Dr. THEJAS K. K.

ACADEMIC DETAILS

Degree	Institution	Board/ University	% Marks	Year
Ph.D.	CSIR - National Institute For Interdisciplinary Science and Technology (NIIST), Trivandrum	Academy of Scientific and Innovative Research	NA	2019 - 2024
M.Sc. in Physics	Nirmalagiri College Kuthupramaba, Kannur	Kannur University, Kannur	74.6	2016-2018
B.Sc. in Physics	Mahathma Gandhi College Iritty	Kannur University, Kannur	90.25	2013-2016
12^th	K.P.C.H.S.S. Pattanur	State Board KERALA	91.5	2011-2012
10^th	K.P.C.H.S.S. Pattanur	State Board KERALA	95	2010-2011

TEACHING EXPERIENCE

June 2024 to till date SES college Sreekandapuram

RESEARCH EXPERIENCES

Designation	Funding organization	Working Institution	Job Description	Period
Senior Research Fellow	CSIR	CSIR-NIIST, Trivandrum	Crystal engineered deep red to NIR emitting and persistent phosphors for bio imaging and security applications	Jan 2021- Oct 2024
Junior Research Fellow	CSIR	CSIR-NIIST, Trivandrum	Developing deep red emitting phosphor for plant growth and Warm WLED applications. Developing magnetic materials for spintronic applications.	Jan 2019-Jan 2021
M.Sc. Project	Course work project	Nirmalagiri College Kuthupramaba, Kannur	Synthesis of Nickel Copper Alloy by solution combustion method	Aug 2016 - May 2018

Ph.D. RESEARCH DETAILS

Institution: CSIR-NIIST, Trivandrum, India

Supervisor: Dr. Subrata Das, Principal Scientist, CSIR-NIIST

Title of the Thesis: Non-rare earth-based new class of inorganic phosphors for lighting, medical imaging and security applications

Research Description:

Developed wide band gap oxide-based luminescent materials with high EQE for lighting and display applications.
Developed deep red/NIR emitting rare earth free phosphors by a scalable approach for cost-effective bio-imaging applications.
Designed and developed persistent phosphors for security applications.
Developed phosphors for indoor plant cultivation growth applications.
Mentored and trained MSc students in their master projects.
Directly involved in lab management and major instrumental operations (XRD, Spectrofluorometer, CCD spectrometer, FTIR, Microwave facilities, etc.)

TECHNICAL SKILLS

Spectroscopy techniques: Photoluminescence, UV-Vis-IR spectroscopy, FTIR, Raman.
Structural: Powder XRD, Thin film XRD, XPS.
Synthesis: Tube furnace with inert and reduction facilities, microwave synthesizer, microwave digester, muffle furnace, Ball Milling etc.
Synthetic skills: Solid state, Sol-gel, Solution Combustion, Hydrothermal, Microwave-assisted methods.
Data analysis: Origin 8.5, X'Pert HighScore Plus, Ocean Optics, XRD refinement, X-pert High Score plus, GSAS2

GRANTS/AWARDS/RECOGNIZATION RECEIVED

Qualified CSIR-JRF and NET in June 2017.

