Senior Research Associate - University of Calgary, Alberta Canada, 2012 - 2014
Lecturer -University of Peradeniya, Sri Lanka, 2006 - 2008
Postdoctoral Researcher - Arizona State University, 2005 - 2006
Postdoctoral Researcher - Carnegie Mellon University, 2004 - 2005
PhD, Wayne State University, 2004
BS, University of Peradeniya, Sri Lanka
Photochemistry, Ultra-fast Laser Spectroscopy, Solar Energy and Sustainability, Inorganic Heterostructures
The research interests of Dr. Ranasinghe's group is centered on physical chemistry and spectroscopy. Yet our research is predominantly multidisciplinary. Research in the group is mainly focused on the developments of novel nano-photonic materials for solar energy related applications such as solar energy conversion, photocatalysis and photovoltaics.
The group utilizes ultra-fast, femto-second pulsed laser system to carry out time-resolved fluorescence spectroscopy of these novel materials. These studies provide an in-depth understanding about the photophysical processes taking place in these nanomaterials and their relations to the structure and chemical composition of these nanomaterials. The investigations are further supported by theoretical computational calculations. The group maintains a strong research collaborations with several other research groups in NMT and other US institutions.
In the research group, nano-crystals, semiconductor nanoparticles, quantum dots are being synthesized and studied using various spectroscopic instrumentation. These material are used in photovoltaic, photocatalysis and biological imaging. This research project has an active collaboration with Prof. Fuierer of Materials and Metallurgical Engineering at NMT. Also, Dr. Erik Bandala of Desert Research Institute in Las Vegas NV.
Rajapaksha Ruwini D.; Fuierer Paul A.; Ranasinghe, Mahinda I. Colloidal CuZnInS3 nanocrystals as the sensitizer in photovoltaic solar cells. Solar Energy, 2019, 189, 503-509.
Rajapaksha Ruwini D.; Turner Danielle; Vigil Jade; Frolova Liliya V.; Altig Jeffrey A.; Rogelj Snezna; Ranasinghe, Mahinda I. Photo-physical properties of substituted 2,3-distyryl indoles; A spectroscopic, computational and biological insights, Journal of Photochemistry & Photobiology A: Chemistry, 2019, 376, 73-79.
Rajapaksha, Ruwini D.; Benet, Matthias; Champion, Cody; Frolova, Liliya V.; Rogelj, Snezna; Choudhury, Pabitra; Ranasinghe, Mahinda I. Spectroscopic study of photoactive antibacterial agent: 2,3-Distyrylindoles. Journal of Physical Chemistry A, 2018, 122, 937-945.
Edwards, Les; Turner, Danielle; Champion, Cody; Khandelwal, Megha; Zingler, Kailee; Stone, Cassidy; Rajapaksha, Ruwini D.; Yang, Jing; Ranasinghe, Mahinda I.; Kornienko, Alexander; Frolova, Liliya; Rogelj, S. Photoactivated 2,3-Distyrylindole kill multi-drug resistant bacteria. Bioorganic and Medicinal Chemistry Letters, 28, 2018, 1879-1886.
Rajapaksha, Ruwini D.; Ranasinghe, Mahinda I. The shell thickness and surface passivation dependence of fluorescence decay kinetics in CdSe/ZnS core-shell and CdSe core colloidal quantum dots. Journal of Luminescence, 2017, 192C, 860-866.