Abstract
Nanocrystalline green-emitting Tb3+-doped Y3Al5O12 (garnet) nanophosphors were synthesized via an efficient and economical solution combustion route using hexamethylenetetramine (C6H12N4) as a fuel. The samples were synthesized at 500 °C and calcined at 650, 950 and 1050 °C for further analysis. The structural and lattice parameters for both undoped and Tb3+-doped Y3Al5O12 materials were determined by Rietveld refinement using diffraction data. The pure crystalline phase of YAG:Tb3+ having a cubic unit cell with Ia\( \overline{{3\text{d}}} \) space group was obtained at 500 °C without the presence of intermediate phases like YAlO3 and Y4Al2O9. FTIR analysis proposed the presence of different bands corresponding to AlO4 tetrahedra and AlO6 octahedra supporting the XRD measurements. The synthesis of nanocrystalline materials with slightly agglomerated particles with narrow size distribution was confirmed by transmission electron microscope (TEM). Energy dispersive X-ray (EDX) examination confirmed the synthesis of desired samples with the existence of components coordinated inside the crystalline host. The phosphors yielded bright emission in the green region owing to the 5D4 → 7F5 (544 nm) transition at λex = 267 nm. Critical distance affirmed that the transfer of energy happens by means of the multipolar association phenomenon. The down-conversion and structural investigations support the convenient utility of Y3Al5O12:Tb3+ materials in solid-state lighting and other optoelectronic devices.
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Acknowledgements
Sitender Singh would be appreciative to Council of Scientific & Industrial Research, New Delhi, India for the financial help furnished as senior research fellowship having Authorization No. [09/382(0194)/2017-EMR-I].
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Singh, S., Singh, D. Down-conversion and structural characterizations of trivalent terbium-doped garnet nanocrystalline phosphors for lighting applications. J Mater Sci: Mater Electron 32, 17674–17685 (2021). https://doi.org/10.1007/s10854-021-06303-9
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DOI: https://doi.org/10.1007/s10854-021-06303-9