Organoelectroluminescent element, and light emission device, display device, and illumination device in which said organoelectroluminescent element is used
摘要
說明書
In the present invention, it is preferable for a light extraction layer to be formed on the substrate because the light extraction layer will reduce guided light inside the substrate and will increase the external quantum efficiency and the power efficiency. The light extraction layer formed on the substrate may be formed on the opposite side of the substrate from the side on which the anode is formed, or it may be formed at the interface between the substrate and the anode on the same side of the substrate as the side on which the anode is formed.
Examples of light extraction layers include a light scattering layer and a prism sheet. In concrete terms, a light scattering layer is a polymer layer composed of titanium dioxide, silica, or another such inorganic material, or polystyrene, PMMA, or another such organic material, and in which microparticles (from a few nanometers to a few microns in size) are dispersed, while a prism sheet is in the form of a triangular pyramid composed of an organic material formed by printing (such as screen printing), embossing, light patterning, nanoimprinting, or the like.
These layers can be formed directly on the substrate, or by forming them on a film and then transferring them to the substrate, or by bonding a film to the substrate, or another such method. Moreover, these layers may be formed either at the interface between the substrate and the air or at the interface between the substrate and a transparent electrode (the anode), or at both locations.
In addition, either a prism sheet or a light scattering layer may be used, or both may be used in combination.
The thickness of the light extraction layer is preferably 0.01 to 10 μm, more preferably 0.1 to 5 μm, and even more preferably 0.5 to 3 μm.
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