Distinct structural and optical correlations of Y1-xEuxOF and Yn(1-x)EUnxOn-1Fn+2 (x=0.001-0.1, n=6, 7) vernier phosphors

作者：Park Sangmoon^*

来源：Journal of Luminescence, 2015, 166: 176-179.

DOI：10.1016/j.jlumin.2015.05.044

• Photoluminescence
• X-ray diffraction patterns
• Vernier
• Eu3+ transitions
• Phosphors

Eu3+ substituted YOF and vernier-phase YnOn-1Fn+2 (n=6, 7) phosphors, which are rhombohedral and orthorhombic structures, respectively, were prepared using a flux-assisted reaction at different temperatures. Stoichiometric and nonstoichiometric yttrium oxyfluoride phases were identified by examination of the indexed peak positions in the X-ray diffraction patterns of the resultant phosphors; however, Y6O5F8 and Y7O6F8 lattice structures in vernier phases were indistinguishable by this method. To identify the vernier phases, the photoluminescence excitation and emission spectra peaks assigned to charge-transfer bands and f-f transitions of Eu3+ ions in YnOn-1Fn+2 host with the YOF were monitored. The YnOn-1Fn+2 vernier phases were indicated by the O2-(F-)-Eu3+ charge-transfer bands and the site symmetry of Eu3+ emission assigned by D-3(0)-> F-7(1), F-7(2) transitions, and were classified as centrosymmetric Y6O5F8 and noncentrosymmetic Y2O6F8 structures. The critical distances (R-c) in both Y1-xEuxOF and Y6(1-x)Eu6xO5F8 (X=0.001-0.1) lattice structures were calculated by observation of quenching of the relative intensity in the Eu3+ activated red emission.

• 出版日期2015-10