Abstract
Upconversion (UC) luminescence and ferroelectric (FE) polarization properties were first investigated in polycrystalline Er3+-doped SrBi2Nb2O9 (SBN:xEr3+) samples. Bright UC green and weak UC red emission, originating from (2H11/2, 4S3/2)–4I15/2 and 4F9/2–4I15/2 transitions, respectively, was confirmed to be a two-photon energy transfer process. The UC green luminescence can be seen by the naked eye at room temperature. The optimal UC green emission was obtained when x=5mol.% in SBN:xEr3+. Furthermore, it is surprisingly found that a proper Er3+ doping can also remarkably enhance the FE polarization of SBN:xEr3+.
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