Abstract
In this work, (Na,Bi)0.5-x(K,Er)xBi4Ti4O15 (NBT-xK/Er) multifunctional ceramics with a strong green upconversion emission were prepared. The structural and electrical/luminescence properties of the ceramics were studied. Dense microstructures with single bismuth-oxide layered phase structure formed in the NBT-xK/Er samples. After K/Er doping, the samples showed good electrical properties while simultaneously obtaining a bright upconversion green photoluminescence under excitation at 980 nm. The emission intensity is related to doping concentration. At x = 0.008, the maximum emission intensity was achieved. Meanwhile, a good electrical performance (piezoelectric constant: ~22 pC/N, remnant polarization: ~16.4 μC/cm2, and Curie temperature: ~626 °C) was simultaneously achieved. The samples showed good temperature stability, which make them appropriate candidates for high-temperature piezoelectric applications. The results indicate that the prepared materials feature market potential and application foreground in new multifunctional devices.
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