(Bi_(0.5)Na_(0.5))TiO_3:Sm^(3+)无铅压电陶瓷的红光发射特性  

Red Emission Properties for(Bi_(0.5)Na_(0.5))TiO_3:Sm^(3+) Lead-free Piezoelectrics

作　　者：孙海勤[1,2] 张涛[1] 张奇伟[1,2] 张胤[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010 [2]同济大学功能材料研究所,上海200092

出　　处：《无机材料学报》2014年第8期851-854,共4页Journal of Inorganic Materials

基　　金：内蒙古科技大学创新基金(2012NCL006;2012NCL002);中国博士后科学基金(2013M540384)~~

摘　　要：采用传统的固相反应烧结方法制备了稀土Sm3+掺杂的(Bi0.5Na0.5)TiO3无铅压电陶瓷。系统分析了掺杂浓度、烧结温度和离子补偿对发光特性的影响。稀土Sm3+离子的加入实现了(Bi0.5Na0.5)TiO3陶瓷的红绿光发射,其激发光波段位于400~500 nm范围内,与已经成熟的蓝光LED芯片的发射光谱充分匹配。当烧结温度为1100℃,Sm3+离子的掺杂浓度为0.015 mol时,陶瓷样品呈现最强的发光强度。同时,通过Li+、Na+、K+离子进行电荷补偿,有效提高了陶瓷样品的发光性能,发光强度随离子半径增大而增强。可见,Sm3+掺杂的(Bi0.5Na0.5)TiO3材料在光电集成器件中具有很好的应用前景。Sm^3＋ doped（Bi0.5Na0.5）TiO3 lead-free piezoelectric ceramics were fabricated by the conventional solid-state reaction method. Phase and crystallinity of the synthesized materials were investigated by X-ray diffraction（XRD）. The influences of the Sm^3＋ dopant concentration, sintering temperature and charge compensation on photoluminescence properties were systematically investigated. The results showed that the（Bi0.5Na0.5）TiO3 ceramics realized red-green emission by additives of Sm^3＋ ions, and the excitation bands were well adaptable to the emission band of commercial blue light-emitting diodes. The emission intensities were strongly dependent on the dopant concentration and sintering temperature with the optimal value at 0.015 mol and 1100℃, respectively. The enhanced luminescence was observed for the Li＋, Na＋ and K＋ doped compositions as compensators compared to the host matrix with only Sm^3＋ions, indicating that host activator energy transfer of Sm^3＋ could be responsible for this enhancement. Among the compensators of Li^＋, Na^＋ and K^＋ ions, the K^＋ compensated（Bi0.5Na0.5）TiO3-Sm^3＋ samples showed the remarkable improvement in photoluminescence properties. Hence, the Sm^3＋ doped（Bi0.5Na0.5）TiO3 ceramics as a multifunctional material may have significantly technological promise for optical-electro integration devices.

关 键 词：无铅压电陶瓷 蓝光LED 多功能材料 

分 类 号：TQ174[化学工程—陶瓷工业]