Physical Chemistry Research

Structural, Optical and Morphological Studies of TiO2 Incorporated MgZn2(PO4)2 Nanophosphors by Solid-state Reaction

Document Type : Regular Article

Authors

B Sumalatha 1
Ch Rajyasree 2
K.V.Pavana Kumari 3
Sandhya Cole 4

1 Department of Physics, SVKM’s NMIMS Deemed to be University, Hyderabad-509301, India

2 Mishran Semiconductor Pvt Ltd, Hyderabad-500089, India

3 Department of Anatomy, Government Medical College, Ongole-523001, A.P., India

4 Department of Physics, Acharya Nagarjuna University, Guntur-522510, India

https://doi.org/10.22036/pcr.2025.523118.2683
Abstract
Ti3+ ions of different concentrations (0.3 & 0.6) doped MgZn2(PO4)2 nanophosphors were synthesized by the solid state reaction method. The synthesized samples were characterized by X-ray diffraction, Field Emission scanning electron microscope (FE-SEM) with Energy dispersive X-ray analysis (EDAX), High-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FT-IR), Diffuse reflectance spectroscopy (DRS), and Photoluminescence. In both concentrations, particle sizes were distributed between 15 to 23 nm from XRD analysis. The crystallite structure is monoclinic, and the space group is P21/n. The FE-SEM and HR-TEM micrographs show spherical shapes with different agglomerations. The elemental composition is verified by the EDAX spectrum. The FT-IR spectrum exhibited different vibrational bands corresponding to PO43-, P-O-P, and other modes. DRS analysis, samples exhibit energy band gap values were 3.32 and 3.29 eV for Ti3+ ions of 0.3% and 0.6% respectively. The energy band gap results support DRS data that the doping percentage increases the energy band gap values decreases. The produced sample exhibits peaks at 358, 377, and 405 nm in ultraviolet, at 432 nm in the blue regions of its PL. Photometric parameters such as CCT, CIE chromatic coordinate, and color purity reveal that prepared samples could be used in LED applications.

Graphical Abstract

Structural, Optical and Morphological Studies of TiO2 Incorporated MgZn2(PO4)2 Nanophosphors by Solid-state Reaction

