Electrical properties and luminescence properties of 0.96(K0.48Na0.52)(Nb0.95Sb0.05)-0.04Bi0.5(Na0.82K0.18)0.5ZrO3-xSm lead-free ceramics

In this paper, Sm-doped 0.96(K0.48Na0.52)(Nb0.95Sb0.05)-0.04Bi(0.5)(Na0.82K0.18)(0.5)ZrO3 (abbreviated as KNSN-0.04BNKZ) lead-free piezoelectric ceramics were prepared by conventional solid-state sintering method and the effects of Sm2O3 on the phase structure, microstructure, electrical and luminescent properties of KNSN-0.04BNKZ potteries were studied. Results revealed that a single solid solution phase with pseudo-cubic perovskite structure was formed between KNSN-0.04BNKZ and Sm2O3. Existence of weak dielectric/ferroelectric properties with a diffuse dielectric anomaly and slim P-E hysteresis loops of the Sm-doped KNSN-0.04BNKZ demonstrated the ferroelectric relaxor behavior of the KNNS-0.04BNKZ-xSm ceramics. Accordingly, the temperature stability and fatigue behavior of the modified ceramics were significantly improved. It was found that the KNSN-0.04BNKZ ceramics with 0.002 mol Sm addition exhibited nearly temperature independent properties and fatigue-free behavior. Moreover, Sm-modified KNSN-0.04BNKZ exhibits a bright photoluminescence with a strong orange emission under visible light irradiation. As a material with both electrical and luminescent properties, it has good application prospect in future optoelectronic components by integrating its luminescent and electrical properties.