کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7840224 | 1505863 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Comparative study of the luminescent properties of oxide compounds under synchrotron radiation excitation: Lu2O3:Eu nanopowders, ceramics and films
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The paper is dedicated to the comparative study of the luminescent properties of Lu2O3:Eu (5%) nanopowders, ceramics and film samples using excitation by the synchrotron radiation in the range of the fundamental absorption edge of Lu2O3 host. The luminescence of F+ centers in the band peaked at 400â¯nm with a lifetime about of 1.4â¯ns was observed in Lu2O3:Eu nanopowder. We have also determined the energy of creation of excitons bound with the F+ centers in Lu2O3 host which is equal to 5.36â¯eV. The notable differences in the luminescence properties of Lu2O3:Eu nanopowder, ceramic and film samples were found which are caused by involvement of the F+ centers at the grain boundaries of ceramics and surface of nanoparticles in the excitation processes of the Eu3+ luminescence in Lu2O3 host. The positions of the high energy levels of the Eu3+ ions in Lu2O3 matrix ware determined in details. We have found also the energy of creation of excitons bound with Eu3+ in the Lu2O3 host which is equal to Eex(Eu)â¯=â¯5.7â¯eV at 8â¯K. Meanwhile, the differences in the Eex(Eu) values in Lu2O3:Eu nanopowders, ceramics and films were also observed to be caused by participation of the host defects and flux impurities in the excitation processes of the Eu3+ luminescence in these samples.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 199, July 2018, Pages 461-464
Journal: Journal of Luminescence - Volume 199, July 2018, Pages 461-464
نویسندگان
T. Zorenko, V. Gorbenko, N. Safronova, N. Matveevskaya, R. Yavetskiy, N. Babayevska, Yu. Zorenko,