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@prefix dct: <http://purl.org/dc/terms/> .
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              Two different types of structure called X/sub 1/ and X/sub 2/ are existing in Y/sub 2/SiO/sub 5/ at normal conditions. In X/sub 1/ type, Y/sup 3+/ ions occupy two sites where they are surrounded respectively by nine and seven oxygen ions, while in X/sub 2/ structure, only six and seven oxygen ions are involved. Nanometric scale X/sub 1/-Y/sub 2/SiO/sub 5/ crystals were prepared by sol-gel method with particle size around 50 nm. Site selective excitation at low temperature has shown four different luminescent centers. Two of them belong to Eu/sup 3+/ embedded in X/sub 1/-Y/sub 2/SiO/sub 5/, the other two are attributed to Y/sub 2/O/sub 3/:Eu phase and to a particular site on the surface. The occurrence of the latter site may be related to the nanometric size of the sample. A pronounced excitation energy transfer from site 2 to site 1 was also observed on excitation spectra. The energy transfer rate increases rapidly with increasing Eu/sup 3+/ concentration and for x=0.7 in Y/sub 2-x/SiO/sub 5/:Eu/sub x/, no fluorescence takes place in site 2 at 15 K. The lifetimes of the /sup 5/D/sub 0/ levels of Eu/sup 3+/ in the two sites were measured as a function of Eu/sup 3+/ concentration. The results have shown that the lifetime of the /sup 5/D/sub 0/ level of Eu/sup 3+/ in site 2 decreases with increasing Eu/sup 3+/ concentration. The energy transfer rate dependence upon temperature was studied in detail and compared to a theoretical simulation.
            """ ;
    dct:identifier "in2p3-00003967" ;
    dct:issued "2026-06-04T06:17:50.774628"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-06-04T06:17:50.774634"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Site selectively excited luminescence and energy transfer of X$_1$-Y$_2$SiO$_5$:Eu at nanometric scale" ;
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            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-in2p3-00003967v1/resource/b3bc03e4-8071-40f9-92c0-f8c7aac59644> ;
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        "physphysphys-chem-phphysics-physicsphysics-physicschemical-physics-physicschem-ph" ;
    dcat:landingPage <ISSN:%200021-8979> .

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<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-in2p3-00003967v1/resource/b3bc03e4-8071-40f9-92c0-f8c7aac59644> a dcat:Distribution ;
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    dct:issued "2026-06-04T06:17:50.825516"^^xsd:dateTime ;
    dct:modified "2026-06-04T06:17:50.762427"^^xsd:dateTime ;
    dct:title "Site selectively excited luminescence and energy transfer of X$_1$-Y$_2$SiO$_5$:Eu at nanometric scale" ;
    dcat:accessURL <https://in2p3.hal.science/in2p3-00003967> .

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