Undoped and rare-earth-doped bismuth silicate (BSO) crystals were grown in the same condition by modified Bridgman method. UV exited luminescence, thermoluminescence (TL) glow curves were investigated. The emission spectra of BSO crystals doped with Ce, Y, Gd, Yb ions respectively are similar to that of undoped crystal, but the emission spectra of BSO crystals doped with Dy and Eu respectively differ greatly from that of undoped crystal, and especially, the emission intensity of BSO:Dy is much more than that of undoped crystal. TL glow curves of BSO crystals coped with Y, Gd, Yb are similar to each other, but differ greatly from that of BSO crystals doped with Dy and Y respectively. Dy and Eu ions replace some Bi ions in BSO crystals and become new luminescence centers. Because Dy ions can boost up the luminescence intensity of BSO crystal, BSO:Dy can be a potential excellent scintillator.

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