NISER

Postdoctoral Fellow: (2011-2012) with Prof. Tahei Tahara, Riken, Japan

Postdoctoral Fellow: (2009-2011) with Prof. Paul F Barbara, University of Texas at Austin, USA

PhD Fellow: (2005-2009) with Prof. Kankan Bhattacharyya, Indian Association for the Cultivation of Science, India

M.Sc: (2002-2004), Vidyasagar University, India

Molecular and Single Molecule Spectroscopy 

Ramanujan Fellowship Award: DST-SERB (2012)

NET(JRF) & SET: CSIR & WBCSC (2003)

Gold Medal: Vidyasagar University (2002)

Selected Publications From NISER,

59. Ayendrila Das, Debopam Acharjee, Mrinal Kanti Panda, Asit Baran Mahato, Subhadip Ghosh* Dodecahedron CsPbBr3 Perovskite Nanocrystals Enable Facile Harvesting of Hot Electrons and Holes. J. Phys. Chem. Lett. 2023 (Accepted).

58. Debopam Acharjee, Ayendrila  Das, Mrinal Kanti Panda, Manas Barai, Subhadip Ghosh* Facet Engineering for Decelerated Carrier Cooling in Polyhedral Perovskite Nanocrystals. Nano Lett. 2023, 23, 1946–1953. 

57. Anupam Manna, Tarun Kumar Dinda, Subhadip Ghosh, Prasenjit Mal CsPbBr3 in the Activation of the C–Br Bond of CBrX3 (X = Cl, Br) under Sunlight. Chem. Mater. 2023, 35, 628–637.

56.  Krishna Mishra, Manas Barai, Subhadip Ghosh* Roles of Impurity and Sample Heterogeneity in Intriguing Photoluminescence Properties of Zero-Dimensional (0D) Carbonaceous Materials. J. Phys. Chem. C 2022, 126, 16905–16918 (Accepted) (Invited Article in Early-Career and Emerging Researchers in Physical Chemistry Volume 2 Virtual Special Issue)

55. Sanat Mahankudo, Ayendrila Das, Krishna Mishra, Manas Barai, Prasenjit Mal, Subhadip Ghosh* Synthesis of Cs/Methylammonium/Formamidinium-PbBr3 Perovskite Nanocrystals with Green Emissions: Implications for Display Applications. ACS Applied Nanomaterials. 2022, 5, 4360-4366.

54. Krishna Mishra, Debopam Acharjee, Ayendrila Das, Subhadip Ghosh* Sub-picosecond Hot Hole Transfer in a Graphene Quantum Dot Composite with High Efficiency. J. Phys. Chem. Lett. 2022, 13, 606-613.

53. Krishna Mishra, Debopam Acharjee, Ayendrila Das, Subhadip Ghosh* Femtosecond Upconversion Study of Interfacial Electron Transfer from Photoexcited CsPbBr3 Perovskite Nanocrystal to Rhodamine 6G. J. Phys. Chem. B 2021, 125, 11017-11025 (Invited Article in Prof Kankan Bhattacharyya festschrift).

52. Ayendrila Das, Krishna Mishra, Subhadip Ghosh* Revealing of Explicit Microsecond Carrier Diffusion from One Emission Center to Other in an all Inorganic Perovskite Nanocrystal. J. Phys. Chem. Lett. 2021, 12, 5413-5422.

51. Krishna Mishra, Ayendrila Das, Subhadip Ghosh* Utrafast Interfacial Electron Transfer from Graphene Quantum Dot to 2,4-Dinitrotoluene. J. Phys. Chem. C 2021,125, 9638-9645.

50. Krishna Mishra, Ayendrila Das, Subhadip Ghosh* Subpicosecond Charge Separation Time Scale at Graphene Quantum Dot Surface. J. Phys. Chem. C 2020, 124, 24115-24125.

