's picture
Dr. Sunil Kumar Singh
Assistant Professor
Department of Physics, IIT (BHU) Varanasi
Area of Interest: 
Laser Spectroscopy, Photon upconversion and quantum-cutting luminescence, upconversion based optical imaging, Materials for energy harvesting 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, 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

  • Photophysics of lanthanide doped Nanostructures/nano-colloids
  • Laser Spectroscopy/frequency upconversion/Quantum-cutting
  • Oxide and fluoride luminescent nanophosphors
  • Quantum Dots
  • Lanthanide based Organic complexes & Hybrid/composite Nanostructures
  • NIR persistent/photostimulable phosphor
  • Spectral conversion/solar energy harvesting
  • Optical-imaging/Bio-imaging/Upconversion microscopy

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)
  • 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).
  • 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).
  • 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).
  • 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, Journal of Material Chemistry C 2, 7918 (2014).
  • Probing dual mode luminescence of Eu3+ in garnet phosphor, SK Singh, DG Lee, SS Yi, et al Journal of Applied Physics 113, 173504 (2013).
  • Efficient dual mode multicolor luminescence in lanthanide doped hybrid nanostructure: A multifunctional material, SK Singh, AK Singh, SB Rai, Nanotechnology 22, 275703 (2011).
  • 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).                  

Current Semester:

PHY-101 Classical, Quantum & Relativistic Mechanics​
EP-342 Biophysical Techniques​
Mechanics Lab for PHY-101 Course &
PL lab for EP-101 Course


Theory courses

AP-1101/1201 Classical & Quantum Mechanics
PHY-101 Classical, Quantum & Relativistic Mechanics
PHY-103 Modern Physics
AP-2202 Fluid Dynamics
EP-342 Biophysical Techniques
AP-3202 Atomic Physics & Nucl. Engg.
AP-4103-Quantum Electronics
EP-432/AP-5104/AP-7107-Photonics & Optoelectronics
AP-7111-Advanced Materials Characterization Techniques
Lab Courses-

AP-1301/1401- Mechanics Lab
AP-1401/1402- Electricity & Optics Lab
AP-4301: Physics Lab, IMD-IVth year
AP-4401: Physics Lab, IMD-IVth year

Ph.D. (02-Ongoing)

1. Sachin Singh (INSPIRE Fellow)
2. Santosh Kachhap (JRF-CSIR)

M.Tech Thesis: 05(02 completed, 03-ongoing)

1. Insight into the bright side of defects: study of persistent luminescence; Dhruv Bargujar (2015-16)
2. Optical properties of lanthanide doped phosphors; Chittyreddy Sripal (2016-17)

1. Ms. Priyanka Baa
2. Mr. Ishank Kumar Mittal
3. Ms. Ashi Ali (Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia)​

UG Projects :- 04: 03 (completed) 01 (ongoing)
Exploratory Projects:- 02: 01 (completed) 01 (ongoing)​

1. Rare-earth doped luminescent nanostructures for bio-imaging and photovoltaic applications, DST-INSPIRE Project, DST, New Delhi, (2013-2018): Cost 35 Lakhs     

Invited Talks

  1. 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.
  2. 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. 
  3. 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.
  4. 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
  5. 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
  6. Lanthanide doped nanostructure for multi-modal emission and their applications, Indian Science Congress, Physical Science section, Mumbai University, 3-7 Jan. 2015.
  7. 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
  8. 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.