A modified method to synthesize the new laser upconversion material Ba2ErCl7 using Er2O3, BaCl2·2H2O and NH4Cl is reported for the first time in this paper. Single crystals up to 5-8 mm in diameter and 10-20 mm in length have been grown by Czochralski method. The transmittance spectra of Ba2ErCl7 single crystal has first been measured by using an HITACHI U-3500 spectrophotometer. There are three intense absorption peaks 4I9/2, 4I11/2 and 4I13/2 in the infrared range which can be excited by 803 nm, 980 nm and 1.5 μm laser diodes (LDs), respectively. The cut-off wavelength of the crystal is 230 nm. Intense green luminescence can be observed when the crystal is pumped by a LD at 803 nm. The formation of the defects is also discussed.