A flat panel display utilizes an array of eletroluminescent cells in which the active layer is of polycrystalline zinc sulfide that is the host for molecules of a ternary europium fluoride compound, advantageously lithium europium tetrafluoride. Each cell includes a pair of electrodes between which are...http://www.google.se/patents/US5286517?utm_source=gb-gplus-sharePatent US5286517 - A process for making an electroluminescent cell using a ZnS host including molecules of a ternary europium tetrafluoride compound
