Patent ID: 7482066

Claim:
An organic electroluminescent (EL) display device, comprising: a light-emitting layer having an edge roughness of less than 5 μm and comprising a light-emitting polymer composition including: first and second light-emitting polymers having chemical elements, wherein: the first and second light-emitting polymers have different interfacial characteristics which lower a cohesion between the chemical elements of the first and second light-emitting polymers, and a corresponding wavelength spectrum of the first light-emitting polymer overlaps a corresponding wavelength spectrum of the second light-emitting polymer, so as to allow an energy transfer in the light-emitting polymer composition; and an additive which improves adhesion of the light-emitting polymer composition to a substrate and lowers the cohesion between the chemical elements of the first and second light-emitting polymers, wherein the additive is a small molecular material having a carrier transporting ability, and the small molecular material having the carrier transporting ability is one of a hydrazone, a carbazole, a stilbene, and a starburst group.