Optical and Electro Multifunctional Ferroelectrics: Pr Doped SrBi2Ta2O9

• 作 者: Dengfeng Peng Hua Zou Xusheng Wang Xi Yao
• 机 构: Functional Materials Research Laboratory,Tongji University,1239 Siping Road,Shanghai 200092,China;Na
• 出 处: 第十四届全国电介质物理、材料与应用学术会议
• 发表日期: 2012年9期

　　Ferroelectrics with optical and electro multifunction have great potential applications in future optoelectronic devices.Doping is as widely applied technological process in materials science that involves incorporating atoms or ions of appropriate elements into host lattices to yield hybrid materials with desirable properties and functions.For ferroelectric materials,doping is usually applied to modify electronic properties,modulating dielectric,ferroelectric,as well as piezoelectric properties.Here,we examine the Pr3+ doped SrBi2Ta2O9 (SBT) bismuth layered ferroelectrics and demonstrate that a certain amount of Pr 3+ doped ceramic sample shows a red photoluminescence with blue excitation while simultaneously keeping a strong ferroelectric characteristics at room temperature.Photoluminescence excitation spectra show that the samples have broad blue excitation band.Upon this blue excitation the samples shows a red emission,corresponding to 1D2→3H4 transition.This blue band attribute to the f-f transitions from the 3H4 ground state to the 3PJ (J=0,1,2) excited states of Pr3+.The red emission excited under blue wavelength which covers the emission wavelength of the commercial blue LED chips,meaning that Pr doped SBT can be used as environmental friendly phosphors without using toxic mercury lamp (ultraviolet excitation source).In addition,SBT is an intrinsic dielectric and ferroelectric material.The dielectric and ferroelectric properties were investigated in this study.As a multifunctional materials,Pr doped SBT may be useful in sensor,future optical-electro integration and coupling devices.