Patent ID: 7521670

Claim:
A standard for referencing luminescence signals, comprising an optically transparent base material, said base material being a lanthanum phosphate glass; said base material further comprising a bulk doping with at least one luminescent component selected from the group formed by a rare earth and a nonferrous metal, wherein said bulk doping comprises at least one component selected from the group formed by cobalt, chromium and manganese; and further wherein said base material is a lanthanum phosphate glass comprising (in wt.-% based on oxide content): P 2 O 5 30 to 90 La 2 O 3 more than 0 up to 30 Al 2 O 3 0 to 20 R 2 O 1 to 20 refining agents 0 to 3, wherein R is at least one element selected from the group formed by the alkali metals.