Manufacturing of a thin inorganic light emitting diode

A method for manufacturing a Thin Film Inorganic Light Emitting Diode device, said method comprising following steps:

• either,
• (1) preparing a nanoparticle dispersion comprising together ZnS doped with a luminescent center (n-type semiconductor) and CuxS (p-type semiconductor) by precipitation from appropriate aqueous solutions of the respective ions,
• (1′) preparing a first separate nanoparticle dispersion of ZnS doped with a luminescent center (n-type semiconductor) and a second separate nanoparticle dispersion of CuxS (p-type semiconductor), both by precipitation from appropriate aqueous solutions of the respective ions,
• (2) washing the dispersion prepared according to (1) or both dispersions prepared according to (1′) to remove non-precipitated ions,
• (3) coating onto a first conductive electrode the dispersion resulting from steps (1) and (2), or a mixture of the dispersions resulting from steps (1′) and (2) in one and the same layer, or the separate dispersions resulting from steps (1′) and (2) in two separate layers,
• (4) applying on top of said coated layer(s) resulting from step (3) a second conductive electrode, with the proviso that at least one of said first and second electrodes is transparent.