Intense blue and green photoluminescence emissions at room temperature in barium zirconate powders

被引：70
作者：
Cavalcante, L. S. [1 ,2 ]
Sczancoski, J. C. [1 ]
Espinosa, J. W. M. [1 ,2 ]
Mastelaro, V. R. [3 ]
Michalowicz, A. [4 ]
Pizani, P. S. [1 ]
De Vicente, F. S. [3 ]
Li, M. S. [3 ]
Varela, J. A. [2 ]
Longo, E. [2 ]
机构：
[1] Univ Fed Sao Carlos, Dept Quim & Fis, BR-13565905 Sao Carlos, SP, Brazil
[2] UNESP, Inst Quim, BR-14801907 Araraquara, SP, Brazil
[3] USP, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
[4] Univ Paris 12, Fac Sci & Technol, F-94010 Creteil, France
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 471卷 / 1-2期
关键词：
Disordered systems; Clusters; Chemical synthesis; Order-disorder effects; EXAFS; TRANSFER VIBRONIC EXCITONS; NEAR-EDGE STRUCTURE; THIN-FILMS; ABO(3) PEROVSKITES; STRONTIUM-TITANATE; SINGLE-CRYSTAL; LUMINESCENCE; BAZRO3; SRTIO3; BATIO3;
D O I：
10.1016/j.jallcom.2008.03.080
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Intense blue and green photoluminescence (PL) emissions were observed at room temperature in barium zirconate (BaZrO3) powders prepared by chemical method. The powders were analyzed by X-ray diffraction (XRD), X-ray absorption near edge spectroscopy (XANES), extended X-ray absorption spectroscopy (EXAFS) and ultraviolet-visible (UV-vis) absorption spectroscopy. The XRD patterns indicated the presence of a secondary phase of BaCO3 in BaZrO3 powders heat treated at 773K. K-edge XANES data revealed that Zr atoms presents in at least two Zr environments. EXAFS investigations showed strong bond length dispersion in the first coordination shell around Zr atoms. EXAFS analysis indicated that Zr atoms are coordinated by 6 oxygen in BaZrO3 powders heat treated at 973 K. UV-vis measurements suggested the presence of intermediary energy levels into the band gap of BaZrO3 powders heat treated at 773K. The intense PL emission in BaZrO3 powders can be attributed to the two Zr environments or ZrO5-ZrO6 clusters. (C) 2008 Elsevier B.V. All rights reserved.
引用
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页码：253 / 258
页数：6
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