Patent ID: 7442446

Claim:
An improved phosphor film for a thick film dielectric electroluminescent display, said phosphor film selected from the group consisting of (a) a rare earth activated alkaline earth phosphor having the formula AB x C y :RE wherein; A is selected from one or more of the group consisting of Mg, Ca, Sr and Ba; B is selected from one or more of the group consisting of Al, Ga and In; C is selected from one or more of the group consisting of S and Se; and RE is a rare earth activator species; (b) a rare earth or transition metal activated zinc selenide; and (c) a rare earth or transition metal activated zinc sulfo-selenide, wherein said phosphor film of (a), (b) and (c) is provided with an aluminum nitride barrier layer on a top and/or bottom side of the phosphor film, and said aluminum nitride barrier layer has a thickness in a range of about 30 nm to about 50 nm when used in conjunction with said rare earth activated alkaline earth phosphor.