Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation

被引:85
作者
Gracia, Lourdes [1 ]
Longo, Valeria M. [2 ]
Cavalcante, Laecio S. [2 ]
Beltran, Armando [1 ]
Avansi, Waldir [3 ]
Li, Maximo S. [3 ]
Mastelaro, Valmor R. [3 ]
Varela, Jose A. [2 ]
Longo, Elson [2 ]
Andres, Juan [1 ]
机构
[1] Univ Jaume 1, Dept Quim Fis & Analit, MALTA Consolider Team, E-12080 Castellon de La Plana, Spain
[2] Univ Estadual Paulista, Inst Quim, LIEC, BR-14800900 Araraquara, SP, Brazil
[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
LIGHT PHOTOLUMINESCENCE EMISSION; THIN-FILMS; SOLVOTHERMAL SYNTHESIS; LUMINESCENT PROPERTIES; MICROWAVE SYNTHESIS; METAL TUNGSTATES; INORGANIC SOLIDS; ROOM-TEMPERATURE; LEAD TUNGSTATE; CA;
D O I
10.1063/1.3615948
中图分类号
O59 [应用物理学];
学科分类号
摘要
By combining experimental techniques such as x-ray diffraction, Fourier transform Raman, ultraviolet-visible, x-ray absorption near edge structure, extended x-ray absorption fine structure spectroscopy, and theoretical models, a general approach to understand the relationship among photoluminescence (PL) emissions and excited electronic states in CaWO4 crystals is presented. First-principles calculations of model systems point out that the presence of stable electronic excited states (singlet) allow us to propose one specific way in which PL behavior can be achieved. In light of this result, we reexamine prior experiments on PL emissions of CaWO4. (C) 2011 American Institute of Physics. [doi:10.1063/1.3615948]
引用
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页数:11
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