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The Bond-Energy Method in Site Occupancy and Property of Eu <sup>3+</sup> Doped in SrAl <sub/>2</sub> B <sub/>2</sub> O <sub/>7</sub> Phosphors
摘要： The SrAl2B2O7:1%Eu3+ phosphors were obtained by solid-state reaction. Photoluminescence (PL) spectra are characterized the property of samples, and under the excitation of 394 nm, the sharp emission lines of SrAl2B2O7:1%Eu3+ can be assigned to Judd-Ofelt transitions (5D0–7FJ) of Eu3+, which are 5D0–7F1, 5D0–7F2, 5D0–7F3, and 5D0–7F4. The bond energy method is used to determine the site occupancy, and the occupancy of Eu3+ can be determined by comparing the deviation of its bond energy in different locations at Sr2+, Al3+ and B3+ sites. Theoretical calculation result indicates that Eu3+ would preferentially occupy the smaller energy variation sites Sr2+.
关键词： Eu3+,Site Occupancy Preference,SrAl2B2O7,Bond-Energy Method
更新于2025-09-23 15:22:29
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The Bond-Energy Method in Site Occupancy and Property of High Concentration Eu <sup>3+</sup> in Sr <sub/>2</sub> CeO <sub/>4</sub> Phosphors
摘要： 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.
关键词： Site Occupancy Preference,High Concentration,Eu3+ Doping,Bond-Energy Method,Sr2CeO4
更新于2025-09-19 17:15:36