Luminescence of Eu and Ce in K3Ca2(SO4)3F fluoride material |
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Authors: | Anuradha Poddar S. C. Gedam S. J. Dhoble |
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Affiliation: | 1. Department of Physics, Sindhu Mahavidyalaya, Nagpur, India;2. Department of Physics, K.Z.S. Science College, Nagpur, India;3. Department of Physics, RTM Nagpur University, Nagpur, India |
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Abstract: | A new halophosphor K3Ca2(SO4)3 F activated by Eu or Ce and K3Ca2(SO4)3 F:Ce,Eu co‐doped halosulfate phosphor has been synthesized by the co‐precipitation method and characterized for its photoluminescence (PL). The PL emission spectra of the K3Ca2(SO4)3 F :Ce phosphor show emission at 334 nm when excited at 278 nm due to 5d → 4f transition of Ce3+ ions. In the K3Ca2(SO4)3 F:Eu lattice, Eu2+ (440 nm) as well as Eu3+ (596 nm and 615 nm) emissions have been observed showing 5D0 → 7 F1 and 5D0 → 7 F2 transition of the Eu3+ ion, which is in the blue and red region of the visible spectrum respectively. The trivalent europium ion is very useful for studying the nature of metal coordination in various systems owing to its non‐degenerate emitting 5D0 state. K3Ca2(SO4)3 F:Ce,Eu is suitable for Ce3+ → Eu2+ → Eu3+ energy transfer in which Ce3+and Eu2+ play the role of sensitizers and Eu2+ and Eu3+ act as the activators. The observations presented in this paper are relevant for lamp phosphors. Copyright © 2015 John Wiley & Sons, Ltd. |
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Keywords: | optical materials photoluminescence spectroscopy fluoride lamp phosphor |
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