Abstract
Li+, Na+, or K+ co-doped CaO: Eu3+ phosphors were prepared by the combustion synthesis method and characterized by X-ray diffraction (XRD), photoluminescence and photoluminescence excitation (PL-PLE) spectra. The experimental results show that, upon excitation with 250 nm xenon light, the emission spectrum of the CaO: Eu3+ consists of 4f-4f emission transitions from the 5 D 0 excited level to the 7 F J (J=1, 2, 3) levels with the mainly electric dipole transition 5 D 0→7 F 2 of Eu3+, indicating that the Eu3+ occupies a low symmetry. The charge-transfer band (CTB) shows somewhat red shift with the decreasing ionic radii of co-doped alkali metal ions. The PL and PLE intensities are significantly enhanced, especially the strongest intensity of luminescent is CaO: Eu3+, Li+ phosphor, when alkali metal ions are incorporated. The strongest peak of emission is slightly shifted from 614 to 593 nm, indicating that the Eu3+ ion locates in a symmetric position (O h ) when alkali metal ions are incorporated.
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Funded by the Southwest University of Science and Technology (08zxxp10) and Bureau of Sichun Province (No.2006J13-059)
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Kang, M., Yan, W., Liu, J. et al. Combustion synthesis and luminescent properties of CaO: Eu3+, M+ (M=Li, Na, K) phosphor. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 25, 179–183 (2010). https://doi.org/10.1007/s11595-010-2179-0
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DOI: https://doi.org/10.1007/s11595-010-2179-0