49. Kiran Bharadwaj, Himanshu Choudhary, Soumitra Hazra, Subhadip Ghosh* Study of Interfacial Charge Transfer from an Electron Rich Organic Molecule to CdTe Quantum Dot by using Stern-Volmer and Stochastic Kinetic Models. ChemPhysChem 2020, 21, 415-422.

48. Kiran Bharadwaj, Himanshu Choudhary, Soumitra Hazra, Subhadip Ghosh* Role of Emissive and Non-Emissive Complex formations in Photoinduced Electron Transfer Reaction of CdTe Quantum Dots. ChemAsianJ  2019, 14, 4207-4216..

47. Krishna Mishra, Somnath Koley, Subhadip Ghosh* Ground State Heterogeneity along with Fluorescent Byproducts Cause the Excitation-Dependent Fluorescence and Time-Dependent Spectral Migration in Citric Acid Derived Carbon Dots. J. Phys. Chem. Lett. 2019, 10, 335-345.

46. Kiran Bharadwaj, Somnath Koley, Subhra Jana, Subhadip Ghosh* Model Free Estimation of Energy Transfer Timescale in a Closely Emitting Cdse/ZnS Quantum Dot and Rhodamine 6g FRET Couple ChemAsianJ  2018, 13, 3296-3303.

45. Manas Ranjan Panda, Somnath Koley, Krishna Mishra, and Subhadip Ghosh* Probing of Reorganization Dynamics within the Different Phases of Thermotropic Liquid Crystals Chemistry Select 2018, 3, 1551-1560.

44. Siddharth Singh, Somnath Koley, Krishna Mishra and Subhadip Ghosh* An Approach to a Model Free Analysis of Excited State Proton Transfer Kinetics in a Reverse Micelle J. Phys. Chem. C 2018, 122, 732-740..

43. Somnath Koley, Manas Panda, Kiran Bharadwaj, and Subhadip Ghosh* Spectroscopic and Calorimetric Studies of Molecular Recognitions in a Dendrimer-Surfactant Complex. Langmuir 2018, 34, 817-825. (Invited article in Early Career Authors in Fundamental Colloid and Interface Science special issue)

42. Somnath Koley and Subhadip Ghosh* Encapsulation and Residency of a Hydrophobic Dye within the Water Filled Interior of a PAMAM Dendrimer Molecule. J. Phys. Chem. B 2017, 121, 1930–1940

41. Somnath Koley and Subhadip Ghosh* A deeper insight to an intriguing acetonitrile-water binary mixture: synergistic effect, dynamic stokes shift, fluorescence correlation spectroscopy and NMR studies. Phys Chem Chem Phys 2016, 18, 32308-32318

40. Somnath Koley and Subhadip Ghosh*;  Study of electron transfer reactions in a dendrimaric assembly: a proper utilization of dendrimer fluorescence. Phys Chem Chem Phys (Communication) 2016, 18, 24830-24834.

39. Somnath Koley, Manas Ranjan Panda, and Subhadip Ghosh*; Study of Diffusion Assisted Bimolecular Electron Transfer Reactions: CdSe/ZnS Core Shell Quantum Dot Acts as an Efficient Electron Donor as well as Acceptor. J. Phys. Chem. C 2016, 120, 13456-13465.

 38. Aparna Bhowmik, Harveen Kaur, Somnath Koley, Subhra Jana, and Subhadip Ghosh*; Diffusion Assisted Bimolecular Electron Injection to CdS Quantum Dots: Existence of Different Regimes in Time Dependent Sink Term of Collins–Kimball Model. J. Phys. Chem. C 2016, 120, 5308–5314.

