کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5397514 1505871 2017 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dipole - dipole and dipole - quadrupole interactions between Sm3+ ions in K4BaSi3O9
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Dipole - dipole and dipole - quadrupole interactions between Sm3+ ions in K4BaSi3O9
چکیده انگلیسی
K4BaSi3O9 (KBSO) doped with Sm3+ was synthesized for the first time by conventional solid-state method. Results of XRD measurements confirm that the obtained powder is K4BaSi3O9 single phase. The new material exhibits red luminescence with maximum at 641 nm under 407 nm excitation. At 300 K the luminescence intensity is quenched for Sm3+ concentration above 0.5%. The decay profiles revealed the non-radiative energy transfer between the Sm3+ ions. The interaction has dipole - dipole character for low Sm3+ concentrations (up to 1%) then dipole - quadrupole for higher dopant concentration (over 1%). The critical distances are 8.8 Å and 9.5 Å for dipole - dipole and the latter interactions, respectively. This phenomenon is explained by analyzing the probability of occupation of all possible sites available for Sm3+ in KBSO taking into account local charge compensation. The site occupation preference by Sm3+ ions depends on the distances between available cation sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 190, October 2017, Pages 123-127
نویسندگان
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