Patent ID: 6706551
Filing Date: 2004-03-16
Classification: B82Y,C01G,C01P,C09C,C09K,H01L

Abstract:
A method for manufacturing a Thin Film Inorganic Light Emitting Diode device, said method comprising the following steps, in order:(1) preparing a nanoparticle dispersion of ZnS doped with a luminescent centre by precipitation from appropriate aqueous solutions comprising zinc ions, sulfide ions and dopant ions, (2) washing said dispersion of doped ZnS to remove non-precipitated ions, either, (3) mixing said washed dispersion of doped ZnS (n-type semiconductor) with a water-compatible p-type semiconductive polymer, (4) coating said mixture, optionally after admixture with a binder, onto a first conductive electrode, (5) applying on top of said coated layer resulting from step (4) a second conductive electrode, with the proviso that at least one of said first and second electrode is transparent, or, (3â€²) coating on top of a first conductive electrode a double layer pack comprising, in either order, (3â€²a) a layer containing a water-compatible p-type semiconductive polymer, and, (3â€²b) a layer containing said washed dispersion of doped ZnS, optionally admixed with a binder, (4â€²) applying on top of said coated layer pack resulting from step (3â€²) a second conductive electrode, with the proviso that at least one of said first and second conductive electrode is transparent, thereby resulting in said Thin Film Inorganic Light Emitting Diode device.