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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:
Luminescent Materials and Device Development

  • Laser Spectroscopy/Photon Upconversion/Steady State and Transient Photoluminescence
  • Luminescent Nanostructures:
    • Lanthanide based Oxide and Fluoride Phosphors; Quantum Dots; Plasmonic Nanoparticles  
    • Lanthanide-Organic Complexes & Hybrid/Composite Nanostructures
    • NIR Persistent/Photostimulable Phosphors
    • Inorganic Halide Perovskites
  • Optical-Imaging/Bio-Imaging/Upconversion Microscopy
  • Optical Data Storage & Security applications
  • Spectral Conversion/Solar energy harvesting
  • Light Emitting Diodes (LEDs) 
  • Sensors (Temperature, Gas & Biological)

Some Representative Publications after Joining IIT (BHU): (* Corresponding Author)

S.No. Publication Detail Impact Factor
1 Lanthanide-doped Inorganic Halide Perovskites (CsPbX3): Novel Properties and Emerging Applications
Santosh Kachhap, Sachin Singh, AK Singh, SK Singh*, J. Mater. Chem. C 10, 3647, (2022)
2 Generation of red-NIR bi-modal fluorescence in hybrid nanostructure.
P Singh, SK Singh*, et al, Mat. Res. Bull., 122, 110663 (2020) 
3 Lanthanide doped ultrafine hybrid nanostructures: multicolour luminescence, upconversion based ET and luminescent solar collector applications.
P Singh, PK Shahi, SK Singh*, et al, Nanoscale, 9, 696 (2017). 
4 A strategy to achieve efficient dual-mode luminescence in lanthanide-based magnetic HNPs and its demonstration for the detection of latent fingerprints.
PK Shahi, P Singh, AK Singh, SK Singh, et al, Journal of Colloid and Interface Science, 499, 199 (2017)
5 Photoluminescence, upconversion and quantum-cutting emission in Tm/Tb/Pr and Yb co-doped oxide phosphor: A comparative study
P. Singh, P.K. Shahi, S.K. Singh*, et al, J. Alloys Comp. 681, 477 (2016)
6 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).
7 Revelation of the technological versatility of the Eu(TTA)3Phen complex by demonstrating energy harvesting, ultraviolet light detection, temperature sensing, and laser applications.
PK Shahi, A. K. Singh, S. K. Singh, et al, ACS Appl. Mater. Interf. 7 , 18231 (2015).
8 Eu3+ activated CaGa2O4 wide band gap material for solar blind UV converter: Fluorescence and photo-conductivity performance.
M Rai, SK Singh*, K Mishra, et al, J. Mater. Chem. C 2, 7918 (2014).
9 New perspectives in garnet phosphors: low temperature synthesis, nano-crystalline structure, and observation of multi-mode luminescence.
K. Mishra, S. K. Singh*, A. K. Singh, et al, ACS Inorganic Chemistry, 53, 9561 (2014) 
10 Red and near infrared persistent luminescence nano-probes for bio-imaging and targeting applications.
SK Singh*, RSC Advances 4, 58674 (2014).

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 Perovskites
3. Ms. Shruti (Prime Minister's Research Fellow-PMRF); Luminescence Nanostructures for Optical Encoding 
4. Ms. Shanas Fatima (Teaching Assistant): Materials for Energy Applications 
5. Mr. Prem Chandra Bharti (Teaching Assistant) [Co-supervisor]
6. Ms. Manisha Sharma (CSIR-JRF)  [Co-supervisor]
7. Ms. Gargi (UGC-JRF)  [Co-supervisor]

Master (M.Tech/M.Sc) Students

1. Mr. Niglum N (2022-23) [M.Sc.]; Colloidal quantum dots as platform for Quantum Information
2. Mr. Abhay Kumar Gaurav [UG Project]; Two photon upconversion in lanthanide nanocrystals

Former Members:

Masters (M.Tech & MSc.)

  1. Mr. Dhruv Bargujar (2015-16); Insight into the bright side of defects: study of persistent luminescence 
  2. Mr. 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
  6. Mr. Saurabh Jha (21-22) [M.Sc.]; Photon upconversion in lanthanide materials


  • UG Projects
  1. Ms. Priyanka Baa
  2. Mr. Ishank Kumar Mittal
  3. Mr. Dhruv Bargujar
  4. Mr. Pawan Malviya (Co-Supervisor)
  • Exploratory Projects
  1. Mr. Manish Nonha 
  2. Mr. Subhro Das
  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]
  4. High Proton conducting metal phosphonate electrolytes for fuel cell applications, DRDO (22-23): Cost 41.20 Lakhs [Co-PI]


  1. DST-Inspire Faculty Award, DST, New Delhi (2013-2017)
  2. Post-Doctoral Fellowship (PDF), Changwon National University, South Korea (2011-2012)
  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 (2009-2011)
  6. Junior & Senior Research Fellowships (JRF & SRF), DFSS, MHA, New Delhi (2006-2009)


  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. Laser Spectroscopy for Biological Applications, National Symposium on ‘Laser in Biology, Medical Science, Atmospheric Science and Climate Change’ Physics Department, Udai Pratap College, Varanasi, Mar. 14-15, 2022. 
  2. Upconversion Spectroscopy, Virtual Workshop on Probing Materials using Spectroscopic Tools: Basics and Applications, MAHATMA GANDHI CENTRAL UNIVERSITY, Motihari, Bihar, Feb. 28-Mar 04, 2022
  3. Photoluminescence spectroscopy and its applications, Short Term Course on ‘Spectroscopy and its Applications in Modern Science’ (STC9-21), Doctor Hari Singh Gour Vishwavidyalaya, Sagar, India (A Central University), 18th-24th Feb. 2022.
  4. Photon upconversion in lanthanide doped nanostructures & their applications, IIT and NIMS Materials Science Workshop, supported by JST SAKURA Science Program, Japan, 6-10 Dec. 2021.
  5. Upconversion Spectroscopy of nanomaterials, International Conference on Smart Materials for Sustainable Technology (SMST 2020), NIT Goa, Goa, 22-26 Feb. 2020.
  6. 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.
  7. 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. 
  8. 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.
  9. 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
  10. 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
  11. Lanthanide doped nanostructure for multi-modal emission and their applications, Indian Science Congress, Physical Science section, Mumbai University, 3-7 Jan. 2015.
  12. 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
  13. 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.