Photoluminescence and electrical characterization of unfilled tetragonal tungsten bronze Ba4La1 − xEuxTiNb9O30

Unfilled tetragonal tungsten bronze (TTB) structure Ba 4 LaTiNb 9 O 30 doped by Eu 3+ (BLTN: Eu 3+ x ) with different x have been prepared, and their structural, photoluminescence, dielectric, and ferroelectric properties are carefully investigated in this work. Bright red emission, originating from 5 D 0   →   7 F 1 and 5 D 0   →   7 F 2 transitions of Eu 3+ ions, has been observed by naked eyes at room temperature under near ultraviolet (NUV) light excitation. Optimized emission intensity is obtained when x   =   1.00 for present unfilled TTB-type BLTN: Eu 3+ x samples. Furthermore, with increasing x , the dielectric and ferroelectric characteristics of the unfilled TTB-type BLTN: Eu 3+ x samples also display remarkable variation. When x   ≥   0.50 relaxor-like ferroelectric phase transitions are detected above room temperature, it is believed that unfilled TTB-type BLTN: Eu 3+ x   =   1.00 involving bright photoluminescence and enhanced ferroelectric properties may act as a potentially multifunctional optical-electro material.