Organic electroluminescence device, planar light source and display device using the same

Abstract

An organic EL cell is formed to satisfy the expression (1): B0<Bθ in which B0 is a normal luminance intensity of luminescence radiated from a light extraction surface to an observer side, and Bθ is a luminance intensity of the luminescence at an angle of 50° to 70°. A region for disturbing an angle of reflection/refraction of light is provided in an optical path in which the luminescence is output from said emitting layer to the observer side through said transparent electrode. As the region, an anisotropic scattering resin layer containing a light-transmissive resin, and micro domains dispersed/distributed in the light-transmissive resin and different in birefringence characteristic may be formed substantially without interposition of any air layer in an optical path in which the luminescence is output from the emitting layer to the observer side through the transparent electrode. At least one kind of luminescent material is contained in the anisotropic scattering resin layer or between the anisotropic scattering resin layer and the emitting layer so that the luminescent material generates fluorescence or phosphorescence when the luminescent material absorbs the luminescence radiated from the emitting layer as an excitation light source.

Dependencies are inferred from the claim text.