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Author Wei, T. ♦ Wang, Y. Q. ♦ Zhao, C. Z. ♦ Zhan, L. Q.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ BARIUM COMPOUNDS ♦ CERAMICS ♦ DIELECTRIC PROPERTIES ♦ DOPED MATERIALS ♦ EMISSION SPECTRA ♦ EUROPIUM COMPOUNDS ♦ EUROPIUM IONS ♦ EXCITATION ♦ FERROELECTRIC MATERIALS ♦ LANTHANUM COMPOUNDS ♦ NIOBATES ♦ PHASE TRANSFORMATIONS ♦ PHOTOLUMINESCENCE ♦ POTASSIUM ALLOYS ♦ SODIUM ALLOYS ♦ TEMPERATURE RANGE 0273-0400 K ♦ TITANIUM COMPOUNDS ♦ TUNGSTEN BRONZE ♦ ULTRAVIOLET RADIATION
Abstract Graphical abstract: PL spectra of the unfilled TTB structure BLTN: Eu{sup 3+}x samples (x = 0.00, 0.25, 0.50, 0.75, and 1.00) excited by 399 nm. The inset is a schematic diagram of the unfilled TTB structure. - Highlights: • Unfilled TTB structure BLTN: Eu{sup 3+}x ceramics have been synthesized. • Photoluminescenct properties of the BLTN: Eu{sup 3+}x ceramics have been first reported. • Bright red emission excited by NUV light has been observed at room temperature. • Obvious variations of dielectric characteristics have been confirmed. • Relaxor-like ferroelectric phase transitions have been detected. - Abstract: Unfilled tetragonal tungsten bronze (TTB) structure Ba{sub 4}LaTiNb{sub 9}O{sub 30} doped by Eu{sup 3+} (BLTN: Eu{sup 3+}x) with different x have been prepared, and their structural, photoluminescence, dielectric, and ferroelectric properties are carefully investigated in this work. Bright red emission, originating from {sup 5}D{sub 0} → {sup 7}F{sub 1} and {sup 5}D{sub 0} → {sup 7}F{sub 2} transitions of Eu{sup 3+} ions, has been observed by naked eyes at room temperature under near ultraviolet (NUV) light excitation. Optimized emission intensity is obtained when x = 1.00 for present unfilled TTB-type BLTN: Eu{sup 3+}x samples. Furthermore, with increasing x, the dielectric and ferroelectric characteristics of the unfilled TTB-type BLTN: Eu{sup 3+}x samples also display remarkable variation. When x ≥ 0.50 relaxor-like ferroelectric phase transitions are detected above room temperature, it is believed that unfilled TTB-type BLTN: Eu{sup 3+}x = 1.00 involving bright photoluminescence and enhanced ferroelectric properties may act as a potentially multifunctional optical-electro material.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2014-12-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 60


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