کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1331854 979020 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of crystal structure and associated electronic structure of Sr6BP5O20
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Investigation of crystal structure and associated electronic structure of Sr6BP5O20
چکیده انگلیسی

Strontium borophosphate phosphate (Sr6BP5O20, SrBP), activated by divalent europium ions is a bluish-green phosphor emitting in a broad band with the emission peak near 480 nm. In this paper, we report the crystal structure of SrBP determined from an analysis of the X-ray diffraction pattern of a prismatic single crystal (size 60 μm×50 μm×40 μm). This crystal was chosen from undoped phosphor powder samples prepared for this purpose by solid-state reaction. SrBP is observed to crystallize in a body-centered tetragonal lattice with the lattice parameters a=9.7895(7)Å and c=19.032(3)Å, the associated space group being I4¯c2 (space group 120). Using the structural data from this study, we have also calculated its electronic structure using the augmented spherical wave method and the local density approximation (LDA). We show the ordering of the electronic states by the density of states (DOS) and the partial DOS plots. The LDA gives a direct optical band gap at the Γ point of about 5 eV. The significance of the crystal structure and associated electronic structure is discussed with respect to maintenance of this phosphor in Hg-discharge lamps.

Crystal structure of Sr6B(PO4)5 determined by single-crystal X-ray diffraction, structure viewed along [1 0 0] direction.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 179, Issue 4, April 2006, Pages 968–973
نویسندگان
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