Dr.Prakriti Ranjan Bangal
Senior Scientist
CSIR-Indian Institute of Chemical Technology                             
(Council of Scientific and Industrial Research)
Ministry of Science & Technology, Government of India
Tarnaka, Hyderabad-500007, Telangana, INDIA

Landline +91-40-27171431/1530
Mobile 09490119821
Fax +91-40-27160921
Email ID prakriti@iict.res.in
Alternate Email ID prakriti.bangal@gmail.com
Alternate URL



Prakriti Ranjan Bangal was born on Nov. 30, 1969 in a small village of West Bengal, Bahadurpur, 130 KM down to the south of capital city Kolkata. After completing his schooling from his village area, he pursued his B.Sc (Physics Hons) from Midnapore College. Then he moved to Jadavpur University, Kolkata and completed M.Sc in Physics with Electronics as specialization. He pursued his doctoral work at Indian Association for the Cultivation of Science (IACS), Kolkata, an oldest scientific institution in Asia, and obtained his doctorate (Ph.D.) working in the legendary Dept. of Spectroscopy, birth place of “Raman Effect” (Nobel prize in Physics 1930) under the guidance of Prof. Sankar Chakravorti in the field of Molecular electronic spectroscopy in 1998. Thereafter, he acquired his post-doctoral experiences with Prof. Henry Linschitz in Brandeis University, USA, Prof. Linda Peteanue in Carnegie Mellon University, USA and Prof. Naoto Tamai in Kwansei Gakuin University, JAPAN. Before joining IICT, Hyderabad in 2005 he worked as RA-II at Saha Institute of Nuclear Physics, Kolkata. His main research interest thrust to different aspects of Photochemistry and Photophysics of functional organic molecules for molecular device applications.


Ph. D, Indian Association for the Cultivation of Science, Jadavpur University, (1998).

Title of Thesis: Photophysics and photochemistry of some bichromophoric organic systems in different environments


1. Research Associate: IACS, Kolkata, May 1998 to Oct 1999

2. Postdoctoral Fellow: Brandeis University, Walthem, Boston, MA USA, Nov 1999 to May 2001

3. Visiting Research Fellow: Carnegie Mellon University, Pittsburgh,USA, May 2001 to Oct 2001.

4. JSPS Fellow: Kwansei Gakuin University, JAPAN, Nov 2001 to Nov 2003.

5. Research Associate-II: Saha Institute of Nuclear Physics (SINP), Kolkata Dec 2003 to Aug 2005.

6. Scientist-B: CSIR-IICT, Hyderabad 31st Aug 2005 to 30th Aug 2008.

7. Scientist-C: CSIR-IICT, Hyderabad 31stAug 2008 to till date

Research Interests

Present Research

My various research interests are related to Photochemistry and Photophysics of functional molecules and their nano structures from bulk to single molecule level and from steady state to femtosecond time domain.

Ultrafast Spectroscopy:

Photochemical or photophysical processes occur in ultrashort timescales, typically in less than a few tens of picoseconds, when the conventional rules of photochemistry may not hold good. Conventional photochemistry deals with steady state fluorescence and phosphosphorescence which occur from lowest singlet and triplet excited electronic states respectively and fluorescence/phosphorescence spectrum has very little dependence on the wavelength of excitation considering nonradiative transitions namely internal conversion from upper excited states, vibrational and solvent relaxation are, in most cases, much faster than radiative transitions and other photochemical processes (Kasha-Vavilov Rule).

This rules perhaps stands void when photochemistry occurs on a timescale similar to internal conversion from upper excited states, vibrational or solvent relaxation, i.e. photochemistry occurs in upper electronic or vibronic excited state or before the lowest excited state has reached to thermal equilibrium. Therefore ultrafast spectroscopic techniques may pave the way forward for photo selective chemical reaction dynamics. In our laboratory at present we use state-of-art Fluorescence Up-conversion and femtosecond transient absorption techniques along with conventional TCSPC and steady state spectroscopy to address fundamental issues of photoinduced processes , such as electron transfer/FRET, Proton Coupled Electron Transfer (PCET)in 'non-Kasha' regime for functional light harvesting molecules in view to photochemical energy conversion.

