Patent ID: 8377343

Claim:
An optical function layer, comprising a function coating in the form of crystalline ZnO x S 1−x with x values from the range of x=0.4 to x=0.8, wherein the function coating exhibits a crystal structure of wurtzite and a band gap in the range between about 2.5 eV and 2.9 eV, wherein the function layer is prepared by a thin-film deposition by sputtering procedure: ZnS being the target; an Ar gas flow of 4.2 sccm at an Ar pressure of about 2.0 pa; an O 2 gas flow of 0.9 sccm; a sputtering power of about 300 w at a target to a substrate voltage of about 3-3.5 kv; a substrate temperature of about 300° C. to 360° C.; and a chamber pressure of 4 mpa.