The Bond-Energy Method in Site Occupancy and Property of High Concentration Eu3+ in Sr2CeO4 Phosphors
The low concentration of Eu3+ doped Sr2CeO4 phosphors has been widely studied in recent years and in this paper, we researched the properties of high concentration Eu3+ doped in Sr2CeO4. The Sr2Ce(1−x)Eu4−x/2
(x = 0, 1%, 10%, 20%) phosphors were obtained by traditional solid-state reaction. Photoluminescence (PL) spectra are characterized the property of samples. PL spectra illustrate that the concentration of Eu3+ increased, the intensity of 5D0-7F1,
5D0-7F2 increased and intensity of Sr2CeO4 host emission intensity was decreased. The phenomenon can be ascribed to the energy transfer from Ce4+ to Eu3+. When the concentration of Eu3+ is 20%,
the completely red emission can be obtained even if no other ions are doped under the excitation wavelength of 350 nm, it is proved that Eu3+ occupied Ce sites rather than Sr site in Sr2CeO4 samples. The conclusion we make is due to the value of |ΔE
Eu
Ce−O|
and |ΔE
Eu
Sr−O| calculated by bond-energy method, the smaller the value, the easier it is for the doped ions Eu3+ to enter the site.
Keywords: Bond-Energy Method; Eu3+ Doping; High Concentration; Site Occupancy Preference; Sr2CeO4
Document Type: Research Article
Affiliations: 1: Hubei Collaborative Innovation Center for Advanced Organochemical Materials Ministry-of-Education Key Laboratory for the Synthesis and Applications of Organic Functional Molecules, Hubei University, Wuhan, Hubei, 430062, China 2: Department of Physics, Pukyong National University, Busan 608-737, Korea
Publication date: 01 February 2019
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