Multifunctional BNT-based ferroelectric ceramics with large electrostrain and strong photoluminescence properties

The development of multifunctional materials with optical and electrical properties has become a research hotspot in recent years. In this work, multifunctional 0.935(Bi[Formula: see text]Na[Formula: see text])TiO 3 –0.065BaTiO 3 (BNT–BT)-based ferroelectric ceramics doped with small amounts of CaMAlO 4 ([Formula: see text], Ho) were prepared, and the effect of CaMAlO 4 on the electrostrain and photoluminescence properties of the ceramics was studied. The results showed that the CaMAlO 4 addition weakened the ferroelectric properties of the BNT–BT matrix, and promoted the improvement of the electrostrain performance. For samples doped with 1.5[Formula: see text]mol% CaMAlO 4 , the unipolar strain [Formula: see text] reached the largest values, which were 0.33% ([Formula: see text]) and 0.38% ([Formula: see text]) under an electric field of 70[Formula: see text]kV/cm, corresponding to a large signal [Formula: see text] ([Formula: see text]) of 471[Formula: see text]pm/V ([Formula: see text]) and 543[Formula: see text]pm/V ([Formula: see text]), respectively. In addition, due to the existing Dy[Formula: see text] and Ho[Formula: see text] luminescent ions, the modified samples exhibited excellent photoluminescence performance, which exhibited bright yellow emission ([Formula: see text]) and green emission [Formula: see text] under the blue excitation. Due to their multifunctional features, these materials have potential applications as “on-off” actuators, optical-electro integration and coupling devices.