Photoluminescence and electrical properties of Er3+-doped Na0.5Bi4.5Ti4O15—Bi4Ti3O12 inter-growth fer
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- 作者：Yalin Jiang ; Xiangping Jiang ; Chao Chen ; Yunjing Chen…
- 关键词：inter ; growth structure ; photoluminescence (PL) ; electrical properties ; multifunctional materials
- 刊名：Frontiers of Materials Science
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：11
- 期：1
- 页码：51-58
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science, general;
- 出版者：Higher Education Press
- ISSN：2095-0268
- 卷排序：11
文摘
Upconversion (UC) and electrical properties of Na0.5Bi8.5-xErxTi7O27 (NBT-BIT-xEr, 0.00⩽x⩽0.25) ceramics were studied. Structural analysis revealed that a single inter-growth structured phase exists in all samples and the Er3+ ion substituting for Bi3+ at the A-site increases the orthorhombic distortion. Under the 980 nm laser excitation, two characteristic green emission bands and one red emission band were situated at 527, 548 and 670 nm, corresponding to the transitions 2H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2, respectively. The optimal photoluminescence (PL) were found in the NBT-BIT-0.20Er sample, and the emission color transforms from green to yellowish green. Temperature dependence of fluorescence intensity ratio (FIR) for NBT-BIT-0.20Er was measured ranging from 290 to 440 K and its maximum sensitivity was calculated to be about 0.0020 K-1 at 290 K. Dielectric measurements indicated that TC slightly increased simultaneously with the decrease of tanδ. Therefore, this ceramic has potential applications for high-temperature multifunctional devices.
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