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Improving the Light Out-Coupling Properties of Inorganic Thin-Film Electroluminescent Devices

The light out-coupling properties of inorganic thin-film electroluminescent devices can be improved by using a new device structure with a light-scattering layer. This consists of particles dispersed in a binder and it can be laminated on the surface of conventional devices by screen-printing. The light-scattering layer increases the luminance to approximately three times that of conventional devices and reduces the viewing-angle dependence of the electroluminescent spectrum.