Nanoparticle dispersions of ZnS doped with a luminescent center and of Cu.sub.x S are prepared together or separately by precipitation from aqueous solutions. When such dispersions are coated between conductive electrodes a Thin Film Inorganic Light Emitting Diode device is obtained.

Des dispersions de Nanoparticle de ZnS enduites d'un central luminescent et de Cu.sub.x S sont préparées ensemble ou séparément par la précipitation des solutés. Quand de telles dispersions sont enduites entre les électrodes conductrices un dispositif inorganique de diode luminescente de la couche mince est obtenu.

 
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