PUBLICATIONS IN INTERNATIONAL PEER-REVIEWED JOURNALS
1.	Thejas K. K.; Abraham M.; Kunti A. K.; Tchernycheva M.; Ahmad S; Das S. Review on Deep Red-Emitting Rare-Earth Free Germanates and Their Efficiency as Well as Adaptability for Various Applications. *Appl. Mater. Today* 2021, 24, 101094. (IF: 8.663).
2.	Thejas K. K.; Abraham, M.; Kunti, A. K.; Amador-mendez, N.; Tchernycheva, M.; Das, S. Enriching the Deep-Red Emission in ( Mg , Ba )₃M₂GeO₈ : Mn⁴⁺ ( M = Al , Ga) Compositions for Light-Emitting Diodes. *ACS Appl. Mater. Interfaces* 2023, 15, 5, 7083–7101.(IF: 10.383)
3.	Thejas K.K., Sariga C Lal, Reshmi Thekke Parayil, Santosh K. Gupta, Subrata Das^,Defect-induced new persistent cyan emitting rare-earth free phosphor for dynamic anti-counterfeiting and plant growth LED applications, *J. Mater. Chem. C*, 2025,13, 3554-3566 (IF: 5.7)
4.	Thejas K. K.; Supin, K. K.; Akshay, V. R.; Arun, B.; Mandal, G.; Chanda, A.; Vasundhara, M. Effect of Annealing Time on Structural, Optical and Magnetic Properties of TiO₂ Nanoparticles. *Opt. Mater. (Amst).* 2022, 134 (PA), 113178. (IF: 3.9)
5.	Malini Abraham, Thejas K.K., Arup K. Kunti, Nuño Amador-Mendez, Roberto Hernandez, J. Duras, Nishanth K.G., Sushanta Kumar Sahoo, Maria Tchernycheva, Subrata Das Strategically Developed Strong Red-Emitting Oxyfluoride Nanophosphors for Next-Generation Lighting Applications, *Advanced Optical Materials*, 2024 , 12(30):2401356. , (IF: 9).
6.	Malini Abraham, A.K. Kunti, Thejas K. K., N. Amador-Mendez, N. Gogneau, N. K.G., M. Tchernycheva, S. Das, The elevated colour rendering of white-LEDs by microwave-synthesized red-emitting (Li, Mg)3RbGe8O18: Mn4+ nanophosphors, Dalton Transactions*, 2021,50, 3044-3059 (IF: 4.0).
7.	Mukesh, M.; Thejas K. K.; Akshay, V. R.; Arun, B.; Vasundhara, M. Effect of Annealing Conditions on Particle Size, Magnetic and Optical Properties of Gd2O3 Nanoparticles Effect of Annealing Conditions on Particle Size , Magnetic and Optical Properties of Gd₂O₃ Nanoparticles. AIP Conf. Proc. 2019, 2162, 020091.
8.	Supin K K,; Anson George,; Y. Ranjith Kumar,; Thejas K. K.,; Guruprasad Mandal, Anupama Chanda,; M. Vasundhara. Structural, optical and magnetic properties of pure and 3d metal dopant-incorporated SnO2 nanoparticles. *RSC Adv*., 2022, 12, 26712. (IF: 3.9)
9.	Gopal, R.; Nidhisha, V.; Amrutha, T. P.; Aswathi, A. A.; Midhila, P.; Thejas K. K.; Das, S.; Kizhakayil, R. N. Aggregation-Induced White Light Emission and Solvent-Induced Dual Mode Multi-Analyte Sensing by Highly Crystalline Single Component Derived N , S Co-Doped Carbon Nanodots. *ACS Appl. Opt. Mater.* 2023, 1, 3, 701–714.

CONFERENCES
1.	Thejas K. K., Malini Abraham Subrata Das “Enriching the deep red emission in (Mg, Ba)₃M₂GeO₈: Mn⁴⁺ (M=Al, Ga) compositions for light-emitting diodes” National Conference on Advanced Materials and Manufacturing Technologies (AMMT 2023), CSIR NIIST, Trivandrum, India, February 23-24, 2023 (Poster Presentation)
2.	Thejas K. K., Mukesh M, V R Akshay, B Arun, M Vasundhara. Tailoring the magnetic and optical properties of TiO2 nanocrystals derived from sol-gel techniques via different annealing conditions. International Conference on Advanced Materials (ICAM 2019), 12–14 June, 2019, Nirmalagiri college, Kannur, Kerala, India. (Poster Presentation)
3.	Malini Abraham, Thejas K. K, Subrata Das “Elevating the Quality of White Light Utilizing an Innovative Deep Red Emitting Nanophosphor” International Conference on Chemistry and Applications of Soft Materials (CASM 2022), CSIR NIIST, Trivandrum, India, July 25-27, 2022 (Poster Presentation)
4.	Mukesh M, Thejas K K, Arun B, and Vasundhara M. “Tuning the Magnetic and Magnetocaloric Properties in Bi Substituted La_0.67Sr_0.33MnO₃ Manganites for Magnetic Refrigeration Applications Third International Conference on Advanced Materials (ICAM 2019), Mahatma Gandhi University, Kottayam, Kerala, India, 9-11 August 2019 (Poster Presentation)