The Photoluminescence Properties In Sm³⁺-doped(Bi_0.5Na_0.5) TiO₃Lead-free Piezoelectric Materials

With the increasing shortage of energy, multifunctional materials have been paidmore and more attention, and have been widely used in some high-tech fields.Piezoelectric material is an indispensably important material in the field of scienceand technology, and is widely used in military, aerospace, agriculture and other fields.However, lead-based piezoelectric materials are more widely used at present. Although,its performance is superior, seriously harmful to the human living environment andpeople’s own health. In recent years, the research of lead-free piezoelectric materials isinvestigated deeply, and some achievements have been obtained. Sodium bismuthtitanate lead-free piezoelectric material is considered to replace Pb-based piezoelectricmaterials. And its photo-electric properties by doping with rare earth have someadvantages, such as high color purity, high energy conversion efficiency, longfluorescence lifetime and anti irradiation high stability. In this paper, using the traditionalhigh-temperature solid-phase method, the structure and luminescence properties ofsodium bismuth titanate materials with perovskite structure by Sm3+dopants werestudied. Its main contents include the following:The lead-free piezoelectric ceramics (Bi0.5Na0.5)1-xSmxTiO3was prepared by thetraditional high-temperature solid-phase method, and its phase structure and theluminescent properties were studied in this paper. Firstly studied the effects of theconcentration and sintering temperature of doped Sm3+on luminescent properties ofBNT:Sm3+.Found that the luminescence performance increased with the increasingconcentration of Sm3+,and there was the maximum when doping concentration x equaledto0.015, then decreased rapidly because of the concentration quenching effect. Sinteringtemperature has also a great effect on the luminescent properties. The luminous intensityof samples increased gradually with the increasing sintering temperature between900℃and1200℃, and reached the peak at1150℃,then decreased. In addition, when doping concentration x equaled to0.015, luminous intensitymaximum, the luminous performance tests of the samples were performed at differenttemperature, Found that luminescence intensity increased rapidly when the samples areheated from room temperature, and reached a maximum about160℃, then decreasedwith the increasing test temperature.According to Charge compensation principle, formed(Bi0.5Na0.5)1-2xSmxMxTiO3(M=Li+, Na+, K+) by doping alkali metal ions in the A site of BNT:Sm3+samples, theresults found that the introduction of monovalent alkali metal ions could significantlyimprove the luminous intensity of the samples, which increased maximum K+ions.This paper also studies that the effect of the concentration of Bi and after doped Zr4+replacing Ti4+in B size on luminescent properties of lead-free piezoelectric ceramics ofSodium bismuth titanate based. Found that besides the regularity in the show, thefluorescence emission intensity of the samples had only affected, and luminescencedistribution of BNT:Sm3+had not effected by above all the substitution, which stillmaintain the three strong emission peak.