaraine dyes can be utilized as efficient sensitizers for dye sensitized solar cells has attracted significant attention and the follow up of this strategy by renowned international groups. Contributed significantly towards understanding fundamental aspects of photoinduced electron transfer processes in homogeneous and heterogeneous media including across solid/liquid and liquid/liquid interfaces. A large number of photochromic dyes have been developed in projects sponsored by Corning SAS, France, which are in advanced stages of testing for applications in photochromic sunglasses. A US patent is being filed protecting the novel materials as well as synthetic methodology developed at NIIST.

Research Expertise and Contribution