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Shashi Pandey,
Aparna Nadgowda,
Chitra Khade,
Purushottam Naktode,
- Research Scholar, Department of Physics, G H Raisoni University, Amravati, Maharashtra,
- Research Scholar, Department of Physics, G H Raisoni University, Amravati-444701, Maharashtra, India
- Assistant Professor, Department of Physics, G H Raisoni University, Amravati-444701, Maharashtra, India
- Assistant Professor, Department of Physics, G H Raisoni Institute of Engineering and Technology, Nagpur -16, Maharashtra, India
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In this study, we report the successful synthesis of Li3Ba2Gd3(MoO4)8 (RE3+ = Pr3+, Sm3+) phosphors using a novel, microwave-assisted solid-state reaction method at ambient temperature. The synthesis involved the use of analytical grade reagents including Lithium Nitrate (LiNO3), Barium Nitrate, Gadolinium Nitrate (Gd(NO3)3·6H2O), Ammonium Molybdate ((NH4)6Mo7O24·24H2O), and high-purity oxides of Praseodymium (Pr2O3) and Samarium (Sm2O3). The reagents were mixed in stoichiometric ratios, ground thoroughly in a pestle and mortar, and then subjected to microwave irradiation for 10 minutes. The resultant powders were washed, dried, and ground again for further analysis. Under blue light excitation at 450 nm, the Li3Ba2Gd3(MoO4)8:0.07Pr3+ phosphor exhibits a prominent red emission peak at 645 nm. The maximum optical intensity was obtained for 7 mol% doping concentration of both Pr3+ and Sm3+ ions. Pr3+ ions, characterized by their 4f2 electronic configuration, display a broad spectrum of emissions across different wavelengths: red emission from the 1D2 level, green from the 3P0 level, blue from the 1S0 level, and ultraviolet from the 4f to 5d state transition. These multiple emission peaks indicate the versatility of Pr3+ ions in generating various colors under different excitation conditions. Similarly, when excited with near-UV light at 404 nm, the Li3Ba2Gd3(MoO4)8:0.07Sm3+ phosphor demonstrates intense red emission lines at 605 nm. The optimal Sm3+ doping concentration was also determined to be 7 mol%. Sm3+ ions, with their 4f5 electronic configuration, exhibit intense orange-red fluorescence within the visible spectrum. This strong red emission is attributed to transitions from the 4G5/2 excited state to various lower-lying states such as 6H5/2, 6H7/2, and 6H9/2, resulting in the observed sharp emission peaks. Remarkably, the red emission intensities of these phosphors are comparable to that of the conventional Y2O2S3+ red phosphor, which is widely used in commercial applications. This comparison underscores the efficiency and potential of Li3Ba2Gd3(MoO4)8:0.07Pr3+ and Li3Ba2Gd3(MoO4)8:0.07Sm3+ phosphors as high-performance red-emitting materials. These findings highlight the potential of Li3Ba2Gd3(MoO4)8:0.07Pr3+ and Li3Ba2Gd3(MoO4)8:0.07Sm3+ phosphors for integration into near-UV and blue light GaN-based white LEDs. Their superior performance, stability, and compatibility with existing LED technology suggest that these phosphors could serve as promising candidates for next- generation solid-state lighting applications. The successful synthesis and characterization of these phosphors pave the way for further exploration and optimization of rare-earth-doped phosphors in advanced lighting technologies, potentially leading to more efficient and versatile lighting solutions.
Keywords: Luminescent, material, Red, Phosphors, SSM.
Shashi Pandey, Aparna Nadgowda, Chitra Khade, Purushottam Naktode. Microwave-Assisted Synthesis of Li₃Ba₂Gd₃(MoO₄)₈ Phosphors Doped with Pr³⁺ and Sm³⁺ for High-Performance Red Emission in LED Applications. Journal of Polymer and Composites. 2024; ():-.
Shashi Pandey, Aparna Nadgowda, Chitra Khade, Purushottam Naktode. Microwave-Assisted Synthesis of Li₃Ba₂Gd₃(MoO₄)₈ Phosphors Doped with Pr³⁺ and Sm³⁺ for High-Performance Red Emission in LED Applications. Journal of Polymer and Composites. 2024; ():-. Available from: https://journals.stmjournals.com/jopc/article=2024/view=0
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Journal of Polymer and Composites
| Volume | |
| Received | 15/05/2024 |
| Accepted | 15/07/2024 |
| Published | 05/12/2024 |