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Crystals 2019, 9(2), 114;

Different Roles of Ce3+ Optical Centers in Oxyorthosilicate Nanocrystals at X-ray and UV Excitation

Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61072 Kharkiv, Ukraine
Author to whom correspondence should be addressed.
Received: 17 January 2019 / Revised: 6 February 2019 / Accepted: 19 February 2019 / Published: 21 February 2019
(This article belongs to the Special Issue Crystals, Films and Nanocomposite Scintillators)
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Luminescence properties of Lu2SiO5:Ce3+ and Y2SiO5:Ce3+ nanocrystals were studied using photo- and X-ray luminescence techniques. The crystal structure of Re2SiO5 nanocrystals (P21/c space group) differs from the crystal structure of Re2SiO5 bulk crystals (C2/c space group) with 9- and 7-oxygen-coordinated cation positions instead of 6- and 7-coordinated ones observed for Re2SiO5 bulk crystals. Two optical centers (Ce1 and Ce2) were observed for Re2SiO5:Ce3+ nanocrystals originating from cerium ions substituting 9- and 7-oxygen-coordinated cation sites. Preferential substitution of larger cation sites by cerium ions leads to higher photoluminescence intensity of Ce1 centers, however, Ce2 centers are the main centers for electron-hole recombination, so only Ce2 band is observed in X-ray luminescence spectra. The features of oxygen coordination of Ce1 and Ce2 centers and high content of oxygen vacancies in Re2SiO5:Ce3+ nanocrystals can provide preferential trapping of electrons near Ce2 centers, and therefore, the dominant role of Ce2 band in X-ray luminescence spectra. View Full-Text
Keywords: cerium; luminescence; lutetium silicate; yttrium silicate; nanocrystals cerium; luminescence; lutetium silicate; yttrium silicate; nanocrystals

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Seminko, V.; Maksimchuk, P.; Bespalova, I.; Malyukin, Y. Different Roles of Ce3+ Optical Centers in Oxyorthosilicate Nanocrystals at X-ray and UV Excitation. Crystals 2019, 9, 114.

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