Electric Field-Induced Giant Strain and Photoluminescence-Enhancement Effect in Rare-Earth Modified Lead-Free Piezoelectric Ceramics

Abstract

In this work, an electric field-induced giant strain response and excellent photoluminescence-enhancement effect was obtained in a rare-earth ion modified lead-free piezoelectric system. Pr(3+)-modified 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3 ceramics were designed and fabricated by a conventional fabrication process. The ferroelectric, dielectric, piezoelectric, and photoluminescence performances were systematically studied, and a schematic phase diagram was constructed. It was found the Pr(3+) substitution induced a transition from ferroelectric a long-range order structure to a relaxor pseudocubic phase with short-range coherence structure. Around a critical composition of 0.8 mol % Pr(3+), a giant reversible strain of ∼0.43% with a normalized strain Smax/Emax of up to 770 pm/V was obtained at ∼5 kV/mm. Furthermore, the in situ electric field enhanced the photoluminescence intensity by ∼40% in the proposed system. These findings have great potential for actuator and multifunctional device applications, which may also open up a range of new applications.

Reversible luminescence modulation of Ho‐doped K0.5Na0.5NbO3 piezoelectrics with high luminescence contrast

“…For example, Jia et al reported dual‐enhancement between the ferro‐/piezoelectric polarization and the photoluminescent performance of rare earth Pr 3+ ‐doped (K 0.5 Na 0.5 )NbO 3 (KNN) lead‐free ceramics, and observed the polarization‐induced luminescent enhancement . Similar behavior is also observed in Er/Yb co‐doped 0.94(K 0.5 Na 0.5 )NbO 3 –0.06LiNbO 3 or Pr 3+ ‐modified 0.93(Bi 0.5 Na 0.5 )TiO 3 –0.07BaTiO 3 ceramics . Up to now, Ln‐doped KNN‐based materials have drawn many researchersʼattentions, the focus of attention is to realize the coexistence of ferro‐/piezoelectric and luminescent properties, and investigate the relationship between them.…”

Physical Manipulation of Lanthanide‐Activated Photoluminescence

“…This design enables dynamic and reversible tuning of the upconversion luminescence of Er 3+ through manipulating the electric field. When applying external electric field to Pr 3+ -doped ferroelectric ceramic with similar composition and structure of BaTiO 3 , [92][93][94][95] either in a real-time manner or through polarization, the luminescence intensity of Pr 3+ could be improved with a maximum record of 40%. [89] Electric field-induced Er 3+ upconversion enhancement was also studied in ferroelectric glass ceramics.…”

The upconversion luminescence modulation and its enhancement in Er3+‐doped Na0.5Bi0.5TiO3 based on photochromic reaction

“…Recently, it is widely reported that luminescence emission of RE‐doped ferroelectrics can be modulated by altering the crystalline symmetry via an in situ external electric field or electric field poling since the ferroelectrics have a peculiar piezoelectric response. The photoluminescence of Yb 3+ /Er 3+ ‐codoped BaTiO 3 thin films and Pr 3+ ‐modified 0.93NBT‐0.07BaTiO 3 ceramics is tuned by an in situ electric field . The luminescence intensity of Eu 3+ ‐doped 0.94NBT‐0.06BaTiO 3 and Pr 3+ ‐doped Ba 0.85 Ca 0.15 Ti 0.90 Zr 0.10 O 3 ferroelectrics is enhanced by application of an electric field .…”