 37. Somnath Koley, Subhadip Ghosh*; Study of Microheterogeneity in Acetonitrile–Water Binary Mixtures by using Polarity-Resolved Solvation Dynamics. Chem. Phys. Chem. 2015, 16, 3518-3526

36. Somnath Koley, Harveen Kaur and Subhadip Ghosh*; Probe Dependent Anomalies in Solvation Dynamics of Coumarin Dyes in Dimethyl Sulfoxide-Glycerol Binary Solvent:          Confirming the Local Environments are Different for Coumarin Dyes. Phys. Chem. Chem. Phys. 2014, 16, 22352-63 

35. Sankalpita Chakrabarty, Harveen Kaur, Tanusri Pal, Soumitra Kar, Surajit Ghosh, and Subhadip Ghosh*; Morphology Dependent Photo Induced Electron Transfer from N, N Dimethylaniline to Semiconductor  Cadmium Sulfide. RSC Adv. 2014, 4, 35531-35540.

34. Harveen Kaur, Somnath Koley and Subhadip Ghosh*; Probe Dependent Solvation Dynamics Study in a Microscopically Immiscible Dimethyl Sulfoxide-Glycerol Binary Solvent. J. Phys. Chem. B 2014, 118, 7577-7585.

 33. Surajit Ghosh, K. V. S. Girish and Subhadip Ghosh*; Evaluation of Intramolecular Charge Transfer State of 4-N, N Dimethylamino Cinnamaldehyde using Time-Dependent Density Functional Theory. J. Chem. Sci.  2013, 125, 933-938. 

 Other papers from PhD and Post Doc

32.        "Probing Dynamic Heterogeneity in Nanoconfined Systems: The Femtosecond Excitation Wavelength Dependence and Fluorescence Correlation Spectroscopy" by Shantanu Dey, Ujjwal Mandal, Aniruddha Adhikari, Subhadip Ghosh and Kankan Bhattacharyya. Hydrogen Bonding and Transfer in the Excited State Edited by Ke-Li Han and Guang-Jiu Zhao 2011 John Wiley & Sons, Ltd.

31.        "Controlling Chain Conformation in Conjugated Polymers using Defect Inclusion Strategies" by Giannis Buonos, Subhadip Ghosh, Albert K. Lee, Kateri Dubay, Kyle Plunkett, Joshua C. Bolinger, David Reichman, Colin Nuckolls and Paul F. Barbara J. Am. Chem. Soc. 2011, 133, 10155.

30. "A Fluorescence Correlation Spectroscopy Study of the Diffusion of an Organic Dye in the Gel Phase and Fluid Phase of a Single Lipid Vesicle" by Subhadip Ghosh, Aniruddha Adhikari, Supratik Sen Mojumdar, and Kankan Bhattacharyya J. Phys. Chem. B 2010, 114, 5736–5741.

29.        "Study of Diffusion of Organic Dyes in a Triblock Co-Polymer Micelle and Gel by Fluorescence Correlation Spectroscopy (FCS)" by Subhadip Ghosh, Ujjwal Mandal, Aniruddha Adhikari and Kankan Bhattacharyya Chem Asian J. 2009, 4, 948.

28.        "Ultrafast Proton Transfer of Pyranine in a Supramolecular Assembly: PEO-PPO-PEO Triblock Co-polymer and CTAC" by Subhadip Ghosh, Shantanu Dey, Ujjwal Mandal, Aniruddha Adhikari, Sudip Kr. Mondal and Kankan Bhattacharyya J. Phys. Chem. B 2007, 111, 13504.

27.        "Ultrafast Fluorescence Resonance Energy Transfer in the Micelle and the Gel Phase of a PEO-PPO-PEO Triblock Copolymer: Excitation Wavelength Dependence" by Subhadip Ghosh, Shantanu Dey, Aniruddha Adhikari, Ujjwal Mandal and Kankan Bhattacharyya J. Phys. Chem. B 2007, 111, 7085.

26.        "Excitation Wavelength Dependence of Solvation Dynamics in a gel. (PEO)20-(PPO)70-(PEO)20 tri-block copolymer" by Subhadip Ghosh, Aniruddha Adhikari, Ujjwal Mandal, Shantanu Dey and Kankan Bhattacharyya J. Phys. Chem. C 2007, 111, 8775.

