Dy3+ doped (K,Na)NbO3-based multifunctional ceramics for achieving enhanced temperature-stable piezoelectricity and non-contact optical temperature sensing performance

Abstract

There exists a huge demand for multifunctional materials to keep pace with the development of the next generation of modern electronics featured with high integration, good reliability and multifunction. Herein, we present a novel Dy³⁺ doped KNN-based lead-free multifunctional fluorescent ferroelectric ceramics. The phase structure, microstructure, electric property and luminescence performance of the Dy³⁺ KNN-based ceramics were systematically investigated. Through modulating diffused phase transition behavior and mediating unit cell distortion via controlling the contents of Dy dopants, an appreciable and thermally stable d₃₃ with a minor variation (345 pC N⁻¹ ± 10%) from 20 to 80 °C was obtained in the ceramics. Besides, a considerable exceeding 550 pm V⁻¹ was also observed. Most intriguingly, the Dy³⁺ modified KNN-based ceramics exhibited efficient luminescence, which could be utilized in non-contact optical low-temperature sensing with a maximum relative sensitivity of 5.49% K⁻¹. Given the good and thermally stable piezoelectricity as well as the unique temperature sensing performance, the Dy³⁺ modified KNN-based ceramics should be a promising material in optoelectronic multifunctional devices.