Faculty at School of Natural Sciences

Debdas Ray

Debdas Ray

Associate Professor

School of Natural Sciences


Contact Information

Advanced photofunctional materials, thermally activated delayed fluorescence, room-temperature phosphorescence, singlet-triplet management, organic light emitting diode, data security, sensing, and bio-imaging

2008, Ph.D., Indian Institute of Technology Kanpur

2002, M.Sc., Calcutta University

2000, B.Sc., Thakur Pukur Vivekananda College, Calcutta University

2009-2011

Postdoctoral Research Fellow, University of Bordeaux, France

2011-2012

Postdoctoral Research Fellow, Dartmouth College, Hanover, New Hamshire, USA

2012-2013

Postdoctoral research Fellow, National Institute for Materials Science (NIMS), Japan

2021-2023, Research grant of ~40 Lakhs (INR) from SERB-DST, Government of India

2015-2018, Research grant of ~26 Lakhs (INR) from SERB-DST, Government of India

2016-2020, Research grant of ~50 Lakhs (INR) (Four year) from SERB-DST, Government of India

2018-2020, Research grant of ~25 Lakhs (INR) from BRNS-DAE, India

2017, Reviewer of International journals published by ACS, Elsevier, RSC etc.

2016, Reviewer of Science and Engineering Research Board (SERB), Government of India

2016, Featured in 'Faculty in Spotlight' of Shiv Nadar University

2012-2013, Postdoctoral fellowship at the National Institute of Materials Science, Japan

2011-2012, Postdoctoral fellowship at the Dartmouth College, New Hampshire, USA

2009-2011, Postdoctoral fellowship at the Bordeaux University, France

2005-2008, Senior Research Fellowship, Council of Scientific and Industrial Research, India

2002-2005, Junior Research Fellowship, Council of Scientific and Industrial Research, India

  • S. Karmakar, S. Dey, M. Upadhyay, D. Ray*, "Phenoxazine–Quinoline Conjugates: Impact of Halogenation on Charge Transfer Triplet Energy Harvesting via Aggregate Induced  Phosphorescence", ACS Omega 2022, 7, 16827–16836.
  • S. Dey, M. Hasan, A. Shukla, N. Acharya, M. Upadhyay, S.-C. Lo, E. B. Namdas, D. Ray*,  "Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence in  Asymmetric Phenoxazine-Quinoline (D2–A) Conjugates and Dual Electroluminescence",  J. Phys. Chem. C. 2022, 126, 5649–5657.
  • N. Acharya, S. Dey, R. Deka, D. Ray*, "Molecular-Level Understanding of Dual-RTP via  Host- Sensitized Multiple Triplet-to-Triplet Energy Transfers and Data Security Application", ACS Omega 2022, 7, 3722-3730.
  • N. Acharya, M. Hasan, S. Dey, S.-C. Lo, E. B. Namdas, D. Ray*, "Phenothiazine-Quinoline  Conjugates Realizing Intrinsic TADF and RTP:Understanding the Mechanism and Electroluminescence Devices", Adv. Photonics Res. 2021, 2000201.
  • H. Bhatia, S. Dey, D. Ray*, "Effect of π···π Interactions of Donor Rings on Persistent Room- Temperature Phosphorescence in D4–A Conjugates and Data Security Application", ACS Omega 2021, 6, 3858-3865.
  • H. Bhatia, D. Ray*, "Asymmetric-Donors(D2D′2)- Acceptor(A) Conjugates for Accessing  Simultaneous Intrinsic Blue-RTP and Blue-TADF", Mat. Adv.2020, 1, 1858-1865.
  • S. Karmakar, D. Ray*, "Synthesis, optical properties, acid-base vapochromism and anti- counterfeiting of novel π-extended pyridine fused coumarins", J. Lumin. 2020, 223, 117229.
  • H. Bhatia, D. Ray*, Use of Dimeric Excited Staes of the Donors in D4-A Systems for  Accessing White Light Emission, Afterglow, and Invisible Security Ink", J. Phys. Chem. C  2019, 123, 22104-22103.
  • I. Bhattacharjee, N. Acharya, D. Ray*, "Thermally activated delayed fluorescence and  room-temperature phosphorescence in naphthyl appended carbazole-quinoline  conjugates, and their mechanical regulation", Chem. Commun., 2019, 55, 1899-1902.
  • I. Bhattacharjee, N. Acharya, S. Karmakar, D. Ray*, "Room-temperature Orange-Red Phosphorescence by Way of Intermolecular Charge Transfer in Single-Component Phenoxazine-Quinoline Conjugates and Chemical Sensing", J. Phys. Chem. C 2018, 122, 21589-21597.
  • H. Bhatia, I. Bhattacharjee, D. Ray*, "Biluminescence via Fluorescence and Persistent Phosphorescence in Amorphous Organic Donor (D4)-Acceptor(A) Conjugates and Application in Data Security Protection", J. Phys. Chem. Lett., 2018, 9, 3808-3813.
  • I. Bhattacharjee, N. Acharya, H. Bhatia, D. Ray*, "Dual Emission through Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence, and Their Thermal Enhancement via Solid-State Structural Change in a Carbazole-Quinoline Conjugate", J. Phys. Chem. Lett., 2018, 9, 2733-2738.
  • I. Bhattacharjee, N. Ghosh, A. Raina, J. Dasgupta, D. Ray*, Conformational switching via an intramolecular H-bond modulates the fluorescence lifetime in a novel coumarin-imidazole conjugate", Phys. Chem. Chem. Phys. 2018, 20, 6060-6072.
  • J. T. Foy, D. Ray, I. Aprahamian, "Regulating signal enhancement with coordination- coupled deprotonation of a hydrazone switch", Chem. Sci., 2015, 6, 209-213.
  • D. Ray, J. T Foy, R. P. Hughes, I. Aprahamian, "A Switching cascade of hydrazone-based rotary switches through coordination-coupled proton relays", Nat. Chem., 2012, 4, 757-762.

