Abstract
A modified method to synthesize the new laser upconversion material Ba 2ErCl 7 using Er 2O 3, BaCl 2 ⊎2H 2O and NH 4CI is reported for the first time in this paper. Single crystals up to 5–8mm in diameter and 10–20 mm in length have been grown by Czochralski method. The transmittance spectra of Ba 2ErCl 7 single crystal has first been measured by using an HITACHI U-3500 spectrophotometer. There are three intense absorption peaks 4I 9 2 4I 11 2 and 4 I 13 2 in the infrared range which can be excited by 803nm, 980nm and 1.5μm laser diodes (LDs), respectively. The cut-off wavelength of the crystal is 230mn. Intense green luminescence can be observed when the crystal is pumped by a ED at 803nm. The formation of the defects is also discussed.
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