Cadmiumfreie optische Steilkantenfilter

Die Erfindung betrifft cadmiumfreie optische Steilkantenfilter, umfassend I-III-VI-Verbindungshalbleitersysteme mit stöchiometrischer oder nicht-stöchiometrischer Zusammensetzung, wobei die I-III-VI-Verbindungshalbleiter Systeme mit einem oder mehreren der nachfolgenden Elemente DOLLAR A für die einwertigen (I)-Elemente: Cu, Ag DOLLAR A für die dreiwertigen (III)-Elemente: Al, In, Ga DOLLAR A für die sechswertigen (VI)-Elemente: S, Se, Te DOLLAR A sind. Cadmium-free optical cut-off filter comprises a I-III-VI compound semiconductor system with a stoichiometric or non-stoichiometric composition. The monovalent (I) elements are selected from Cu and Ag. The trivalent (III) elements are selected from Al, In and Ga. The hexavalent (VI) elements are selected from S, Se and Te. An Independent claim is also included for a process for the production of the cut-off filter comprising heating a transparent substrate to 200-800, preferably 250-600 degrees C, and applying a I-III-VI compound semiconductor using a PVD or sputtering process. Preferred Features: The cut-off filter has an edge wavelength of 460-1240 nm. The transparent substrate is a glass or plastic substrate. The glass substrate is made from a titanium-doped soda lime glass.