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Dr. Sunil Kumar Singh
Assistant Professor
Department of Physics, IIT (BHU) Varanasi
Area of Interest: 
Laser Spectroscopy; Photon Upconversion; Nanostructures for Optical Imaging, Optical Data Storage, Energy Harvesting, Anti-Counterfeiting and Sensor Applications.

I am working as an Assistant Professor in the Department of Physics, IIT (BHU), Varanasi since Feb. 2018. My research interest is focused on optical spectroscopy of different types of materials and their technological applications mainly in the area of optical imaging, optical data storage, energy harvesting and sensors. After completing my Ph.D. from Department of Physics, Banaras Hindu University (2011), I moved to the Department of Physics, Changwon National University, South Korea for post-doctoral studies (2011-12). I returned back India to take up a DST-INSPIRE Faculty position at Department of Physics, IIT (BHU) Varanasi  and worked as INSPIRE Faculty for the period (2013-2017).

Major Research Areas

  • Laser Spectroscopy/Photon Upconversion 
  • Luminescent Nanostructures: Lanthanide based Phosphors, Quantum Dots, Plasmonic Nanoparticles 
  • Organic Complexes & Hybrid/Composite Nanostructures
  • NIR Persistent/photostimulable Phosphor
  • Optical-Imaging/Bio-Imaging/Upconversion Microscopy
  • Optical Data Storage and Security applications
  • Spectral Conversion/Solar energy harvesting
  • Sensors

Some Representative Publications: (* Corresponding Author)

  • Generation of red-NIR bi-modal fluorescence in hybrid nanostructure, P Singh, SK Singh*, et al, MRB, 122, 110663 (2020) [IF=4.64]
  • Wide-bandgap lanthanide niobates: Optical properties and applications, A Dwivedi, AK Singh, SK Singh*, MRB 131, 110960 (2020) [IF=4.64]
  • Lanthanide doped ultrafine hybrid nanostructures: multicolour luminescence, upconversion based energy transfer and luminescent solar collector applications, P Singh, PK Shahi, SK Singh*, et al, Nanoscale, 9, 696 (2017). [IF=7.79]
  • Laser-induced excited-state crossover and spectral variation of Cr3+ in the high-crystal-field environment of CaGa2O4, M Rai, SK Singh*, P Morthekai, Optics Letters, 41, 3635 (2016). [IF=3.78]
  • Enhanced red upconversion emission, magneto-luminescent behavior, and bio-imaging application of NaSc0.75Er0.02Yb0.18Gd0.05F4@AuNPs nanoparticles, M Rai, SK Singh*, K Mishra, et al, ACS Appl. Mater. Interf. 7 (28), 15339 (2015). [IF=9.22]
  • Eu3+ activated CaGa2O4 wide band gap (WBG) material for solar blind UV converter: Fluorescence and photo-conductivity performance, M Rai, SK Singh*, K Mishra, et al, JMC C 2, 7918 (2014). [IF=7.06]
  • Probing dual mode luminescence of Eu3+ in garnet phosphor, SK Singh, DG Lee, SS Yi, et al JAP 113, 173504 (2013). [IF=2.55]
  • Eu3+ activated novel alkaline earth metal gallium oxide phosphors Sr(2.92-X)Ca(X)Ga2O6:Eu3+ for light emitting diodes, S. K. Singh, M. J. Kim, C. H. Moon, et al, MRB 47, 2627, (2012). [IF=4.64]
  • Efficient dual mode multicolor luminescence in lanthanide doped hybrid nanostructure: A multifunctional material, SK Singh, AK Singh, SB Rai, Nanotechnology 22, 275703 (2011). [IF=3.87]
  • Magnetic field induced optical bistability in multifunctional Gd2O3: Er3+/Yb3+ upconversion nanophosphor, SK Singh, K Kumar, MK Srivastava, et al, Optics Letters 35, 175 (2010). [IF=3.78]     

Current Semester:

PHY-101 Classical, Quantum & Relativistic Mechanics​
AP-4103-Quantum Electronics
PYM 541: Laser Physics (M.Sc.)
PYM 591: Spectroscopy Lab (M.Sc.)


Theory Courses

PHY-101/AP-1101/1201 Classical, Quantum & Relativistic Mechanics
PHY-103 Modern Physics
EP-342 Biophysical Techniques
AP-3202 Atomic Physics & Nucl. Engg.
AP-4103-Quantum Electronics
EP-432/AP-5104/AP-7107-Photonics & Optoelectronics
PYM 541: Laser Physics (M.Sc.)
AP-7111-Advanced Materials Characterization Techniques (Ph.D. Course work)
Lab Courses-

AP-1301/1401- Mechanics Lab
AP-1401/1402- Electricity & Optics Lab
AP-4301: Physics Lab, IMD-IVthyear
AP-4401: Physics Lab, IMD-IVthyear
PYM 591: Spectroscopy Lab (M.Sc.)

