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。
Sm3+ 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 Sm3+dopant concentration, sintering temperature and charge compensation on photolu-minescence properties were systematically investigated. The results showed that the (Bi0.5Na0.5)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 (Bi0.5Na0.5)TiO3-Sm3+samples showed the remarkable im-provement in photoluminescence properties. Hence, the Sm3+ doped (Bi0.5Na0.5)TiO3 ceramics as a multifunctional material may have significantly technological promise for optical-electro integration devices.
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