Tunable Emission Phosphor Ca4Y6O(SiO4)6:Ce3+, Eu2+: Luminescence and Energy Transfer |
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Authors: | Panlai Li Zhijun Wang Qinglin Guo Zhiping Yang |
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Affiliation: | Hebei Key Lab of Optic‐electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding, China |
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Abstract: | A series of Ca4–yY6–xO(SiO4)6: xCe3+, yEu2+ samples are synthesized by a high‐temperature solid‐state method. Under 356 nm excitation, Ca4Y6O(SiO4)6:Ce3+ presents a strong blue emission band at 426 nm which are assigned to 4f05d1→4f1 transition of Ce3+ ion. Ca4Y6O(SiO4)6:Eu2+ shows green emission under 380 nm radiation excitation, and the peak locates at 527 nm which is mainly due to transitions of Eu2+ from 4f7 ground state to 4f65d1 excited state. Under 356 nm excitation, a remarkable energy transfer from Ce3+ to Eu2+ exists in Ca4Y6O(SiO4)6, and the result reveals that the mechanism of energy transfer is a resonant type via a nonradiative dipole–dipole interaction. The hues of Ca4Y6O(SiO4)6:Ce3+, Eu2+ can be adjusted by the energy transfer from Ce3+ to Eu2+ ions, and a white emission can be achieved by tuning the ratio of Ce3+ to Eu2+. The results mean that Ce3+ may be the effective sensitizer for Eu2+‐doped Ca4Y6O(SiO4)6. |
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