Patent ID: 7888700
Filing Date: 2011-02-15
Classification: H01L,Y10S

Abstract:
1. An inorganic light emitting device comprising: a transparent substrate; a first electrode; a second electrode opposed to the first electrode; a polycrystalline inorganic light emitting layer comprising core/shell quantum dots, without organic ligands, wherein the shells completely surround each of the cores of the core/shell quantum dots such that the shell that belongs to each core completely surrounds the core and wherein the core and shell materials are selected such that the valence and conduction band levels largely confine the core holes and electrons to the core region of the quantum dot and wherein each core/shell quantum dots is greater than 2 nanometers in diameter, within a conductive inorganic semiconductor matrix composed of fused inorganic nanoparticles, wherein the inorganic nanoparticles have a different composition from that of the core/shell quantum dots, are less than 2 nanometers in diameter, and there is at least a 2:1 ratio of inorganic nanoparticles to core/shell quantum dots, and, wherein the first electrode is transparent and formed on the transparent substrate, the polycrystalline inorganic light emitting layer is formed over the first electrode, and the second electrode is formed over the light emitting layer.