Abstract
Phase pure monoclinic CaAl2O4 (CA2), CaAl4O7 (CA4) and hexagonal CaAl12O19 (CA12) doped with 1 mol% Ce3+ phosphor were prepared by combustion method at 500 °C in a few minutes. Synthesized phosphor has been well characterized by X-ray diffraction. In the present paper, we discussed the comparative luminescence properties of the phosphors with respect to their crystal structures and the various sites of Ca2+. This paper provides evidence for different coordinated sites of Ca2+ ion in the host used. Comparison between calculated and experimental value of position of energy in the lower d-band edge for Ce3+ ion is discussed. Ce3+ ions were doped in order to study the emission characteristics in the prepared sample with respect to their crystal symmetry. Different emission spectrum is observed despite of their same crystal structure. The photoluminescence emission spectra of the CaAl2O4:Ce, CaAl4O7:Ce, and CaAl12O19:Ce phosphors show strong Ce3+ emission at around 370, 330, and 320 nm for the excitation at 300, 273, and 264 nm wavelengths respectively. The emission characteristics are credited to 5d→4f (2F5/2 and 2F7/2) type transitions in Ce3+.
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Acknowledgments
We are thankful to Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy, Govt. of India, for providing financial assistance under the grant 2013/36/09-BRNS dated 30/05/2013.
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Gedekar, K.A., Wankhede, S.P. & Moharil, S.V. Synthesis and comparative study of Ce3+ ion in calcium aluminates. J Sol-Gel Sci Technol 82, 344–351 (2017). https://doi.org/10.1007/s10971-017-4341-z
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DOI: https://doi.org/10.1007/s10971-017-4341-z