Fluorescence Correlation Spectroscopy (FCS):

FCS is a single molecule level fluorescence too which we use for measuring diffusion dynamic, therefore hydrodynamic radius (RH ) and chemical reaction rates in extremely low concentrated solution (as for example Host-Guest dynamic) of intrinsic fluorescent molecules, their nano-structures and fluorescent labelled macromolecules in crowded environment mimicking to the interior of living cells. Furthermore, we exploit FCS as a promising tool in nanomaterials research for determining concentration, size, and diffusion coefficient using a mono dispersed solution of dye functionalized particles.

Fluorescence Switch Molecules:

We are trying to develop new class of fluorescence switch molecules using spirospyran and oxazaine as a fluorescence regulator.

Past Research

1. Electro Absorption spectroscopy (Stark Spectroscopy)

2. Scanning Near-Field Optical Microscopy

3. IR-RF Double Resonance Spectroscopy & Microwave Spectroscopy

Projects Involved

1. Scanning Electron Microscope(SEM) Technical Service, CSIR-IICT- Project Leader

2. Proton Coupled Electron Transfer, DST Sponsored Project-Principal Investigator

3. Different XII-five year plan Projects of CSIR-IICT, (IntelCoat, M2D, Multifun)- as member.

Research Group Members

  1. Suthari Prashanthi, work completed 2013, Thesis submission pending
  2. D. Siva, work completed 2015, Thesis submission pending
  3. . K Anuradha, work completed 2015, Thesis submission under progress.
  4. B. Ramakrishana, SRF,
  5. Y. Venkatesh, JRF


  1. 1. Synthesis and spectral characterization of photoswitchable oligo(p-phenylenevinylene)–spiropyran dyad. Siva Doddi, Bheerappagari Ramakrishna, Yeduru Venkatesh, and Prakriti Ranjan Bangal, RSC Adv., 2015, 5, 56855.
  2. 2. Investigation of Supramolecular Stoichiometry and Dynamic for Inclusion Complex of Water Soluble Porphyrin with Cucurbit [7] uril by Fluorescence Correlation Spectroscopy, Suthari Prashanthi, P. Hemant Kumar, Doddi Siva, and Prakriti Ranjan Bangal, J. PhotoChem. Photobiol: A Chem, 2014, 284, 27-35.
  3. 3. Ultrafast Relaxation Dynamics of 5,10,15,20-meso-Tetrakis Pentafluorophenyl Porphyrin Studied by Fluorescence Up-Conversion and Transient Absorption Spectroscopy. P. Hemant Kumar, Yeduru Venkatesh, Doddi Siva, B. Ramakrishna, and Prakriti Ranjan Bangal, J. Phys. Chem. A, 2015, 119, 1267−1278.
  4. 4. Reductive quenching of pyridine linked porphyrins by phenol: a case of proton coupled electron transfer, Suthari Prashanthi and P. R. Bangal, Chem. Commun., 2009, 1757 - 1759, DOI: 10.1039/b818892k
  5. 5. Preparation of graphene by the rapid and mild thermal reduction of graphene oxide induced by microwaves. Wufeng Chen , Lifeng Yan, P. R. Bangal, Carbon 2010,48 ,1146-1152


  1. 1. ‘Light’ to Enlighten ‘Physics’ Popular lecture for school children in Hyderabad. 2014
  2. 2. Two- focus Fluorescence Correlation Spectroscopy (2fFCS): A robust tool for absolute Diffusion Coefficient Measurement in crowded environment. 24-28th Nov., 2013 FCS ,Nnational Fluorescence Workshop IISC & JNCASR Bangalore. Invited Talk ,IT-12
  3. 3. Proton Coupled electron Transfer in Porphyrin based system, National Symposium on Atomic and Molecular Spectroscopy, 2010, 27-28 March, Santiniketan, West Bengal. (Invited Talk)
  4. 4. Change of surface morphology of photochromic pyrazole derivativ on glass substrate influenced by photo excitation. XX1st International conference on photochemistry, Nara, Japan, July 26-31, 2003.
  5. 5. Transient Spectroscopic Study of Photochromic Pyrazole Derivative. Annual meeting of Japan Photophysical Society 2002 , Kyoto.


  1. 1. JSPS Postdoctoral Fellowship Award 2001.
  2. 2. SERC Fast Track Fellowship for Young Scientist 2006
  3. 3. DAAD Research Fellowship Award 2012.

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