Sm3+掺杂Na0.5Bi0.5TiO3无铅压电陶瓷的发光性能及热稳定性研究

采用传统的固相烧结法,制备了一系列的Sm^3+掺杂Na0.5Bi0.5TiO3无铅压电陶瓷(NBT∶xSm^3+,0.005≤x≤0.04)。利用X射线衍射仪和荧光分光光度计分别对NBT∶xSm^3+陶瓷样品的物相结构和光致发光性能以及热稳定性进行了分析。结果表明,所有样品均为纯的三方钙钛矿结构。样品的激发光谱在480nm有很强的激发峰,与蓝光LED芯片匹配。发射光谱包含位于563nm、597nm、645nm、709nm处的四个发射峰,分别归属于Sm^3+的4G5/2→6HJ/2(J=5、7、9、11)跃迁,其中发射主峰位于597nm,呈现橙红色发光。当Sm^3+含量为0.02mol时发光性能最佳。当温度范围在30~210℃之间时,NBT∶0.02Sm^3+陶瓷样品的发光性能具有良好的热稳定性.

Luminescence Properties and Thermal Stability of Sm3+-Doped Na0.5Bi0.5TiO3 Lead-Free Piezoelectric Ceramics

A series of Sm^3+doped Na 0.5 Bi 0.5 TiO3 lead-free piezoelectric ceramics(NBT∶xSm^3+,0.005≤x≤0.04)were prepared by the conventional solid-state reaction method.The phase structure and luminescence properties as well as thermal stability of the ceramic samples were characterized using X-ray diffractometer and fluorescence spectrophotometer,respectively.The results show that all NBT∶xSm^3+ceramics exhibit pure rhombohedral perovskite-structure.The excitation spectrum of the sample has a strong excitation peak at 480 nm,which matches well with the blue LED chip.The emission spectra are compose of four emission peaks,which are located at 563 nm,597 nm,645 nm and 709 nm,corresponding to the transitions 4G 5/2→6HJ/2(J=5,7,9,11)of Sm^3+,respectively.Among them,the dominant emission peak is located at 597 nm,presenting orange-red emission.The NBT∶xSm^3+ceramics with x=0.02 mol approaches the optimized photoluminescence.Furthermore,excellent thermal stability of luminous performance for NBT∶0.02Sm^3+solid solution in the temperature range of 30-210℃is obtained.