Optical ZnS Material and Preparation Method Thereof

A method for preparing an optical ZnS material, comprising:

• charging a zinc raw material and a sulfur raw material into a first crucible and a feeding device of a chemical vapor deposition furnace respectively, wherein the feeding device is in communication with a second crucible of the chemical vapor deposition furnace, and the first crucible and the second crucible are located in different furnace bodies of the chemical vapor deposition furnace;
• heating the first crucible, the second crucible and a deposition chamber of the chemical vapor deposition furnace, and charging the sulfur into the second crucible through the feeding device after the first crucible is heated to 560-640° C., the second crucible is heated to 230-290° C. and the deposition chamber is heated to 560-640° C.;
• and
• introducing an inert carrier gas into the first crucible and a mixed gas of an inert carrier gas and hydrogen into the second crucible after the zinc and the sulfur are melted, flowing the carrier gases containing a zinc vapor and a sulfur vapor respectively into the deposition chamber through pipelines to deposit ZnS on a deposition substrate in the deposition chamber, and supplying the sulfur to the second crucible through the feeding device during the deposition process regularly and quantitatively, to maintain a saturated vapor pressure of sulfur in a range of 0.8 to 1.8 KPa.