Research Scholars: 
1. Mr. Sachin Singh (INSPIRE Fellow); Nanostructures for Energy Harvesting
2. Mr. Santosh Kachhap (JRF-CSIR); Lanthanide Doped Halide Perovskite Quantum Dots
3. Ms. Shruti (Teaching Assistant); Persistent Luminescence Nanostructures
4. Mr. Prem Chandra Bharti (Teaching Assistant) [Co-supervisor]
5. Ms. Manisha Sharma (CSIR-JRF)  [Co-supervisor]
6. Ms. Gargi (UGC-JRF)  [Co-supervisor]

Master (M.Tech/M.Sc) Students
1. Mr. Saurabh Jha (2021-22) [M.Sc.]; Photon upconversion in lanthanide materials

Former Members (IDD/MSc.)
1. Dhruv Bargujar (2015-16); Insight into the bright side of defects: study of persistent luminescence 
2. Chittyreddy Sripal (2016-17); Optical properties of lanthanide doped phosphors 
3. Ms. Priyanka Baa (19-20); Lanthanide doped material for energy harvesting applications
4. Mr. Ishank Kumar Mittal (20-21); Dual mode emission in lanthanide-doped nanostructures
5. Ms. Suchita Kumari (20-21) [M.Sc.]; Photon Upconversion in Lanthanide Nanostructure
UG Projects :- 04 Completed
Exploratory Projects:- 02 Completed 

  1. Rare-earth doped luminescent nanostructures for bio-imaging and photovoltaic applications, INSPIRE Award Project, DST, New Delhi, (2013-18): Cost 35 Lakhs 
  2. Development and study of luminescent nanostructures as spectral converters for solar cell applications, Seed Grant, IIT(BHU) (2018): Cost: 10 Lakhs
  3. Tailoring correlations of light using plasmonic and nano structures, BRNS (2021-23): Cost 33.70 Lakhs [Co-PI]


  1. DST-Inspire Faculty Award, DST, New Delhi (2013)
  2. Post-Doctoral Fellowship (PDF), Changwon National University, South Korea (2011)
  3. CSIR-NEHRU PDF, CSIR, New Delhi (awarded, did not availed)
  4. DS Kothari PDF, UGC, New Delhi (awarded, did not availed)
  5. Senior Research Fellowship (SRF), CSIR, New Delhi (2009)
  6. Junior & Senior Research Fellowships (JRF & SRF), DFSS, MHA, New Delhi (2006)


  1. Listed in “World’s Top 2% Scientists List” of Stanford University” under “Nanoscience and Nanotechnology” Category. (2020)
  2. M.L. Khorana Memorial Prize, Indian Pharmaceutical Association, Mumbai (2012) []
  3. Young Scientist Award, Indian Science Congress Association, India (2010) []
  4. Gold Medal, Ist rank in M.Sc. in Physics (2004)
  5. Best Paper presentation Awards in Conference/Seminar/Symposium:
  •  2nd International Conference on Soft Materials, MNIT, Jaipur, India (2016)
  •  National Symposium on Advances in Lasers and Spectroscopy (Harbansh Singh Memorial Young Scientist Award), Dr. H. S. Gaur Central University, Sagar, India (2009)
  •  One day Conference on New Trends in Research, BHU, Varanasi, India (2007) 

Membership of Professional Bodies:

  1. Member of Indian Science Congress Association (Life Member, Membership No. L14296)
  2. Member of Laser & Spectroscopy Society of India (Life Member, Membership No. 315-08)
  3. Member of Society for Interdisciplinary Research in Materials and Biology (Life Member, Membership No: LT-023)
  4. Member of Royal Society of Chemistry (annual member by invitation, Membership No. 584365)

Invited Talks

  1. Upconversion Spectroscopy of nanomaterials, International Conference on Smart Materials for Sustainable Technology (SMST 2020), NIT Goa, Goa, 22-26 Feb. 2020.
  2. Hybrid nanostructures for the generation of red-NIR bimodal emission covering the first biological window, in International Symposium on Photonics and Plasmonics (ISPP-2019), at Department of Physics, Central University of Rajasthan, Kishangarh, Ajmer, 23-24 September 2019.
  3. Infrared to infrared photon upconversion through photo-stimulated luminescence, in a National Conference on Advanced Nanomaterials and their applications (ANA-2018), at Motilal Nehru National Institute of Technology (MNNIT) Allahabad, 21-23 Dec. 2018. 
  4. Photon conversion using coherent and incoherent light sources for strategic applications in National Conference on Advances in Spectroscopy: Molecules to Materials at Institute of Infrastructure Technology Research and Management Ahmedabad, 05/10/2018.
  5. Photon management (up and down-conversion) using coherent and incoherent light sources” in the National Conference on Advances in Spectroscopic Techniques and Materials (ASTM-2018)” at Indian Institute of Technology (ISM) Dhanbad, India., 14-16 March, 2018
  6. Lanthanide doped magneto-luminescent nanostructures for upconversion microscopy”, in a National Symposium on Horizons of light in molecules, materials and daily life, held at Dr. H. S. Gour University, Sagar, MP, 18-19 Dec., 2015
  7. Lanthanide doped nanostructure for multi-modal emission and their applications, Indian Science Congress, Physical Science section, Mumbai University, 3-7 Jan. 2015.
  8. Physics of multi-mode emission: Optical properties of rare-earth doped phosphors”, Banaras Hindu University, Varanasi, India, Winter School on Advances in Laser Spectroscopy and Applications, Physics Department, Banaras Hindu University, Varanasi, 22-28 March, 2014
  9. Low temperature synthesis, nano-crystalline structure and observation of dual-mode luminescence, Indo-German Conference on Laser application and Nanoscience, Kerla, 5-7, Dec. 2013.