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US 5,314,759 AGranted
Phosphor layer of an electroluminescent component
AssigneePlanar International Oy
InventorsGitte Harkonen, Kari Harkonen, Runar Tornquist
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AssigneePlanar International Oy
InventorsGitte Harkonen, Kari Harkonen, Runar Tornquist
Estimating the term…
The present invention relates to a multilayer phosphor layer system for an electroluminescent display. The phosphor layer according to the invention is comprised of several superimposed host matrix material layers (7) and interposed activator-containing doping layers (9, 10). The activator-containing doping layers (9, 10) are extremely thin, whereby disturbance to crystal growth of the host matrix material at the doping layer (9, 10) is avoided. The activator-containing doping layer (9, 10) can be comprised of an actual activator layer (10) and a matching layer (9) adapted between said host matrix material layer (7) and said actual activator layer (10), whereby said matching layer (9) improves the matching between said host matrix material layer (7) and said actual activator layer (10). By virtue of the layered structure, it is possible to use such host matrix/activator material pairs that otherwise would be useless due to their poor efficiency or weak light emission.
A phosphor layer of an electroluminescent component, the layer being comprised of superimposed host matrix material layers to accelerate electrons and activator-containing doping layers capable of producing light emission alternately placed between the host matrix layers, the phosphor layer comprising at least two of said host matrix material layers and at least one activator-containing doping layer, the at least one activator-containing doping layer including a matching layer having a thickness less than 10 nm, such that the at least one activator-containing doping layer matches epitaxially on the host matrix layers while essentially avoiding disturbance of the crystal structure growth of the host matrix material layers that accelerate electrons.
Dependencies are inferred from the claim text.