| 摘要 |
Conventional light-emitting elements, in particular an organic electroluminescence devices, involve problems resulting from a low light extraction efficiency of 20% or less, because of limitations on light emission set by total reflection angle on an organic layer or transparent electrode as the component, and are demanded to have improved luminance and other optical characteristics which depend on viewing angle. The present invention provides an organic electroluminescence device which can improve a light extraction efficiency and thereby reduce operational current and power consumption by incorporating a laminate of optical thin films of low refractive index and having pores whose size is controlled at a level equivalent to or shorter than visible wavelengths, because the light components totally reflected to become wave-guided or reflected light in a common device can be extracted as light scattered by the pores.
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