25.        "A Femtosecond Study of Photo-Induced Electron Transfer from Dimethylaniline to Coumarin Dyes in a CTAB Micelle" by Subhadip Ghosh, Kalyanasis. Sahu, Sudip Kr. Mondal, Pratik Sen and Kankan Bhattacharyya J. Chem. Phys. 2006, 125, 054509.

24.        "Ultrafast Photoinduced Electron Transfer from Dimethylaniline to Coumarin Dyes in Sodium dodecyl sulfate and Triton X-100 micelle" by Subhadip Ghosh, Sudip Kr Mondal, KalyanasisSahu, and Kankan Bhattacharyya J. Chem. Phys. 2007, 126, 204708.

23.        "Ultrafast Electron Transfer in a Nanocavity. From Dimethyl aniline to Coumarin Dyes in Hydroxypropyl gamma-Cyclodextrin" by Subhadip Ghosh, Sudip Kr Mondal, Kalyanasis Sahu and Kankan Bhattacharyya J. Phys. Chem. A 2006, 110, 13139.

22.    "Study of Organized and Biological Systems Using an Ultrafast Laser" by Subhadip Ghosh, Ujjwal Mandal, Aniruddha Adhikari, Shantanu Dey and Kankan Bhattacharyya Int. Rev. Phys. Chem. 2007, 26, 421.

21.    "Study of Biological Systems and Nano-Confined Environments Using a Femtosecond Laser" by Subhadip Ghosh and Kankan Bhattacharyya Kiron 2007, 18, 21

20.    "A Femtosecond Study of the Interaction of Human Serum Albumin With a Surfactant (SDS)" by Ujjwal Mandal, Subhadip Ghosh, Gopa Mitra, Aniruddha Adhikari, Shantanu Dey and Kankan Bhattacharyya Chemistry- An Asian Journal 2008, 3, 1430.

19.    "Solvation Dynamics in Ionic Liquid Swollen P123 Triblock Copolymer Micelle: A Femtosecond Excitation Wavelength Dependence Study" by Aniruddha Adhikari, Shantanu Dey, Dibyendu Kr. Das, Ujjwal Mandal, Subhadip Ghosh, and Kankan. Bhattacharyya J. Phys. Chem. B 2008, 112, 6350.

18.    "Ultrafast Fluorescence Resonance Energy Transfer in a Bile Salt Aggregate: Excitation Wavelength Dependence" by Ujjwal Mandal, Subhadip Ghosh, Dibyendu Kr. Das, Aniruddha Adhikari, Shantanu Dey and Kankan. Bhattacharyya J. Chem. Sci. 2008, 120, 15.

17.    "Femtosecond Solvation Dynamics in Different Regions of a Bile Salt Aggregate: Excitation Wavelength Dependence" by Aniruddha Adhikari, Shantanu Dey, Ujjwal Mandal, Dibyendu Kr. Das, Subhadip Ghosh and Kankan. Bhattacharyya J. Phys. Chem. B 2008, 112, 3575.

16.    "A femtosecond Study of Excitation Wavelength Dependence of a Triblock Copolymer-Surfactant Supramolecular Assembly: (PEO)20-(PPO)70-(PEO)20 and CTAC" by Shantanu Dey, Aniruddha Adhikari, Ujjwal Mandal, Subhadip Ghosh and Kankan Bhattacharyya J. Phys. Chem. B 2008, 112, 5020.

15.    "Ultrafast Photoinduced Electron Transfer in the Micelle and the Gel Phase of a PEO-PPO-PEO Triblock Copolymer" by Ujjwal Mandal, Subhadip Ghosh, Shantanu Dey, Aniruddha Adhikari and Kankan Bhattacharyya J. Chem. Phys. 2008, 128, 164505.

14.    "Excited-State Proton Transfer from Pyranine to Acetate in Methanol" by Sudip Kr. Mondal, Subhadip Ghosh, Kalyanasis Sahu, Pratik Sen and Kankan Bhattacharyya J. Chem. Sci. 2007, 119, 71.

