Fabrication of Dispersion-type Inorganic Electroluminescence Panel Using Planar Electrodes

In dispersion-type inorganic electroluminescence (EL) devices, a high-voltage drive is required to achieve high luminescence, as the thickness of the phosphor layer is 20 μm or more. Transparent electrodes such as indium tin oxide (ITO) are required, because light emission from the phosphor layer is necessary. To solve these issues, we developed a circular comb-type metal electrode with several narrow gaps on a glass substrate that produces a strong electric field, which is impossible to achieve with conventional structures. A comb-type metal (Au) electrode and a comb-type ITO electrode were used in the experiments. The luminance from the phosphor layer side at 30 V/μm was 26.9 cd/m for the Au electrode, which was twice that for the ITO electrode (19.9 cd/m). Thus, it is possible to fabricate a light-emitting device without transmissive electrodes by using a lustrous metallic material such as Au with a circular comb-type design.