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Synthesis and study of structure and optical properties of RE3+(RE = Sm3+ and Tb3+) activated Ca8NaBi(PO4)6F2 orange-red and green emitting phosphors prepared by Pechini method

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Abstract

In this paper, we report that Ca8NaBi(PO4)6F2 fluorapatites doped with (RE3+ = Sm3+ and Tb3+) ions synthesised by the modified Pechini method are promising candidates for orange-red and green-emitting materials for optical applications. The characterization of this synthesized sample was done, and XRD and Rietveld refinement analysis confirm that it crystallised into a hexagonal structure. By analysing the emission of activators, it is shown that RE3+ substitutes for the Bi3+ ones in the host lattice and is put up in two different sites (M1 and M2). Photoluminescence (PL) analysis shows that Ca8NaBi(PO4)6F2: Sm3+, Tb3+, show highly intense peaks at 600 nm (4G5/2 to 6H5/2), and 544 nm (5D4 to 7F5) under the excitation of 402 nm and 350 nm, respectively. Ca8NaBi(PO4)6F2:Sm,Tb apatite has high available doping concentrations with moderate concentration quenching of luminescence (up to 8 mol% for Sm3+ and 7 mol% for Tb3+, as shown in the present work); also, this phosphor has relatively long lifetimes of the (4G5/2) Sm3+ level and (5D4) Tb3+ (1.91 ms and 2.21 ms, respectively). The above sample was successfully prepared by the environmentally friendly synthesis technique by the modified Pechini method at low temperatures (at 900 °C). The analysis of the optical characteristics of the Ca8NaBi(PO4)6F2:Sm3+ and Tb3+ phosphors indicates that these materials are promising candidates for applications as orange-red and green-emitting phosphors, with the combination of blue phosphors for warm white light-emitting diode applications.

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All data supporting the study’s conclusions are contained in the manuscript, and all data will be made available on request.

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Acknowledgements

One of the author BPB is thankful to MAHAJYOTI Fellowship for financial support for this research work. For SEM and EDS, we gratefully acknowledge VNIT Nagpur.

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Author declared that this work was supported by Mahajyoti fellowship for financial assistance.

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Authors and Affiliations

  1. Department of Physics, Anand Niketan College, Anandwan, Warora, Dist. Chandrapur, 442914, India

    Bharti Bawanthade, Ashok Mistry & Nilesh Ugemuge

  2. Department of Physics, R.T.M. Nagpur University, Nagpur, 440033, India

    S. J. Dhoble

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  1. Bharti Bawanthade
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  2. Ashok Mistry
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  4. S. J. Dhoble
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All authors contributed to the study’s conception and design. Material preparation, data collection, analysis, and the first draught of the manuscript were performed by Bharti Purushottam Bawanthade; review and editing were done by Ashok Abani Mistry, and Nilesh Ugemuge edited the manuscript. S. J. Dhoble done final review and editing of this manuscript. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Bharti Bawanthade.

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Bawanthade, B., Mistry, A., Ugemuge, N. et al. Synthesis and study of structure and optical properties of RE3+(RE = Sm3+ and Tb3+) activated Ca8NaBi(PO4)6F2 orange-red and green emitting phosphors prepared by Pechini method. J Mater Sci: Mater Electron 35, 355 (2024). https://doi.org/10.1007/s10854-024-12093-7

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