title: 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.
authors: Key Laboratory of Optoelectronic Material and Device, Department of Physics, Shanghai Normal University , Shanghai 200234, China.
authors: Qirong
authors: Q
authors: Yao
authors: Feifei
authors: F
authors: Wang
authors: Feng
authors: F
authors: Xu
authors: Chung Ming
authors: CM
authors: Leung
authors: Tao
authors: T
authors: Wang
authors: Yanxue
authors: Y
authors: Tang
authors: Xiang
authors: X
authors: Ye
authors: Yiqun
authors: Y
authors: Xie
authors: Dazhi
authors: D
authors: Sun
authors: Wangzhou
authors: W
authors: Shi
keywords: ferroelectric polarization; lead-free; photoluminescence; piezoelectric; strain