Overview
The primary focus of our research is the synthesis of semiconductor nanocrystals and metal-semiconductor hybrid structures. We are also interested in studying the optical and electronic properties of these materials.
Information
Prof. Ranjani Viswanatha
Professor
International Centre for Material Science, New Chemistry Unit,
Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore, India. 560064
email: rv@jncasr.ac.in
Phone: 080 2208 2573
Latest News
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Congratulations to Mr. Suhas KT for successfully defending his PhD thesis!
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Congratulations to Dr. Avijit Saha for joining as an assistant professor in the Department of Physics, IIT Bhilai!
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Congratulations to Mr. Subham Das for winning the Best Poster Award at the "International Winter School 2024: Frontiers in Materials Science" held at JNCASR.
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Welcome to Mr. Lovin Babu, our new PhD student!
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Congratulations to Mr. Prasenjit Mandal for successfully defending his thesis!
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Congratulations to Mr. Saptarshi Chakraborty for successfully defending his thesis!
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Congratulations to Ms. Payel Mondal for successfully defending her thesis!\
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Congratulations to Prof. Ranjani Viswanatha at JNCASR for receiving the SERB-POWER fellowship. This fellowship, awarded by the Science and Engineering Research Board (SERB), recognizes the outstanding performance of women scientists in their respective areas of specialization.
Latest Publications
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Soumya Panja, Prasenjit Mandal, Subhashri Mannar, Arpan Das, Shobhana Narasimhan, Ranjani Viswanatha; Ni doping in CsPbCl3 nanocrystals: the key to enhanced photoluminescence. https://doi.org/10.1039/d5sc00564g
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Prasenjit Mandal, Soumya Panja, Ranjani Viswanatha; Delayed Fluorescence in Dual‐Doped Perovskite Nanocrystals: Insight into the Role of Dopants. https://doi.org/10.1002/asia.202401161
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Suhas KT, Tisita Das, Aditya Singh, Azat Khadiev, Ajay Soni, Sudip Chakraborty, Ranjani Viswanatha; Chemical strain induced Rashba effect in two-dimensional Ruddlesden-Popper perovskites. https://doi.org/10.1103/PhysRevB.111.L081401
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Shyamashis Das, Biswajit Bhattacharyya, Ashutosh Mohanty, Poulomi Mukherjee, Arpita Mukherjee, Anirban Dutta, Anshu Pandey, Priya Mahadevan, Ranjani Viswanatha, DD Sarma; Boosting quantum efficiency and suppressing self-absorption in CdS quantum dots through interface engineering. https://doi.org/10.1039/D4NR02990A
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Subham Das, Sudipa Aich, Ranjani Viswanatha; Harnessing Vibrationally Assisted Delayed Fluorescence for Enhanced Energy Transfer in Mn-doped CsPbBr3 Nanocrystals. https://doi.org/10.1021/acsenergylett.4c02592
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KR Pradeep, Priyanka Jain, KT Suhas, Vadim Murzin, Chandrabhas Narayana, Ranjani Viswanatha; Structure of Mixed Halide Perovskite Nanocrystals at Various Length Scales. https://doi.org/10.1021/acs.jpcc.4c05095
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Saptarshi Chakraborty, Subham Das, Gauttam Dash, Ranjani Viswanatha; Evolution of Colloidal Plasmonic Heterostructures from Traditional Semiconductor Nanocrystals to Lead Halide Perovskites: A Review. https://doi.org/10.1021/acsanm.3c05141
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Prasenjit Mandal, Ranjani Viswanatha; Direct Observation of sp-d Exchange Interaction in Mndoped All-inorganic Perovskite Quantum Dots (CsPbX: X= Cl, Br). https://doi.org/10.48550/arXiv.2311.13190
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Prasenjit Mandal, Ranjani Viswanatha; Probing of Excitonic Transitions in All Inorganic Perovskite Quantum Dots (CsPbX3: X= Cl, Br, I) by Magnetic Circular Dichroism Spectroscopy. https://doi.org/10.48550/arXiv.2311.12567
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Chakraborty S; Makkar M; Viswanatha R; Understanding Nanocrystals’ Dopant Edge X-ray Absorption Fine Structure (XAFS) Spectra: An Iterative Fitting Model. https://doi.org/10.1021/acs.jpcc.3c04078
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Chakraborty S; Dash G; Mannar S; Maurya KC; Das A; Narasimhan S; Saha B; Viswanatha R; Nonresonant Exciton–Plasmon Interaction in Metal–Chalcogenide (CuxS)/Perovskite (CsPbBr3) Based Colloidal Heterostructure. https://doi.org/10.1021/acs.jpcc.3c03331
