Patent ID: 8174188

Claim:
An ELD (electro-luminescent device) comprising an MIT (metal-insulator transition) layer, comprising: a substrate; a EL phosphor layer positioned on the substrate and comprising luminescent center ions generating light; the MIT layer disposed on one side of the EL phosphor layer and being abruptly changed from an insulator to a metal according to a variation of a voltage; a first insulator adhered to the MIT layer; and a second insulator disposed on the other side of the EL phosphor layer, wherein: a first voltage applied to the entire ELD, is dividedly applied to the first insulator, the second insulator, the MIT layer, and the EL phosphor layer; the first voltage applied to the entire ELD determines the abrupt change of the MIT layer to the metal, such that the abrupt change of the MIT layer to the metal occurs when a portion of the first voltage applied to the MIT layer is the same as or greater than V MIT which is an MIT threshold voltage at which the MIT layer is changed from an insulator to a metal; and a thickness of the MIT layer is determined so that when the portion of the first voltage applied to the MIT layer is equal to or lower than V MIT , the voltage applied to the EL phosphor layer is lower than a threshold voltage V p at which the EL phosphor layer emits light, and when the portion of the first voltage applied to MIT layer is higher than V MIT so that the MIT layer turns into a metal state, the electric field applied to the EL phosphor layer is increased to a voltage higher than the threshold voltage V p .