Organic based carbon quantum dot: Unique nano-dimensional material as stable white light generator

White light emission offers numerous benefits as it encompasses the entire visible spectrum, making it suitable for a wide range of applications in Display technologies like LCDs and OLEDs, phototherapy in medicine, photography and cinematography etc. In todays’ industry, among all available white light emitting sources like Gas discharge lamps, Incandescent lamps, CFL and LEDs generates metallic vapor that creates the matter of severe concern as it leaches into the environment during use and after disposal and are responsible for the greenhouse effect due to heat generation. Similarly among all available white LED and Quantum dots LED (QLED), chips are usually made up of inorganic semiconductors like GaAs, GaP, or GaAsP and inorganic semiconductor QDs such as PbS, CdTe, CdSe, etc. Most of the above-mentioned white light sources primarily contain heavy metal ions like mercury, cadmium, lead, Gallium, and tellurium, etc which are sources of potential health and environmental hazards. To overcome the obstacles towards life and environment, carbon quantum dot (CQDs) have emerged as promising fluorescent alternative nanoparticles for white light generation. Due to their distinctive electronic, optical, physical, chemical and surface properties, CQDs have drawn a lot of attention in recent years. CQDs are zero-dimensional carbon-based nanoparticles having size between 2-20 nm which consists of sp2 aromatic core surrounded by sp3 hybridized carbon matrix [1]. The present work deals with green synthesis of CQDs from natural resources and their applications as white light generator. The computational optical efficiencies of simulated CQDs have been validated with experimentally prepared CQDs’ signals by TEM, UV-Vis absorption, fluorescence and FTIR spectroscopy [2]. The emergence of high-intensity luminescence validates CQDs' significant potential as white light generators for today's optoelectronic and biological industries.

Dr. Papia Chowdhury is Professor in the Department of Physics. She has done her M.Sc. from Department of Physics Jadavpur University and PhD Physics (Molecular Spectroscopy) from Indian Association for the Cultivation of Sciences, Kolkata. During her doctoral research period her research interest was on the outcome of photo dynamics of some industrially applicable organic bi-chronophers in different environments including some organized assemblies. After doctoral study she has started research collaboration with various research groups of India and abroad like Indian Association for the Cultivation of Sciences (IACS), Jawaharlal Nehru Centre Advanced Scientific Research (JNCASR), Bangalore, BITS, Department of Physics, Department of Botany Guwahati University, Freie University, Berlin, Germany etc. She has also started collaboration with Industry like Hind High Vacuum Pvt. Ltd Bangalore and Bruker India Scientific Ltd, Kolkata etc. Prof Chowdhury has published more than 95 peer reviewed papers in reputed international journals and several papers in international/national conferences. Her publications have received more than 1190 citations. Her h-index is 19 and i10-index is 38 (source: Google scholar). She has organized and attended several international/national conferences/workshops and presented her research work there. She has completed one DST funded project and one DRDO project. She has one ongoing research project from Industry (KFCL)Prof. Chowdhury has refereed for several journals of international repute, e.g., Journal of Physical Chemistry, Chemical Physics Letters, Langmuir, Sensors & Actuators Reports, B, Molecular Physics, Journal of Molecular modeling, Spectro chimica acta etc. She has guided 6 PhD students.