The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1987
Filed:
Mar. 27, 1986
Donald H Baird, Newton, MA (US);
Martin S McDonough, deceased, late of Andover, MA (US);
GTE Laboratories Incorporated, Waltham, MA (US);
Abstract
Method of producing a thin film electroluminescent device by sputtering a first transparent electrode of indium tin oxide or tin oxide onto a glass substrate, sputtering a layer of insulating material, for example barium tantalate, over the transparent electrode, and then forming a phosphor layer of zinc sulfide with manganese as an activator on the layer of insulating material. To form the phosphor layer electrical energy is applied to a target containing elemental zinc in an atmosphere containing hydrogen sulfide and argon to cause sputtering therefrom. Elemental zinc reacts with the hydrogen sulfide to deposit a layer of zinc sulfide over the layer of insulating material. The manganese is cosputtered either from a separate target or from a single target incorporating both zinc and manganese.