High Dielectric, Piezoelectric, Upconversion Photoluminescence and Low-Temperature Sensing Properties in Ba0.7Sr0.3TiO3-BaZr0.2Ti0.8O3:Ho/Yb Ceramics

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• 作者：Qianghui Zuo ; Laihui Luo ; Yongjie Yao
• 关键词：Rare earth ; ferroelectric ; upconversion ; temperature sensor
• 刊名：Journal of Electronic Materials
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：45
• 期：2
• 页码：970-975
• 全文大小：1,381 KB
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• 作者单位：Qianghui Zuo (1)
  Laihui Luo (1)
  Yongjie Yao (1)
  
  1. Department of Microelectronic Science and Engineering, Ningbo University, Ningbo, 315211, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Boston
• ISSN：1543-186X

文摘

In the present work, we have synthesized pure and Ho/Yb-co-doped 0.5Ba_0.7Sr_0.3TiO₃-0.5BaZr_0.2Ti_0.8O₃ ceramics using a solid-state reaction technique. The prepared pure 0.5Ba_0.7Sr_0.3TiO₃-0.5BaZr_0.2Ti_0.8O₃ ceramics were found in the morphotropic phase boundary region, and exhibit high piezoelectric and dielectric properties. Under a 980-nm excitation, strong green, red and near-infrared (NIR) upconversion (UC) photoluminescence is observed in Ho/Yb-co-doped samples. It is found that the color of UC emission could be tuned by changing the concentration of sensitizer Yb ions in the host matrix. Furthermore, optical temperature sensing properties based on the green and NIR UC emissions of BSZT:0.005Ho/0.01Yb were investigated. Fluorescence intensity ratio (FIR) between green (5F₄,5S₂) → ^{5I₈ and NIR (5F₄,5S₂) → 5I₇ UC emissions of Ho ions was studied as a function of temperature in the range of 78 K–373 K, and a maximum sensitivity 0.0206 K−1 at 97 K was obtained. Keywords Rare earth ferroelectric upconversion temperature sensor}