Comparative study of the luminescent properties of oxide compounds under synchrotron radiation excitation: Lu2O3:Eu nanopowders, ceramics and films
| Autor: | N. Matveevskaya, Vitalii Gorbenko, N.A. Safronova, Nataliya Babayevska, Yu. Zorenko, R.P. Yavetskiy, T. Zorenko |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Exciton Biophysics Analytical chemistry Nanoparticle 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics Ion Absorption edge Impurity visual_art 0103 physical sciences visual_art.visual_art_medium Grain boundary Ceramic 0210 nano-technology Luminescence |
| Zdroj: | Journal of Luminescence. 199:461-464 |
| ISSN: | 0022-2313 |
| Popis: | The paper is dedicated to the comparative study of the luminescent properties of Lu 2 O 3 :Eu (5%) nanopowders, ceramics and film samples using excitation by the synchrotron radiation in the range of the fundamental absorption edge of Lu 2 O 3 host. The luminescence of F + centers in the band peaked at 400 nm with a lifetime about of 1.4 ns was observed in Lu 2 O 3 :Eu nanopowder. We have also determined the energy of creation of excitons bound with the F + centers in Lu 2 O 3 host which is equal to 5.36 eV. The notable differences in the luminescence properties of Lu 2 O 3 :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 Eu 3+ luminescence in Lu 2 O 3 host. The positions of the high energy levels of the Eu 3+ ions in Lu 2 O 3 matrix ware determined in details. We have found also the energy of creation of excitons bound with Eu 3+ in the Lu 2 O 3 host which is equal to E ex (Eu) = 5.7 eV at 8 K. Meanwhile, the differences in the E ex (Eu) values in Lu 2 O 3 :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 Eu 3+ luminescence in these samples. |
| Databáze: | OpenAIRE |
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