Photoluminescent behavior of BaWO4 powders processed in microwave-hydrothermal

被引：93

作者：

Cavalcante, L. S. ^{[1
]}

Sczancoski, J. C. ^{[1
]}

Espinosa, J. W. M. ^{[1
]}

Varela, J. A. ^{[2
]}

Pizani, P. S. ^{[1
]}

Longo, E. ^{[2
]}

机构：

[1] Univ Fed Sao Carlos, LIEC, Dept Quim & Fis, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Estadual Paulista, IQ, BR-14801907 Araraquara, SP, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 474卷 / 1-2期

关键词：

Optical materials; Precipitation; Crystal structure; Optical properties; Luminescence; BARIUM TUNGSTATE; SPECTRAL PROPERTIES; OPTICAL-PROPERTIES; CRYSTALS; GROWTH; CRYSTALLIZATION; 1ST-PRINCIPLES; SPECTROSCOPY; DIFFRACTION; REFINEMENT;

D O I：

10.1016/j.jallcom.2008.06.049

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：

Photoluminescence (PL) at room temperature was observed in BaWO4 powders processed in microwave-hydrothermal at 140 degrees C for different times. The phases were characterized by X-ray diffraction (XRD) and Fourier transform Raman (FT-Raman) measurements. XRD and FT-Raman analyses revealed that the BaWO4 powders present a tetragonal structure and free of deleterious phases. Ultraviolet-visible absorption spectroscopy was employed to determine the optical band gap of this material. PL measurements at room temperature showed a maximum emission at around 543 nm (green emission) when excited with 488 nm wavelength. PL behavior was attributed to the existence of distortions on the [WO4] tetrahedron groups caused by microwave radiation. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：195 / 200

页数：6

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