The growth of LiNbO3 single crystal with Er3 + and Zn2 + co-doped using Bridgman method and its characteristicabsorption spectra and fluorescence spectra were reported. Large-size crystals initially containing Zn2+ (3%) and Er3+diffraction and differential thermal analysis (DTA) were used to characterize the crystals. The results indicate that the con-centration of Er3 + ions in crystals, their absorption intensity, and their fluorescence intensity decrease from the bottom to thetop in the crystals. However, for the upper part of the crystal, the up-conversion fluorescence intensity is higher than that ofthe lower part excited by an 800 or 970 nm pump. The effects of the crystal lattice, their structural defect and their effectivesegregation of Er3 + ions were discussed with respect to the variations of the up-conversion fluorescence intensity.
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