  • Two Birds with One Stone: Blue- and Orange-TADF in A Single emissive Layer Leading to White Light Emission, Nirmalya Acharya, Manoj Upadhyay, Suvendu Dey, Debdas Ray* (ACS  2022).
  • Thermally Reversible Dual Emission and out of equilibrium Achieved by A Thermal-Induced Conformational Change in Halogen-Substituted Phenothiazine-Quinoline Conjugates, Nirmalya Acharya, Manoj Upadhyay, Suvendu Dey, Debdas Ray* (Nature Group 2022).
  • A New Approach Exploiting Planar Donor-Acceptor-Donor Molecules to Achieve Violet-and-Blue Room-Temperature Dual-Phosphorescence, Raktim Deka, Sakshi Chawla, Suvendu Dey, Nirmalya Acharya, Manoj Upadhyay, Arijit Kumar De, Debdas Ray* (Under Review in Nature Group).
  • Impact of Triplet-to-Triplet Energy Transfer on Delayed Fluorescence with Inverted Singlet-Triplet State, Suvendu Dey, Manoj Upadhyay, Debdas Ray* (Under preparation, Nature Group).

  • Invisible security ink has been launched in Shiv Nadar University, Samagya, 03 February 2020.
  • Shiv Nadar University develops invisible security ink, The Echo of India, 01 February  2020.
  • Shiv Nadar University’s security ink, Arthik Lipi, 01 February 2020.
  • Security Ink, The Statesman, 02 February 2020.
  • Shiv Nadar university to develop invisible ink, Dainik Vishwamitra, 02 February 2020.
  • Vanish Ink, Aajkaal, 5 February 2020.
  • Researchers at Shiv Nadar University Develop an Invisible Security Ink, India Education Diary, 28 January 2020.
  • Shiv Nadar University Researchers Develop An Invisible Security Ink, BE Education, 27 January 2020.
  • New invisible ink may help detect fake currency, The Hindu Business Line, December 31 2019.
  • Novel ‘invisible ink’ may help detect fake currency, Udayavani, 31 December 2019.
  • Novel ‘invisible ink’ may help detect fake currency, The Hitavada, 31 December 2019.
  • Invisible ink’ may help detect fake currency, Daily Excelsior, 30 December 2019.
  • Novel ‘invisible ink’ may help detect fake currency, The tribune, 30 December 2019.
  • Novel Invisible Ink' May Help Detect Fake Currency, Daily Hunt, 30 December 2019.
  • Novel invisible ink’ may help detect fake currency, NYK Daily, 30 December 2019.
  • Novel invisible ink’ may help detect fake currency, Democratic Accent, 30 December 2019.
  • Now 'invisible ink' will identify fake currency, Financial Express, 30 December 2019.
  • Invisible ink will tell the difference between real and fake, Amar Ujala, 30 December 2019.
  • Unique 'invisible ink' can help identify fake notes, these are the characteristics, Lokmat, 30 December 2019.
  • Unique 'invisible ink' can help identify fake notes, these are the characteristics, India, 30 December 2019.
  • Special ink developed by scientists costs less but is more secure, can help detecting fake currency, First post, 30 December 2019.
  • Indian university has prepared unique ink, will identify fake notes, News 18, 30 December 2019.
  • Novel Invisible Ink' May Help Detect Fake Currency, Republic world, 30 December 2019.
  • Novel ‘invisible ink’ may help detect fake currency, Devdiscourse,  30 December 2019.
  • Noida scientists develop novel 'invisible ink' to detect fake currency, Indian Money, 30 December 2019.
  • Noida scientists develop novel ‘invisible ink’ to detect fake currency, Financial Express, 30 December 2019.
  • Novel ‘invisible ink’ may help detect fake currency, Decan Herald, 30 December 2019.
  • Novel invisible ink' may help detect fake currency, Business Standard, 30 December 2019.
  • Novel Invisible Ink' May Help Detect Fake Currency, BW Business World, 30 December 2019.
  • Novel ‘invisible ink’ may help detect fake currency, Outlook, 30 December 2019.
  • Invisible ink may help detect fake currency, Free Press Journal, 30 December 2019.

