Abstract
The luminescent properties of Gd2SiO5 powder crystals doped with Eu3+ were investigated using synchrotron radiation and a VUV laser (157.6 nm) as excitationsources. The excitation spectra in the range of 160–330 nm monitoring the red emission fromEu3+ ions reveal bands corresponding to intraconfigurational 4f–4f transitions ofGd3+ and charge transferstates (CTS) of Eu3+–O2−, as well as interbandtransitions of the Gd2SiO5 host, indicating an efficient energy transfer process from the host or directly fromGd3+ toEu3+ ions. The inspection of emission lines from Eu3+ ions suggests that there are three inequivalent sites forEu3+ in this host. The excitation band around 215 nm and the unique emission featuresassociated with this excitation band were attributed to one of the inequivalentEu3+ sites, which exhibits an unusually weak coupling with host lattice. The energy levels ofEu3+ inthe Gd2SiO5 host were tentatively assigned according to the laser excited emission spectra.
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