کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1332854 979058 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Luminescence of NaGdFPO4:Ln3+ after VUV excitation: A comparison with GdPO4:Ln3+ (Ln=Ce, Tb)
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Luminescence of NaGdFPO4:Ln3+ after VUV excitation: A comparison with GdPO4:Ln3+ (Ln=Ce, Tb)
چکیده انگلیسی

The phosphors NaGdFPO4:Ln3+ and GdPO4:Ln3+ (for Ln3+=Ce3+ and Tb3+) were prepared by solid-state reaction technique, the VUV–vis spectroscopic properties of the phosphors were investigated, and we vividly compare the luminescence of Ce3+ and Tb3+ in the hosts. For phosphors GdPO4:Ln3+, the band near 155 nm in VUV excitation spectrum is assumed to be the host-related absorption, and for NaGdFPO4:Ln3+ the absorption is moved to longer wavelength, near 170 nm, showing the P–O bond covalency increased after fluoridation. The f–d transitions of Ce3+ and Tb3+ in the host lattices are assigned and corroborated, and it was found that the 5d states are with lower energy in NaGdFPO4:Ln3+ than those in GdPO4:Ln3+. For fluoridation of GdPO4:Ln3+ to NaGdFPO4:Ln3+, the energy change of Ln3+ (Ln=Ce, Tb) 5d states is consistent with that of host-related absorption.

The VUV excitation (a, under emission at 312 nm) and VUV-excited emission (b, excitation under 155 nm) spectra for phosphor GdPO4 at 293 K, the VUV excitation (c, under emission at 311 nm) and VUV-excited emission (d, excitation under 166 nm) spectra for phosphor NaGdFPO4 at 293 K.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 179, Issue 5, May 2006, Pages 1356–1362
نویسندگان
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