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Ignatovych M.,Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine 17 General Naumov Str Kyiv 03164 Ukraine | Borysenko M.,Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine 17 General Naumov Str Kyiv 03164 Ukraine | Davydenko L.,Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine 17 General Naumov Str Kyiv 03164 Ukraine | Borysenko L.,Chuiko Institute Of Surface Chemistry Of Nas Of Ukraine 17 General Naumov Str Kyiv 03164 Ukraine | And 3 more authors.
Materialwissenschaft und Werkstofftechnik | Year: 2016

Quartz glass doped with cerium (0.02-0.36 wt%) and europium (0.01-0.04 wt%) nanoparticles were prepared by a modified sol-gel method. Ultraviolet-visible optical absorption and steady-state photoluminescence excitation-emission techniques were applied for spectral characterization of samples. Absorption spectra for Ce/SiO2 samples showed two intense and broad bands of charge-transfer (CT) character at 240 and 300 nm that were attributed to the O2- → Ce3+ and O2- → Ce4+ transitions, respectively. For Eu/SiO2 and CeEu/SiO2 samples, CT bands O2- → Eu3+ at 225 nm and non-resolved ones O2- → Ce3+ at 245 nm were registered, respectively. Photoluminescence spectra of Ce/SiO2 samples showed the presence of Ce3+ ions emitting in the range of 413-438 nm caused by the 5d-4f transition. Photoluminescence spectra of Eu/SiO2 and CeEu/SiO2 samples featured the characteristic orange-red emission arising from 5D0 → 7Fn manifolds (570-750 nm) of Eu3+ ions. The electric-dipole 5D0 → 7F2 transition at 615 nm dominated in the Eu/SiO2 samples while the magnetic-dipole transition 5D0 → 7F1 at 591 nm dominated in the CeEu/SiO2 double-doped samples. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim February 2016. Source

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