Abstract
In this work, CaS phosphors were synthesized using the sol–gel method with doping of rare earth metals such as Eu, Dy, and Tm in combination. The optimization of the dopant concentration at 2% allowed for the adjustment of the samples’ characteristics. Detailed analyses were carried out, including X-ray diffraction studies, evaluation of photoluminescence characteristics, examination of hemocompatibility, and determination of the average lifetime of the excited state for this novel set of CaS phosphors. The synthesized phosphors displayed intense greenish-yellow emissions at a wavelength of 543 nm, which can be attributed to the electric dipole transition resulting from the dopants. Among the different compositions, the CaS phosphors doped with 2% Eu and 2% Dy showed exceptional structural and morphological qualities. Additionally, this composition exhibited the highest hemolysis inhibition percentage, with 82.37% of red blood cells remaining viable. Moreover, this particular sample demonstrated the maximum light efficacy in terms of radiation and excitation purity. The study emphasizes the luminescent properties and biocompatibility of the CaS phosphor, particularly when enhanced through doping. The findings suggest promising potential for the application of these phosphors in the field of bioimaging.
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Acknowledgements
The authors gratefully acknowledge The Madura College, Madurai, for their invaluable aid in the research effort, as well as the cooperation of other institutions in sample characterization. One of the authors, D. Sivaganesh, gratefully acknowledges the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Young Scientist Competition Program—2030) for supporting this work. All authors acknowledge the Central Instrumentation Facility, Department of Physics, NMS SVN College, and Madurai for UV and PL, Sophisticated Analytical Instrument Facility (SAIF) for PXRD, University Science Instrumentation Centre, Alagappa University, Karaikudi for AFM, Central Instrumentation Facility, Pondicherry University, Pondicherry for time-resolved fluorescence spectroscopy, and Trichy Research Institute of Biotechnology Pvt.Ltd., Trichy for hemocompatibility test.
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Conceptualization: M. Prema Rani and V. Kavitha; methodology: V. Kavitha; formal analysis and investigation: V. Kavitha and S. Ponsuriyaprakash; writing—original draft preparation: V. Kavitha and D. Sivaganesh; writing—review and editing: V. Kavitha and D. Sivaganesh; supervision: M. Prema Rani.
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Kavitha, V., Rani, M.P., Sivaganesh, D. et al. Synergistic tuning of photoluminescence and biocompatibility in CaS phosphor through dopant combinations of Eu3+, Dy3+, and Tm3+. J Nanopart Res 26, 95 (2024). https://doi.org/10.1007/s11051-024-05987-4
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DOI: https://doi.org/10.1007/s11051-024-05987-4