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2005
Luminescence
D 6540
Synthesis, Thermal Evolution, and Luminescence Properties of Yttrium Disilicate
Matrix. — The Y-, α-, β-, and γ-phases of Y2Si 2O7 are synthesized by calcination
25- 007 Host
of an amorphous precursor at different temperatures between 1200 and 1600 °C. The
precursor is precipitated from solutions of Si(OEt)4 in EtOH and Y(NO3)3 in H2O by
addition of NH3 (80 °C, 6 h). The samples are characterized by DTA, XRD, TEM, and
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Si MAS NMR and IR spectroscopy. The luminescence properties of different polymorphs of Dy-doped Y2Si 2O7 are characterized by fluorescence measurements at room
temperature. The β-phase doped with 2.5 at% Dy has the maximum emission efficiency, approximately 40% of that measured for the commercial Y2O3:Eu phosphor, and is
an excellent candidate for optical applications. — (DIAZ, M.; PECHARROMAN, C.;
DEL MONTE, F.; SANZ, J.; IGLESIAS*, J. E.; MOYA, J. S.; YAMAGATA, C.;
MELLO-CASTANHO, S.; Chem. Mater. 17 (2005) 7, 1774-1782; Inst. Cienc. Mater.,
CSIC, Univ. Auton., Cantoblanco, E-28049 Madrid, Spain; Eng.) — W. Pewestorf
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