Abstract
Er3+ doped intergrowth Bi4Ti3O12–SrBi4Ti4O15 (BIT–SBTi: xEr3+) ceramics have been synthesized by a solid state processing. Upconversion (UC) luminescence and ferroelectric (FE) polarization properties were first investigated. Bright UC green emission, originating from (2H11/2,4S3/2)–4I15/2 transitions, was confirmed to be a two-photon energy transfer process by pumping laser power dependence of emission intensity. The UC green luminescence can be seen by the naked eye at room temperature. Furthermore, it is found that a proper Er3+ doping can also remarkably enhance the FE polarization of BIT–SBTi: xEr3+. The results indicated that BIT–SBTi: xEr3+ with good UC emission and high FE polarization can act as a potentially multifunctional optical-electro-material.
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