Enhanced electrical properties and strong red light‐emitting in Eu 3+ ‐doped Sr 1.90 Ca 0.15 Na 0.9 Nb 5 O 15 ceramics

The luminescent‐ferroelectic materials based on Sr 1.90 Ca 0.15 Na 0.9 Nb 5 O 15 ( SCNN ) matrix doping with Eu 3+ were synthesized by the conventional solid‐state reaction method. The crystal structure, photoluminescence, thermal stability, dielectric, ferroelectric, and piezoelectric behaviors were systematically investigated. XRD results revealed that Eu 3+ introduction could induce the tungsten bronze phase transition from orthorhombic to tetragonal structures. The dielectric spectra of all specimens showed two broad dielectric anomalies: a high‐temperature ferroelectric phase transition ( T c ) and a low‐temperature ferroelastic phase transition ( T s ), both of which were suppressed at higher Eu 3+ concentrations. The enhanced electrical properties were obtained in a proper Eu 3+ concentration range of 0.03‐0.05. For all SCNN : x E u 3+ samples, the strong red emission peak at 617 nm originating from the electric dipole transition of 5 D 0 → 7 F 2 was excited by different light excitations of 395 or 463 nm. Our results demonstrated that Eu 3+ ‐doped SCNN materials might have promising potential in advanced multifunctional optoelectronic applications.