Method for preparing a multilayer structure for electroluminescent components
First Claim
1. A method for preparing a planar multilayer structure, said method comprisingdepositing said multilayer structure comprising at least one phosphor layer and at least one dielectric layer onto a suitable substrate, said phosphor layer comprising at least one alkaline-earth metal sulfide and said dielectric layer comprising at least one metal oxide species, anddepositing at least one of the dielectric layers by means of surface reactions directly onto said alkaline-earth sulfide layer,whereinthe dielectric layer deposited onto said alkaline-earth sulfide layer is at least partially deposited from a precursor of vaporizable organometal complex containing at least one metal atom and at least one organic ligand bonded to said at least one metal atom via an oxygen atom, whereby an electroluminescent structure is achieved exhibiting a luminance better than 80% of an initial luminance value after 800 operating hours.
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Abstract
The present publication discloses a method for fabricating a multilayer alkaline-earth sulfide-metal oxide structure particularly suited for use in electroluminescent components. According to the method, a multilayer structure comprising at least one phosphor layer and at least one dielectric layer is formed onto a suitable substrate. The phosphor layer comprises at least one alkaline-earth sulfide and the dielectric layer at least one metal oxide. At least one of the dielectric layers is deposited by means of surface reactions directly onto the alkaline-earth sulfide layer(s). The invention is based on depositing the metal oxide dielectric layer by using as the precursor a organometal complex not involving compounds which could react in a deleterious manner with the alkaline-earth sulfide layer. This approach results in an EL component structure of longer life than those of the prior art.
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Citations
25 Claims
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1. A method for preparing a planar multilayer structure, said method comprising
depositing said multilayer structure comprising at least one phosphor layer and at least one dielectric layer onto a suitable substrate, said phosphor layer comprising at least one alkaline-earth metal sulfide and said dielectric layer comprising at least one metal oxide species, and depositing at least one of the dielectric layers by means of surface reactions directly onto said alkaline-earth sulfide layer, wherein the dielectric layer deposited onto said alkaline-earth sulfide layer is at least partially deposited from a precursor of vaporizable organometal complex containing at least one metal atom and at least one organic ligand bonded to said at least one metal atom via an oxygen atom, whereby an electroluminescent structure is achieved exhibiting a luminance better than 80% of an initial luminance value after 800 operating hours.
Specification