  • Invited lecture, organized by IISER Mohali, 9 June 2022, India.
  • Future Oriented Research Conferences & Exhibitions (FORCE)-Interdisciplinary Initiatives in Chemical Sciences (IICS), Jaypee Palace, Agra, July 28 - 31, 2022, organized by IISER Kolkata, IIT Kanpur, and IISER Bhopal, India.
  • Functional Smart & Supramolecular Materials (FSSM-2020)”, 29-30 January 2020, organized by the Department of Chemistry, Indian Institute of Technology, Kharagpur, India.
  • Modern Trends in Inorganic Chemistry” (MTIC-XVIII), IITG, 11-14 December 2019, India.
  • JNCSAR-SNU Symposium on Material Science and their application, JNCSAR, Bangaluru,  8-9 November 2019.
  • Organic chemistry symposium, OCS-2019@Hyatt Regency, Lucknow, organized by IITK & IISER Bhopal, 13-14 September 2019.
  • ACS Publications Forum: Expanding Frontiers in Chemical Science, 01 November 2018, Banaras Hindu University (BHU), Varanasi, India.
  • Invited Lecture, School of Physical Science, JNU, 12 September 2018, India.
  • Modulation of Emission Signaling Pathway through Allosteric control, TIFR Mumbai, July, 19-21, 2017.
  • Fluorescence Spectroscopy and its Application, IIT Kanpur, 23-28 November 2015.
  • "A multistep switching cascade of hydrazone-based switches through coordination coupled proton relays" - Invited lecture in Calcutta University, 7 April 2014, India.
  • National Seminar on Crystallography 43A, 28-30 March 2014, Indian Institute of Science Education and Research (IISER) Mohali, India.

  • "Organic High efficient Biluminescent materials for data security applications", Funding Agency, DST-SERB; Principal Investigator, Dr. Debdas Ray; Budget amount: ₹ 40,43,120.00; Duration: 3 Years (2021-2023) (On-going).
  • “Solid-state luminescence active ultra-rigid neutral coordination complex of zinc(II) and  aluminium(III)”, Funding Agency, DST-SERB; Principal Investigator, Dr. Debdas Ray; Budget amount:  ₹ 25,92,000.00; Duration: 3 Years (completed) (2015-2018).
  • “Dihedral angle controlled functionalized luminescence materials for optoelectronic  applications”, Funding Agency: DST-SERB; Principal Investigator, Dr. Debdas Ray; Budget Amount: ₹ 49,53,960.00; Duration: 4 Years (completed) (2016-2020).
  • "Angularly Distributed Donor-Acceptor Based Chromophore: Simple System for Sophisticated NLO effect", Funding Agency: BRNS, DAE, Principal Investigator, Dr. Debdas Ray; Budget Amount: ₹ 24,10,650.00; Duration: 3.1 Years (2018-2022) (completed).