In this work,the Yb3+/Tm3+co-doped layered perovskite CaBi2Nb2O9 upconversion(UC)luminescent material were synthesized by the solid state method.Their crystalline structure,morphology and the UC luminescent properties were investigated through powder X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM)and spectral analysis of UC emission.Under 980 nm excitation,the CaBi2 Nb2 O9:Yb3+/Tm3+samples exhibits bright blue emission centered at 478 nm accompanied with typical weak red emission at 647 and 695 nm and near infrared(NIR)emission at 783 nm,which ascribe to1G4→3H6,1G4→3F4,3F3→3H6 and 3H4→3H6 transitions of Tm3+,respectively.Power dependence studies reveal that all the UC emissions are a two-photon process.The results indicate that CaBi2Nb2O9 is a promising candidate for UC luminescent materials.
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