Keywords

Nanophosphors
Ti3+ ion doped
Spectroscopy studies
Photoluminescence

Subjects

[1]  Borrego-Perez, J. A.; Gonzalez, F.; Meza-Avendano, C. A.; De Los Santos, I. M.; Lopez-Juarez, R.; Hernandez, I.; Alonso-Guzman, E. M.; Martinez-Molina, W.; Chavez-Garcia, H. L., Structural, optical and photoluminescence properties of TiO2 and TiO2: Tm3+ nano powders. Optik. 2021, 227, 166083, DOI: 10.1016/j.ijleo.2020.166083.
[2]  Daniel, K.; Naveen Kumar, B. V.; Nirmal Rajeev, Y.; Venkatarao, K.; Sandhya, C., Structural and optical characteristics of undoped and EU3+ doped MgZn2(PO4)2 nanophosphors. Phys. E. Low-dimens. Syst. Nanostructures. 2024, 159, 115911, DOI: 10.1016/ j. physe.2024.115911.
[3]   Wang, L.; Xu, M.; Zhao, H.; Jia, D., Luminescence, energy transfer and tunable color of Ce3+, Dy3+/Tb3+ doped BaZn2(PO4)2 phosphors. New. J. Chem. 2016, 4, 3086-3096, DOI: 10.1039/C5NJ03148F.
[4]  Xu, C.; Li, Y.; Huang, Y.; Yu, Y. M.; Seo, H. J., Luminescence characteristics and site-occupancy of Eu2+ and Eu3+ doped MgZn2(PO4)2 phosphors. J. Mater. Chem. 2012, 22, 5419-5426, DOI: 10.1039/ C2JM16352G.
[5]   Sreedevi, G.; Khaja Muswareen, Sk.; Jayalakshmi, V.; Sandhya, C., Effect of TiO2 doping on structural and optical properties of CdSZn3(PO4)2 nanocomposites. Appl. Phys. A. 2019, 125, 741, DOI: 10.1007/s00339-019-3037-3.
[6]   Khaja Muswareena, Sk.; Venkatarao, K.; Sandhya, C., Comparative Study of Crystallite Size from XRD and TEM Results for Pure and V2O5 Doped CdO-FePO4 Composite Nanophosphors. Phys. Chem. Res. 2023, 11(2), 241-251, DOI: 10.22036/pcr.2022.337333.2077.
[7]  Naveen Kumar, B. V.; Nirmal Rajeev, Y.; Esub Basha, Sk.; Venkatarao, K.; Ramachandra Rao, K.; Sandhya, C., Enhanced Luminescence and Energy Transfer of Bi3+/Dy3+ Co-doped La2Zr2O7 Nanophosphors for pc-LED Applications. Phys. Chem. Res. 2023, 11(1), 23-31, DOI: 10.22036/pcr.2022.333784.2050.
[8]   Srinivasa Rao, K.; Venkatarao, K.; Nirmal Rajeev, Y.; Sandhya, C., Structural, Optical, and Luminescence Studies of Sm2O3-Doped Cd2Sr(PO4)2 Nanophosphors. Phys. Chem. Res. 2023, 11(3), 501-510, DOI: 10.22036/ pcr.2022.343436.2110.
[9] Vasu, G.; Ch. Anjaneyulu, N.; Aswini, Ch.; Ravikumar. R. V. S. S. N., Structural, Optical and Photoluminescence Properties of Ti3+ Activated Li2Ba3(P2O7)2 Nanophosphor for Cool White LED Applications. Phys. Chem. Res. 2025, 13(2), 271-284, DOI: 10.22036/pcr.2025.488190.2590.
[10] Khaja Muswareen, Sk.; Subba Rao, M.; Sridevi, G.; Sandhya, C., Sol-gel synthesis of pure and TiO2 doped CdOFePO4 nano composites and investigation of their structural and optical properties. Mater. Sci. Semicond. Process. 2019, 102, 104588, DOI: 10.1016/ j. mssp.2019.104588.
[11] Seetharaman, A.; Sivasubramanian, D.; Gandhiraj, V.; Soma, V. R., Tunable Nanosecond and Femtosecond Nonlinear Optical Properties of C−N−S- Doped TiO2 Nanoparticles. J. Phys. Chem. C. 2017, 121, 24192-24205, DOI: 10.1021/acs.jpcc.7b08778.
[12] Serpone, N.; Lawless, D.; Khairutdinov, R., Size Effects on the Photo-physical Properties of Colloidal Anatase Tio2 Particles: Size Quantization or Direct Transitions in This Indirect   Semiconductor. J. Phys. Chem. 1995, 99, 16646-16654, DOI: 10.1021/j100045a026.
[13] Vella Durai1, S. C.; Kumar, E.; Muthuraj, D., Investigations on structural, optical, and impedance spectroscopy studies of titanium dioxide nanoparticals. Bull. Chem. Soc. Ethiop. 2021, 35(1), 151-160, DOI:  10.4314/bcse.v35i1.13.
[14] Hamdan, S. A.; Ibrahim, I. M.; Ali, I. M., Comparison of anatase and rutile TiO2 nanostructure for gas Sensing Application. Digest. J. Nanomater. Biostruct. 2020, 15(4) 1001-1008, DOI: 10.15251/ DJNB.2020.154.1001.
[15] Tiwary, C. S.; Sarkar, R.; Kumbhakar, P.; Mitra, A. K., Synthesis and optical characterization of mono-dispersed Mn2+ doped CdS nanoparticles. Phys. Lett. A. 2008, 372, 5825-5830, DOI: 10.1016/j.physleta.2008.07.036.
[16] Stokes, A. R.; Wilson, A. J. C., The diffraction of x-rays by distorted crystal aggregates-I. Proc. Phys. Soc. 1994, 56(3), 174-181, DOI: 10.1088/0959-5309/56/3/303.
[17] Tirumala Rao, G.; Babu, B.; Joyce Stella, R.; Pushpa Manjari, V.; Venkata Reddy, Ch.; Jaesool, S.; Ravikumar, R. V. S. S. N., Synthesis and Characterization of VO2+ doped ZnO-CdS composite nanophosphors. J. Mol. Struct. 2015, 1081, 254-259, DOI: 10.1016/j.molstruc.2014.10.044.
