Luminescence and electrical properties of Eu‐modified Bi_0.5Na_0.5TiO₃ multifunctional ceramics

Abstract

The Eu3+‐modified Bi0.5Na0.5TiO3 (BNT) ceramics have been fabricated by the solid‐state reaction method. The impact of Eu3+ doping on the structure, photoluminescence, and electrical properties has been studied by XRD, SEM, PL spectra, and LCR meter. X‐ray diffraction analysis reveals that the crystal structure of the samples is well matched with the trigonal perovskite, and the optimal temperature of presintering is 880°C. The Eu3+‐doped BNT ceramics show excellent red fluorescence at 614 nm corresponding to the 5D0→7F2 transition of Eu3+ under 466 nm excitation and relatively long fluorescence lifetime. The BNT‐0.02Eu ceramic density is up to 5.68 g/cm3 and the relative density is up to 94.6% with sintering temperature 1075°C. The piezoelectric constant (d33) of samples has been significantly improved up to 110 pC/N by Eu3+ doping. The BNT‐0.03Eu ceramic presintered at 880°C and sintered at 1050°C has good dielectric properties and excellent luminescence properties. Eu3+‐doped BNT ceramics make it potential applications for novel integrated electro‐optical and multifunctional devices.

Bifunctional europium doped SrTiO3 ceramics with energy storage and photoluminescence

“…Multifunctional materials are becoming a demand with the rapid development of electronic, optoelectronic, and energy devices [1][2][3]. SrTiO 3 , as an incipient ferroelectric, has always been an essential electronic ceramic material due to its versatile properties, e.g., magnetic, luminescent, and dielectric characteristics via ion doping [4][5][6].…”

“…Increasing the energy density (W) of dielectric capacitors is a major challenge as it is significantly inferior to other energy storage devices such as supercapacitors and batteries. Theoretically there are two methods to increase the W of SrTiO 3 ceramic capacitors: by increasing its ε r or E b , according to 𝑊 = 1 2 𝜀 0 𝜀 𝑟 𝐸 𝑏 2 , where ε 0 is the dielectric constant of vacuum.…”

Analyses of Electric Field-Induced Phase Transformation by Luminescence Study in Eu3+-doped (Na, K)0.5Bi0.5TiO3 Ceramics

“…On one hand, RE ions doped in ferroelectric materials show efficient emissions, while the excellent electrical properties of the ferroelectric materials could be retained or some improved [4,5]. This makes the ferroelectric materials doped with RE ions multifunctional materials [6,7]. For instance, it is reported that electronic-mechanic-optical coupling can be achieved in the BaTiO 3 -CaTiO 3 : Pr materials [8].…”

Quantitative analyses of electric field–induced phase transition in (Na, K)0.5Bi0.5TiO3:Eu ceramics by photoluminescence

“…The rare‐earth (RE) ions–doped ferroelectric ceramics is becoming an interesting field because of the coupling of luminescence and electrical properties . Many ferroelectric ceramics doped with RE ions show efficient PL properties while maintaining their excellent electrical properties, making them multifunctional materials . It is generally believed that the optimal properties of ferroelectric ceramics can be achieved under condition of multiphase coexistence, such as morphotropic phase boundary (MPB) .…”

“…[1][2][3][4] Many ferroelectric ceramics doped with RE ions show efficient PL properties while maintaining their excellent electrical properties, making them multifunctional materials. [5][6][7] It is generally believed that the optimal properties of ferroelectric ceramics can be achieved under condition of multiphase coexistence, 8 such as morphotropic phase boundary (MPB). 9 In ferroelectric materials with compositions near MPB, the free energy difference between phases is small, 10 which means that phase transition can be easily induced by external conditions such as stress and electric field.…”