Bright Upconversion Emission, Increased Tc, Enhanced Ferroelectric and Piezoelectric Properties in Er-Doped CaBi4Ti4O15 Multifunctional Ferroelectric Oxides
Bright Upconversion Emission, Increased Tc, Enhanced Ferroelectric and Piezoelectric Properties in Er-Doped CaBi4Ti4O15 Multifunctional Ferroelectric Oxides
复制标题
掺铒 CaBi4Ti4O15 多功能铁电氧化物具有明亮的上转换发射、提高的 Tc、增强的铁电和压电性能
DOI：
10.1111/jace.12002
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发表时间：
2013-01-01
影响因子：
3.9
通讯作者：
Sun, Tiantuo
中科院分区：
文献类型：
--
作者：
Peng, Dengfeng;Wang, Xusheng;Sun, Tiantuo
采用固相法合成了掺Er3+的CaBi4Ti4O15(CBT)铋层结构铁电陶瓷。首次系统地研究了薄膜的光致发光、介电、铁电和压电性能。掺Er3+的CBT样品显示出明亮的上转换发光，同时获得了更高的居里温度(TC)，增强了铁电和压电性能。研究了掺Er3+CBT的UC特性与Er3+浓度和入射泵浦功率的关系。在室温激发下(980 Nm)，得到亮绿色(556 Nm)和弱红色(674 Nm)的发射带，分别对应于4S3/2和4F9/2到4I15/2的跃迁。UC发射强度与泵浦功率的关系表明，绿光和红光分别涉及三光子和双光子过程。介电性能研究表明，Er的引入提高了CBT的T_c，且介电损耗值相对较小，从而使其适合于较高温度下的传感器应用。铁电和压电测试结果表明，掺Er3+陶瓷的剩余极化和压电常数均有所增加。掺Er CBT铁电氧化物作为一种多功能材料，在传感器、光电集成、耦合器件等领域显示出巨大的应用潜力。
Er3+-doped CaBi4Ti4O15 (CBT) bismuth layer structured ferroelectric ceramics were synthesized by the solid state method. Photoluminescence (UC), dielectric, ferroelectric, and piezoelectric properties were systematically studied for the first time. The Er3+-doped CBT sample showed a bright up-conversion UC while simultaneously obtaining an increased Curie temperature (Tc), enhanced ferroelectric and piezoelectric properties. The UC properties of Er3+-doped CBT were investigated as a function of Er3+ concentration and incident pump power. A bright green (556nm) and a weak red (674nm) emission bands were obtained under excitation (980nm) at room temperature, which correspond to the transitions from 4S3/2, and 4F9/2 to 4I15/2, respectively. The dependence of UC emission intensity on pumping power indicated that three-photon and two-photon processes are involved in the green and red UC emission, respectively. Studies on dielectric properties indicated that the introduction of Er increased the Tc with relatively smaller values of dielectric loss of CBT, thus making this ceramic suitable for sensor applications at higher temperatures. Ferroelectric and piezoelectric measurements showed that the Er3+-doped ceramics showed an increase in remnant polarization and piezoelectric constant. As a multifunctional material, Er-doped CBT ferroelectric oxide showed great potential in sensor, optical-electro integration, and coupling device applications.