Structure, upconversion photoluminescence, and dielectric properties of Ho3+- and Yb3+-codoped tetragonal tungsten bronze Sr4La2Ti4Nb6O30

被引：4
|
作者：
Wei, T. [1 ]
Li, C. P. [2 ]
Zhou, Q. J. [1 ]
Li, Z. P. [1 ]
Li, P. [1 ]
Wu, J. [1 ]
Yang, X. F. [1 ]
机构：
[1] Civil Aviat Univ China, Coll Sci, Tianjin 300300, Peoples R China
[2] Tianjin Univ Technol, Tianjin Key Lab Film Elect & Commun Devices, Sch Elect Informat Engn, Tianjin 300384, Peoples R China
来源：
MATERIALS RESEARCH BULLETIN | 2015年 / 64卷
关键词：
Ceramics; Luminescence; Dielectric properties; ENHANCED FERROELECTRIC POLARIZATION; EMISSION; IONS; LUMINESCENCE; YB3+;
D O I：
10.1016/j.materresbull.2014.12.067
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ho3+- and Yb3+-codoped Sr4La2Ti4Nb6O30 (Sr4La1.94-xHo0.06YbxTi4Nb6O30, abbreviated as SLTN: Ho-Ybx) ceramics have been synthesized, and their structural, up-conversion (UC) photoluminescence, and dielectric properties have been carefully investigated. Through Rietveld structural refinement, SLTN: Ho-Ybx samples are determined as single tetragonal tungsten bronze (TTB) phase with space group P4/mbm in which larger Sr2+ ions fill the A(2)-sites, relative smaller La3+, Ho3+, and Yb3+ ions occupy the A(1)-sites, while Ti4+ and Nb4+ ions fill the B-sites. Under 980 nm near infrared (NIR) excitation, bright UC green emission, relatively weak red and near-infrared (NIR) emissions, originating from F-5(4)/S-5(2)-> I-5(8),F-5(5)-> I-5(8), and F-5(4)/S-5(2)-> I-5(7) transitions of Ho3+ ions, are confirmed for SLTN: Ho-Ybx. Two-photon energy transfer process is proved through pumping laser power dependence of emission intensity measurement. Furthermore, the influence of Ho3+- and Yb3+- ions on the dielectric properties of SLTN: Ho-Ybx is also investigated and the temperature stability of dielectric permittivity is improved. (C) 2014 Elsevier Ltd. All rights reserved.
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收藏
页码：395 / 400
页数：6
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