Optical properties of Eu2+/Eu3+ mixed valence phosphor Ca2SiO2F2:Eu2+/Eu3+ |
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Authors: | Mubiao Xie Guoxian Zhu Rongkai Pan Wei Xie |
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Affiliation: | 1. Institute of Physical Chemistry, School of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang, China;2. School of Physics Science and Technology, Lingnan Normal University, Zhanjiang, China |
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Abstract: | The Eu2+/Eu3+ mixed valence phosphor Ca2SiO2F2:Eu2+/Eu3+ was prepared using a solid‐state reaction synthesis method in a CO atmosphere, and the optical properties were investigated. The spectroscopic properties revealed that Ca2+ ions were occupied by both Eu2+ and Eu3+ ions in Ca2SiO2F2, and both ions were able to generate their characteristic emissions. A broad 5d → 4f Eu2+ band at ~470 nm and narrow 4f → 4f Eu3+ peaks upon excitation with n‐UV light were observed. The ratio between Eu2+ and Eu3+ emissions changed regularly, and the relative intensity of the red component from Eu3+ became systematically stronger with increasing overall Eu content. As a result, the emission color of these phosphors can be tunable from blue to pink under n‐UV light excitation. |
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Keywords: | phosphors mixed valence tunable emission |
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