13.    "A Femtosecond Study of Excitation Wavelength Dependence of Solvation Dynamics in a PEO-PPO-PEO Tri-block Copolymer Micelle" by Pratik Sen, Subhadip Ghosh, Kalyanasis Sahu, Sudip Kr. Mondal, Durba Roy and Kankan Bhattacharyya J. Chem. Phys. 2006, 124, 204905.

12.    "Ultrafast Dynamics in Biological Systems and Nano-Confined Environments" by Kalyanasis Sahu, Sudip Kr. Mondal, Subhadip Ghosh and Kankan Bhattacharyya Bull. Chem. Soc. Jpn. 2007, 80, 1033.

11.    "Femtosecond Solvation Dynamics in a Neat Ionic Liquid and Ionic Liquid Microemulsion: Excitation Wavelength Dependence" by Aniruddha Adhikari, Kalyanasis Sahu, Shantanu Dey, Subhadip Ghosh, Ujjwal Mandal and Kankan Bhattacharyya J. Phys. Chem. B 2007, 111, 12809.

10.    "Excitation Wavelength Dependence of Solvation Dynamics in a Supramolecular Assembly: PEO-PPO-PEO Triblock Copolymer and SDS" by Ujjwal Mandal, Aniruddha Adhikari, Shantanu Dey, Subhadip Ghosh, Sudip Kr. Mondal and Kankan Bhattacharyya J. Phys. Chem. B 2007, 111, 5896.

09.    "Ultrafast Fluorescence Resonance Energy Transfer (FRET) in a Micelle" by Kalyanasis Sahu, Subhadip Ghosh, Sudip Kr. Mondal, Bankim Chandra Ghosh, Pratik Sen, Durba Roy and Kankan Bhattacharyya J. Chem. Phys.2006,125, 044714.

08.    "Ultrafast Fluorescence Resonance Energy Transfer in a Reverse Micelle: Excitation Wavelength Dependence" by Sudip Kr. Mondal, Subhadip Ghosh, Kalyanasis Sahu, Ujjwal Mandal and Kankan Bhattacharyya J. Chem. Phys.2006, 125, 224710.

07.    "Excited State Proton Transfer from Pyranine to Acetate in Gamma-Cyclodextrin and Hydroxypropyl Gamma-Cyclodextrin" by Sudip Kr. Mondal, Kalyanasis Sahu, Subhadip Ghosh, Pratik Sen and Kankan Bhattacharyya J. Phys. Chem. A 2006, 110, 13646.

06.    "Temperature Dependence of Solvation Dynamics and Anisotropy Decay in a Protein. ANS in Bovine Serum Albumin" by Kalyanasis Sahu, Sudip Kr. Mondal, Subhadip Ghosh, Durba Roy, Pratik Sen and Kankan Bhattacharyya J. Chem. Phys. 2006, 124, 124909.

05.    "Femtosecond Study of Partially Folded States of Cytochrome C by Solvation Dynamics" by Kalyanasis Sahu, Sudip Kr. Mondal, Subhadip Ghosh, Durba Roy, Pratik Sen, Kankan Bhattacharyya J.Phys. Chem. B 2006, 110, 1056.

04.    "A Femtosecond Study of Excitation Wavelength Dependence of Solvation Dynamics in a Vesicle" by Pratik Sen, Subhadip Ghosh, Sudip Kr. Mondal, Kalyanasis Sahu, Durba Roy, Kankan Bhattacharyya and Keisuke Tominaga Chemistry- An Asian Journal 2006, 1, 188.

03.    "Fluorescence Anisotropy Decay and Solvation Dynamics of Coumarin 153 in Methyl-Beta Cyclodextrin" by Pratik Sen, Durba Roy, Sudip Kr. Mondal, KalyanasisSahu, Subhadip Ghosh, Kankan Bhattacharyya J. Phys. Chem. A2005, 109, 9716.

