Photoluminescence and optical temperature sensing properties of Dy-doped NaBiTiO multifunctional ferroelectric ceramics.

A series of Dy doped NaBiTiO (NBT: xDy, x = 0.003-0.018) lead-free ferroelectric ceramics were successfully prepared by a solid-state reaction method. The Dy ions composition dependent photoluminescence properties were systematically studied. All the samples display intense characteristic emission of Dy under an excitation wavelength of 454 nm, which are attributed to the transitions of F → H (J = 13, 11 and 9). All the samples show strong orange-yellow emission, which could be applied to warm white light hopefully. When the content of Dy is equal to 0.012, the ceramic has the optimal luminous performance. Remarkable thermal quenching of the luminous intensity ceramic occurs as the temperature is higher than initial temperature 293 K. Furthermore, Dy activated photoluminescence performance combined with the presence of ferroelectricity in the NBT host can be applied to developing non-contact optical temperature sensitive materials and other future novel optoelectronic devices.