(Bi0.5Na0.5)TiO3:Sm3+无铅压电陶瓷的红光发射特性

采用传统的固相反应烧结方法制备了稀土Sm³⁺掺杂的(Bi_0.5Na_0.5)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(Bi_0.5Na_0.5)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(Bi_0.5Na_0.5)TiO₃材料在光电集成器件中具有很好的应用前景。

Red Emission Properties for (Bi0.5Na0.5)TiO3:Sm3+ Lead-free Piezoelectrics

Sm³⁺ doped (Bi_0.5Na_0.5)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 Sm³⁺ dopant concentration, sintering temperature and charge compensation on photoluminescence properties were systematically investigated. The results showed that the (Bi_0.5Na_0.5)TiO₃ ceramics realized red-green emission by additives of Sm³⁺ 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 Sm³⁺ ions, indicating that host activator energy transfer of Sm³⁺ could be responsible for this enhancement. Among the compensators of Li⁺, Na⁺ and K⁺ ions, the K⁺ compensated (Bi_0.5Na_0.5)TiO₃-Sm³⁺ samples showed the remarkable improvement in photoluminescence properties. Hence, the Sm³⁺ doped (Bi_0.5Na_0.5)TiO₃ ceramics as a multifunctional material may have significantly technological promise for optical-electro integration devices.