02.    "Excited State Proton Transfer of Pyranine in a g-Cyclodextrin Cavity" by Sudip Kr. Mondal, KalyanasisSahu, Pratik Sen, Durba Roy, Subhadip Ghosh, Kankan Bhattacharyya Chem. Phys. Lett. 2005, 412, 228.

01.    "Temperature Dependence of Fluorescence Anisotropy Decay and Solvation Dynamics of Coumarin 153 in g-Cyclodextrin Aggregates" by Durba Roy, Sudip Kr. Mondal, KalyanasisSahu, Subhadip Ghosh, Pratik Sen, Kankan Bhattacharyya J. Phys. Chem. A 2005, 109, 7359.

Single Molecule Spectroscopy and Fluorescence correlation Spectroscopy

Recent advances in single molecule spectrscopy has revolutionised chemistry and biology. The conventional studies in bulk solution give an average over large number of molecules. Single molecule studies reveal that individual molecules differ in reactivity, mobility and other properties which can not be studuied by bulk measurement techniques. Our research is motivated to contribute the latest developments in this field.

    Our work on polarization of single-molecule absorption of random copolymers (MEH-PPV) shows how defect inclusion could affects their morphology. This study also demonstrates that defects that preserve the linear backbone of PPV-type polymers assume a highly anisotropic configuration in defect free MEH-PPV. We are interested on conjugated copolymers because they have numerous applications in molecular photonics, photovoltaic cell, molececular wire and light harvesting apparatuses. 

    Fluorescence correlation spectroscopy (FCS) is an efficient single molecule technique, using FCS we studied mobility (diffusion) of organic dyes in the lipid vesicle. We show that lipid vesicles of same size and same chemical composition do not have same diffusion coefficients and there is a wide variation (distribution) among the diffusion coefficients is observed. This is attributed to the vesicle shape fluctuations. This indicates structures of biological assemblies are fluctuating. We also studied phase dependence (gel and fluid phase) and region dependence in a lipid vesicle.

Ultrafast Spectroscopy

Using picosecond  TCSPC and femtosecond up conversion technique, we study several photo physical processes like solvation dynamics, fluorescence resonance energy transfer (FRET), proton transfer, photo-induced electron transfer (PET) and fluorescence anisotropy decay. Most of the chemical processes take place in a very fast time scale and the entire process cannot be detected by using only picosecind set up. We frequently use femtosecond up-conversion set up which enable us to resolve very fast dynamics (<1 ps). Ultrafast dynamics is ubiquitous in all kind of supramolecular assemblies. Interestingly, even in biological system (i.e., proteins, DNA, RNA) where the water molecules are strongly bound at the vicinity of biomolecule, exhibit a significant amount of ultrafast dynamics which remains undetected even in the femtosecond set up.

     We have studied ultrafast solvation dynamics in different regions of a lipid vesicle through variation of excitation wavelength. Our study has shown that the dynamics varies from region to region and is substantially slower than that in bulk water. Apart from solvation dynamics we have investigated ultrafast fluorescence resonance energy transfer (FRET) in different organized assemblies. In an organized assembly, confinement of a donor and an acceptor at a close distance is expected to accelerate the rate of FRET. The expectation can verify by using ultrafast techniques.

Photo induced electron transfer (PET) plays a fundamental role in many chemical and biological processes. The classic Marcus theory assumes equilibration of solvent at each point along the reaction co-ordinate (i.e., solvation).This theory predicts a bell shaped dependence of rate of electron transfer (ET) on the free energy change. We have detected similar kind of bell shaped dependence of ET rate with "delta G" in three micelles even though major part of solvation is slower than ET.

C402 - Chemical Rate Processes

C242 – Electronics Laboratory

C206- Quantum Chemistry I 

C302 -Molecular Spectroscopy and Group Theory

C101-Chemistry I

C141-Chemistry Lab I