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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

  • 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).                  

Courses Taught/Teaching

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. (01-Ongoing)

1. Manish Kumar Singh

M.Tech Thesis: 03 (02 completed, 01-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)

IMD/IDD (4th Year) Project : 02 (completed-as co-supervisor)

IDD (3rd Year) Project : 01 (ongoing-as supervisor)

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