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Chakraborty S; Mondal P; Makkar M; Moretti L; Cerullo G; Viswanatha R; Transition Metal Doping in CdS Quantum Dots: Diffusion, Magnetism, and Ultrafast Charge Carrier Dynamics. https://doi.org/10.1021/acs.chemmater.2c03776
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Mondal P; Sathiyamani S; Das S; Viswanatha R; Electronic structure study of dual-doped II–VI semiconductor quantum dots towards single-source white light emission. https://doi.org/10.1039/D3NR03542E
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Chakraborty S; Grandhi GK, Viswanatha R; Study of the Interface and Radial Dopant Position in Semiconductor Heterostructures Using X-ray Absorption Spectroscopy. https://doi.org/10.1021/acs.jpclett.2c02704
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Chakraborty S; Mandal P; Viswanatha R; Photoluminescence Quenching in CsPbCl3 upon Fe Doping: Colloidal Synthesis, Structural and Optical Properties. https://doi.org/10.1002/asia.202200478
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Andrea Camellini; Haiguang Zhao; Sergio Brovelli; Viswanatha R; Alberto Vomiero; Margherita Zavelani-Rossi; https://doi.org/10.1149/MA2022-01201104mtgabs
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Mannar S; Mandal P; Roy A; Viswanatha R; Experimental Determination of the Molar Absorption Coefficient of Cesium Lead Halide Perovskite Quantum Dots https://doi.org/10.1021/acs.jpclett.2c01198
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Pradeep KR; Abinaya Elumalai; Viswanatha R; Effect of Electronic Structure on Delayed Fluorescence in Mn-Doped Perovskite Nanocrystals https://doi.org/10.1021/acs.jpcc.2c01705
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Avijit Saha; Kushagra Gahlot; Viswanatha R; Exciton Dynamics in Mn/Ni Dual-doped Semiconductor Quantum Dots https://doi.org/10.1002/cnma.202100457
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Avijit Saha; Gaurav Kumar; Santanu Pradhan; Gauttam Dash; Viswanatha R; Gerasimos Konstantatos; Visible-Blind ZnMgO Colloidal Quantum Dot Downconverters Expand Silicon CMOS Sensors Spectral Coverage into Ultraviolet and Enable UV-Band Discrimination https://doi.org/10.1002/adma.202109498
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Mondal P; Viswanatha R; Insights into the Oxidation State of Cu Dopants in II-VI Semiconductor Nanocrystals https://doi.org/10.1021/acs.jpclett.1c04076
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Jain P; Mazumder; Pradeep KR; Viswanatha R; Swapan K. Pati; Chandrabhas Narayana; Polaronic Signatures in Doped and Undoped Cesium Lead Halide Perovskite Nanocrystals through a Photoinduced Raman Mode https://doi.org/10.1021/acsami.1c20321
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Viswanatha R;Prashant V. Kamat; Anthony K. Cheetham; Tribute to D. D. Sarma https://doi.org/10.1021/acs.jpcc.1c06736
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Pradeep KR; Viswanatha R; Doped or not doped? Importance of the local structure of Mn (II) in Mn-doped perovskite nanocrystals https://doi.org/10.1016/j.materresbull.2021.111374
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Mondal P; Sathiyamani S; Viswanatha R; Is the Lack of Orange Emission Infallible Proof of Unsuccessful Doping of Mn in Quantum Dots? https://doi.org/10.1021/acs.jpcc.1c00359
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Chakraborty S; Mannar S; Viswanatha R; Local Surface Plasmon-Assisted Metal Oxide Perovskite Heterostructure for Small Light Emitters. https://pubs.acs.org/doi/10.1021/acs.jpcc.1c03577
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Pradeep KR; Viswanatha R; Doped or not doped? Importance of the local structure of Mn (II) in Mn-doped perovskite nanocrystals. https://doi.org/10.1016/j.materresbull.2021.111374
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Makkar M; Lakshay Dheer; Anjali Singh; Luca Moretti; Margherita Maiuri; Soumen Ghosh; Giulio Cerullo; Umesh V. Waghmare; Viswanatha R; Magneto-Optical Stark Effect in Fe-Doped CdS Nanocrystals. https://pubs.acs.org/doi/10.1021/acs.nanolett.1c00126
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Makkar M; Luca Moretti; Margherita Maiuri; Giulio Cerullo; Viswanatha R; Ultrafast electron-hole relaxation dynamics in CdS nanocrystals. https://doi.org/10.1088/2515-7639/abf546
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Grandhi, G.K.; Krishna, M; Mondal, P; Viswanatha, R; Cation co-doping into ZnS quantum dots: towards visible light sensing applications. Bull. Mater. Sci 43, 301 (2020)
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Makkar, M; Goutam, P; Viswanatha, R; Crystal Facet Engineering of CoPt Quantum Dots for Diverse Colloidal Heterostructures, J. Phys. Chem. Lett., 11 (16), 6742-6748 (2020)
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Mondal, P; Chakraborty, S; Grandhi, G.K.; Viswanatha, R; Copper Doping in II-VI Semiconductor Nanocrystals: Single-Particle Fluorescence Study, J. Phys. Chem. Lett., 11, 13, 5367–5372 (2020)