[18] Kondalkar, V. V.; Mali, S. S.; Pawar, N. B.; Mane, R. M.; Choudhury, S.; Hong, C. K.; Patil, P. S.; Patil, S. R.; Bhosale, P. N.; Kim, J. M., Microwave- assisted rapid synthesis of highly porous TiO2 thin films with nanocrystalline framework for efficient photo electrochemical conversion. Electrochim. Acta. 2014, 143, 89-97, DOI: 10.1016/j.electacta.2014.07.149.
[19] Al-Taweel, S. S.; Saud, H. R., New route for synthesis of pure anatase TiO2 nanoparticles via ultrasound assisted sol-gel method. J. Chem. Pharm. Res. 2016, 8(2), 620-626, DOI: 10.22202/jcpr.2016.10056
[20] Vella Durai1, S. C.; Kumar, E.; Muthuraj, D., Investigations on structural, optical and impedance spectroscopy studies of titanium dioxide nanoparticals. Bull. Chem. Soc. Ethiop. 2021, 35(1), 151-160, DOI: 10.4314/bcse.v35i1.13.
[21] Suresh, Y. V. K.; Chinna Anjaneyulua, N.; Rajendrakumar, A.; Chandarasekhar, A. V.; Ravikumar, R. V. S. S. N., Structural, Optical, and Luminescent Studies of Vanadyl Doped Strontium Tin Phosphate by Solid-state Reaction Method. Phys. Chem. Res. 2024, 12, 771-781, DOI: 10.22036/pcr.2024.396888.2338.
[22] Rajendra Kumar, A.; Ch. Anjaneyulu, N.; Vasu, G.; Ravikumar, R. V. S. S. N.; Arundhathi, N., Divalent copper ions‑doped strontium magnesium phosphate nanophosphors: synthesis and characterization. J. Mater. Sci: Mater. Electron. 2023, 34, 1958, DOI:  10.1007/s10854-023-11350-5.
[23] Nirmal Rajeev, Y.; Venkatarao, K.; Naveen Kumara, B. V.; Bhushan Kumar, L.; Sandhya, C., Structural and Morphological Studies on Strontium Tin Phosphate SrSn(PO4)2 Nanophosphors. Phys. Chem. Res. 2022, 10(2), 267-271, DOI: 10.22036/pcr.2021.300514.1953.
[24] Ismail, S. F.; Sahar, M. R.; Ghoshal, S. K., Effects of titanium nanoparticles on self-cleaning and structural features of zinc-magnesium-phosphate glass. Mater. Res. Bull. 2016, 74, 502-506, DOI: 10.1016/ j.materresbull.2015.11.022.
[25] Satyavathi, K.; Subba Rao, M.; Nagabhaskararao, Y.; Sandhya, C., Structural and spectral properties of undoped and tungsten doped Zn3(PO4)2ZnO nanophosphors. J. Phys. Chem. Solids. 2018, 112, 200-208, DOI: 10.1016/j.jpcs.2017.09.004.
[26] Choudhury, B.; Choudhury, A., Oxygen defect dependent variation of band gap, Urbach energy and luminescence property of anatase, anatase-rutile mixed phase and of rutile phases of TiO2 nanoparticles. Phys. E: low-Dimens. Syst. Nanostructures. 2013, 56, 364-371, DOI:  10.1016/j.physe.2013.10.014.
[27] Moulton, P. F.; Cederberg, J. G.; Stevens, K. T.; Foundos, G.; Koselja, M.; Preclikova, J., Characterization of absorption bands in Ti: sapphire crystals. Opt. Mater. Express. 2019, 9, 2216-2251, DOI: 10.1364/OME.9.002216.
[28] Morales, A. E.; Mora, E.S.; Pal, U.; Use of diffuse reflectance spectroscopy for optical characterization of un-supported nanostructures. Revista Mexicana Defisica S. 2007, 53, 18-22.
[29] Sanjay, P.; Chinnasamy, E.; Peepa, K.; Madhavan, J., Senthil, Synthesis, structural, Morphological and optical characterization of TiO2 and Nd3+ doped TiO2 Nano particles by sol-gel method: A comparative study for photovoltaic Applications. Mater. Sci. Eng. 2018, 360, 012011, DOI: 10.1088/1757-899X/360/1/012011.
[30] Saraf, L. V.; Patil, S. I.; Ogale, S. B., Synthesis of nanophase TiO2 by ion beam sputtering and cold condensation technique. Int. J. Mod. Phys. 1998, 12, 2635-2647, DOI: 10.1142/S0217979298001538.
[31] Tsai, M. T.; Lu, F.  H.; Wu, J.M.; Wang, Y. K.; Lin, J. Y., Photoluminescence of Titanium-Doped Zinc Orthosilicate Phosphor Gel Films.  Mater. Sci. Eng. 2011, 18, 032012, DOI: 10.1088/1757-899X/18/3/032012.
[32] Liy, Y.; Zhang, G.; Huang, J.; Tao, X.; Li, G.; Cai, G., Day light white-emitting and abnormal thermal anti-quenching phosphors based on a layered host SrIn2(P2O7)2. Inorg. Chem. 2021, 60, 2279-2293, DOI: 10.1021/acs.inorgchem. Oc03121.
[33] Wang, Y.; Yang, X.; Ma, Q.; Kong, J.; Jia, H.; Wang, Z.; Yu, M., Preparation of fower-like CdS with SDBS as surfactant by hydro-thermal method and its optical properties. Appl. Surf. Sci. 2015, 340, 18-24, DOI: 10.1016/j.apsusc.2015.03.107.
Physical Chemistry Research
Volume 13, Issue 4
Autumn 2025
Pages 755-766

  • Receive Date 13 May 2025
  • Revise Date 22 August 2025
  • Accept Date 14 September 2025