TFEL device with injection layer

Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type

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313506, 428917, H01J 162, H01J 6304

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active

055811507

ABSTRACT:
A TFEL structure is disclosed that includes first and second electrode layers sandwiching a TFEL stack including at least one insulator layer and a novel three layer laminate structure. The three-layer laminate structure includes an alkaline earth thiogallate phosphor layer, a nucleating layer and an injection layer. The nucleating layer lies between the phosphor layer and the injection layer. The injection layer provides a charge injection function through the nucleating layer for the thiogallate phosphor layer which is of high crystallinity at its interface with the nucleating layer. A preferred injection layer includes indium, for example as the metal or as indium tin oxide. The best material for the nucleating layer is zinc sulfide.

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Modification of Dielectric-Phosphor Interface in A.C. Thin Film Electroluminescent Display Devices, Britton et al., published at least as early as Oct. 13, 1994, pp. 286-291.
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Electrical characterization of blue electroluminescent devices, Pham et al., "Advanced Flat Panel Display Technologies," SPIE 2174, 1994, pp. 190-199.

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