We are interested in spectroscopy and dynamics of short-lived (transient) species formed on photo-excitation of molecular systems and materials.
We employ time-resolved fluorescence and ultrafast pump-probe (transient absorption spectroscopy) techniques for this purpose.
We also use time-resolved confocal fluorescence microscopy technique like fluorescence lifetime imaging and single-molecule fluorescence technique such as fluorescence correlation spectroscopy for our studies.
We are currently engaged in the study of charge carrier dynamics and fluorescence blinking in a variety of photo-excited perovskite nanocrystals of different morphologies,
photo-induced processes in semiconductor quantum dots, solute and solvation dynamics and understanding the nature of the ionic liquids and deep eutectic solvents.
Some Recent Publications
Room-TemperatureTreatment with Thioacetamide Yielding Blue-and Green-Emitting CsPbX3 Perovskite Nanocrystals with Enhanced Photoluminescence Efficiency and Stability, R.K. Gautam, S. Das and A.Samanta, ChemNanoMat, (2022) e202200029.
Can Sulfur-Containing Small Systems Enhance the Photoluminescence and Stability of the Blue-, Green- and Yellow-Emitting Perovskite Nanocrystals? A Case Study with Sodium Thiosulfate, R.K. Gautam, S. Das and A.Samanta, J. Phys. Chem. C, 125 (2021) 24170.
Effect of Lead:Halide Precursor Ratio on the Photoluminescence and Carrier Dynamics of Violet- and Blue-Emitting Lead Halide Perovskite Nanocrystals, S.Paul, T. Ahmed, S.Das and A. Samanta, J. Phys. Chem. C 125 (2021) 23539.
Highly Luminescent and Phase-Stable Red/ NIR-Emitting All-Inorganic and Hybrid Perovskite Nanocrystals, S.Das and A. Samanta, ACS Energy Lett. 6 (2021) 3780.
Solute Rotation and Solvation Dynamics in Deep Eutectic Solvents", S. S. Hossain and A. Samanta, Chemical Physics Impact 3 (2021) 100043.
Lack of Environmental Sensitivity of a Naturally Occurring Fluorescent Analog of Cholesterol, A.Chattopadhyay, S.C. Biswas, R. Rukmini, S. Saha and A. Samanta, Journal of Fluorescence 31 (2021) 1401.
Structural Stability and Conformational Dynamics of Cytochrome c in Hydrated Deep Eutectic Solvents, S. S. Hossain, S. Paul, and A. Samanta, J. Phys. Chem. B 125 (2021) 5757.
Dark Excitons of the Perovskites and Sensitization of Molecular Triplets,N. Mondal, A. De, S.Seth, T. Ahmed, S. Das, S.Paul, R.K. Gautam and A.Samanta, ACS Energy Lett. 6 (2021) 588.
Individual Particle-Level Picture of Charge Carrier Recombination in Bi-Doped CsPbBr3 Nanocrystals, T. Ahmed A. De, S.Paul and A. Samanta, J. Phys. Chem. C 125 (2021) 2156.
On the Stability and Conformational Dynamics of Cytochrome c in Ammonium Ionic Liquids, A. Pabbathi, and A. Samanta, J. Phys. Chem. B 124 (2020) 8132.
Hot Hole Transfer Dynamics from CsPbBr3 Perovskite Nanocrystals, A.De, S.Das, A.Samanta, ACS Energy Lett. 5 (2020) 2246.
Complete Solvation Dynamics of Coumarin 153 in Tetraalkylammonium Bromide-Based Deep Eutectic Solvents, S. S. Hossain, S. Paul, and A. Samanta, J. Phys. Chem. B 124 (2020) 2473.
Ambient Condition Mg2+ Doping Producing Highly LuminescentGreen- and Violet-Emitting Perovskite Nanocrystals with ReducedToxicity and Enhanced Stability, S.Das, A.De and A.Samanta, J. Phys. Chem. Lett. 11 (2020)1178.
Insights into the Folding Pathway of a c-MYC-Promoter-Based i-Motif DNA in Crowded Environments at the Single-Molecule Level S. Paul, S. S. Hossain and A. Samanta, J. Phys. Chem. B 124 (2020) 763.
N-Bromosuccinimide as Bromide Precursor for Direct Synthesis of Stable and Highly Luminescent Green-Emitting Perovskite Nanocrystals, S.Paul and A. Samanta, ACS Energy Lett. 5 (2020) 64.