To solve such a problem that, although the normal light emission of an EL device is performed at a part called as a light-emitting layer pinched by an indium tin oxide alloy (ITO) transparent electrode fitted on a glass substrate and its counter electrode, total reflection takes place especially at an interface between the ITO transparent electrode and the glass substrate and that between the glass substrate and outside air, since materials forming the layers are different from one another, to cause different refractive indices, and light-takeout efficiency tends to be lowered to 20 to 30%.
This device is provided with a transparent substrate 21, a counter electrode 13 arranged in opposition to the transparent substrate 21, a transparent electrode 11 arranged between the transparent substrate 21 and the counter electrode 13, and a light-emitting layer 12 arranged between the transparent electrode 11 and the counter electrode 13, and further, a first light-takeout layer 14 is arranged between the transparent electrode 11 and the transparent substrate 21. At least one lens for refracting light emitted from the light emitting layer 12 toward the transparent substrate 21 is embedded in the first light-taking-out layer 14.
ANPO TAKEO
Takao Ito
Jiro Higuchi
Tomohiro Harada