JP2007294438A5 - - Google Patents

Claims (15)

Which are sequentially stacked, a first electrode, an organic EL element consisting of at least an organic light-emitting layer stacked organic material layers including, and a second electrode,
A rough surface formed in contact with at least one of the first electrode or the second electrode on the outer side of at least one of the first electrode or the second electrode so as to transmit light emitted from the organic light emitting layer. Having a light scattering layer comprising a rough surface interface to constitute,
The organic material layer has a film thickness d satisfying a relationship of d ≧ 5 × Ra (where d is an average film thickness of the organic material layer and Ra is an average roughness of the rough surface interface). An organic EL element. The organic material layer has a film thickness d satisfying a relationship of d ≧ 10 × Ra (where d is an average film thickness of the organic material layer and Ra is an average roughness of the rough surface interface). The organic EL device according to claim 1.   3. The organic EL element according to claim 1, wherein a part or all of the organic material layer is produced by heat treatment.   3. The organic EL element according to claim 1, wherein a part or all of the organic material layer is produced by a coating method.   5. The organic EL device according to claim 1, wherein the organic material layer has at least one of a hole transport layer and an electron transport layer arranged on opposite sides with respect to the organic light emitting layer.   The organic material layer has at least one of a hole injection layer and an electron injection layer disposed outside the hole transport layer and the electron transport layer with respect to the organic light emitting layer, respectively. The organic EL element of description.   The organic EL device according to claim 1, wherein the light scattering layer has a light scattering rate of 30% or more.   The organic EL element according to claim 1, further comprising a low refractive index layer disposed outside the light scattering layer with respect to the organic material layer.   The organic EL device according to claim 8, wherein the low refractive index layer has a refractive index of 1.3 or less.   The organic EL element according to claim 8, wherein the low refractive index layer contains silica.   The organic EL device according to claim 1, further comprising a gas barrier layer disposed outside the first electrode with respect to the organic material layer.   12. The organic EL device according to claim 11, wherein the gas barrier layer is a laminate of a polymer thin film and an inorganic thin film, or a polymer thin film or an inorganic thin film.   The organic light-emitting device according to claim 1, wherein the light scattering layer is a scattering particle-containing film in which scattering particles are dispersed.   The organic EL device according to claim 13, wherein the scattering particles have a particle size of 0.1 to 1 μm. The scattering particles organic EL device according to claim 13 or 14 wherein the TiO _x.